Organic vegetable farmers execute weed management using many overall philosophies, including focusing management during the early-season critical period, managing the weed seedbank with a ‘zero seed rain’ strategy, or physically suppressing weeds with plastic or natural mulches. While these strategies vary in their ecological and economic implications, farmers’ reasons for adopting specific weed management approaches, and the related practical implications of each approach remain unclear. To better understand farmer motivations and ecological impacts of broad weed management philosophies, we conducted case studies of four successful organic vegetable farmers with specialization in different management approaches. The farmers were interviewed about their experiences and soil samples were collected for weed community and soil organic matter (SOM) analysis. The farmer who controls weed seedlings primarily during the critical period has appreciated the associated weeding labor savings, but late-season weeds have contributed to a large weed seedbank (38,482 seeds m−2), which is necessitating a change in his management. Conversely, the zero seed rain strategy of another farmer required a large amount of labor in the initial years, but weeding labor requirements have lessened every year due to decreased weed emergence from his diminishing weed seedbank (3065 seeds m−2). Another farmer utilizes plastic mulch in many crops in order to reduce weeding labor during the busy spring planting season. Finally, the farmer that uses natural mulches has high labor costs, but they are offset by the benefits of weed suppression, soil moisture conservation and increases to SOM. The two farmers utilizing mulch had the greatest portion of monocotyledonous weeds, perhaps relating to their morphology allowing them to emerge through the mulch. In ranking management criteria based on their importance, the case study farmers generally valued the criteria that are benefited by their strategy, indicating a strong relationship between their priorities and their management. Overall, there was no ‘best’ weed management strategy, but farmers may benefit from the consideration of how their management priorities match the practical tradeoffs of each strategy.

It is accepted generally that anaerobic digesters (AD) are efficacious technologies for reducing greenhouse gas emissions from livestock operations (Pronto and Gooch, 2009). In addition, AD technology has a number of other potential benefits including: energy production for use on the farm and for sale, separation of manure solids for ease of use or export off-farm, pathogen reduction leading to healthier labor and herd outcomes and odor control. It is also clear that in the USA, research and extension efforts, including public financing of AD technology installations, have disproportionally been focused on larger farms- e.g., dairy farms with at least 500 milking cows. The latter has begun to change as more resources are being invested in AD technology for smaller livestock farms. We present the results of a pre and post survey implemented at four workshops on small-scale AD technology for livestock farmers in northeastern New York State. Results indicate that information presented shifted farmers’ attitudes such that they viewed AD technology as not overly complex; and, they became less interested in selling generated surplus power off-farm.

Intermediated markets account for two-thirds of local sales and are slowly gaining more attention. These marketing channels generally include all opportunities in the local supply chain that are not direct-to-consumer transactions, including sales to grocery stores, restaurants, regional aggregators such as food hubs, as well as schools, universities, hospitals and other institutions. The marketing chains are often regionally based and are shorter than the typical conventional food supply chain. These markets, like all other marketing opportunities, have their advantages and challenges for farmers. A set of nine papers in this themed issue explores a range of aspects of intermediated market channels, with some papers taking a broad view and others examining how farmers navigate specific markets. Together, the papers point to the potential that intermediated markets offer farmers interested in marketing their products locally and regionally, as well as reveal the entrepreneurial spirit that some of these market channels embody. While growth has been substantial and some successes evident, the papers also point to the challenges facing farmers who are trying to improve the economic situation of their farms.

A vast amount of agricultural land in the USA will change hands in the coming years as established farmers age and transition out of farm ownership. As a result, beginning farmers are likely to continue to face numerous obstacles as they try to find and purchase the property. Two of the greatest barriers include the high price that farm property usually commands and the steady conversion of farmland to non-agricultural uses (e.g., suburban development). Non-profit organizations and government agencies have used conservation easements extensively to protect against conversion of agricultural land, but, too often, that does not ensure affordability for beginning farmers. Accordingly, advocates have developed supplemental land transfer tools intended to enhance conservation easements and help beginning farmers gain access to land. In this exploratory research, we look at two of these novel tools, namely Conservation Buyer Programs (CBPs) and the option to purchase at agricultural value (OPAV). Specifically, we present case studies about two entities that use OPAV and two that use CBPs in order to understand how these tools function and whether they improve land access for beginning farmers. Interviews with professionals and beginning farmers who have worked with these tools in four states inform our analysis and add depth to previous scholarship. We found that OPAV and CBPs can improve access to agricultural land for beginning farmers under certain circumstances. These tools, however, are not panaceas to the challenge land affordability presents, nor are they the only tools used by the entities we studied. CBPs alone have rarely been used to help new farmers; yet, they have been paired effectively with a conservation easement and OPAV. Additionally, we found a similar tool, the simultaneous sale, has been quite effective when paired with OPAV, and less costly than the traditional conservation buyer approach. All of these tools expand the land access toolbox in important ways, but given the paucity of existing scholarship on this topic, additional research is needed. Practitioners and researchers must think critically about whether these tools are the most effective instruments to employ in the effort to get beginning farmers on the land.

Cover crops can offer erosion protection as well as soil and environmental quality benefits. Cereal rye (Secale cereale L.) is the most commonly used winter cover crop in corn–soybean rotations in the upper Midwest of the USA because of its superior winter hardiness and growth at cool temperatures. Cereal rye cover crops, however, can occasionally have negative impacts on the yield of a following corn crop, which discourages broader adoption and introduces substantial risk for corn farmers employing cover crops. We hypothesized that because cereal rye shares some pathogens with corn, it may be causing increased disease in corn seedlings planted soon after cereal rye termination. To test this, we performed a series of experiments in a controlled environment chamber to assess the response of corn seedlings with and without a commercial fungicide seed treatment to the presence of cereal rye or other species of cover crops that were terminated with herbicide prior to corn planting. Our results indicate that under cool and wet conditions, cereal rye reduces corn seedling growth performance and increases incidence of corn seedling root disease. Fungicide seed treatment had limited efficacy in preventing these effects, perhaps because environmental conditions were set to be very conducive for disease development. However, hairy vetch (Vicia villosa Roth) and winter canola (Brassica napus L.) cover crops had fewer negative impacts on corn seedlings compared with cereal rye. Thus, to expand the practice of cover cropping before corn, it should become a research priority to develop alternative management practices to reduce the risk of corn seedling root infection following cereal rye cover crops. Over the longer term, testing, selection and breeding efforts should identify potential cover crop species or genotypes that are able to match the winter hardiness, growth at cool temperatures and the conservation and environmental quality benefits of cereal rye, while avoiding the potential for negative impacts on corn seedlings when environmental conditions are suitable for disease development.

Consumer interest in locally grown produce continues to increase in the USA. Small, diversified vegetable farms, including those managed organically, have been important contributors to meet this growing demand for local product. To be profitable in these markets, farmers must be able to appropriately price their products to cover production costs and provide themselves and their employees a living wage. Questions remain, however, as to the most effective method of assessing the cost of production of specific crops on these farms, in part due to the variability in labor inputs associated with diversified farming strategies. This study used a participatory approach to investigate both methodologies for varied widely, with high coefficients of variation calculated for all values, indicating high farm-to-farm variability in labor required for seasonal activities. Farmers reported both challenges with data collection, as well as successes in using data analysis to guide management decisions. This ongoing work highlights the value of collecting farm-specific data for use in cost-of-production determinations.

In the conventional cropping systems, increased costs and resource pollution are attributed to the intensive use of chemical inputs. The adoption of cover crops could be a part of a suitable strategy for improving the sustainability of the agro-ecosystems due to their ability to affect nutrient and weed management. A 2-yr field experiments were conducted in Gorgan, North of Iran, with the aim of assessing the effect of cover crop residue management and herbicide rates on weed management and the yield of tomato crop. The treatments consisted in: (a) three winter soil management: two cover crops [annual medic (Medicago scutellata L.) and barley (Hordeum vulgare L.)] and no covered soil; (b) two soil tillage (no-tillage, where cover crop residues were left in strips on the soil surface, and conventional tillage, where cover crop residues were green manured at 30 cm of soil depth); and (c) three pre-emergence herbicide rates (no-herbicide application, half rate recommended or full rate recommended ). Cover crops were sown in early September and mechanically suppressed in March about 2 weeks before tomato transplanting. At cover crop suppression, annual medic showed the highest aboveground biomass [569 g m−2 of dry matter (DM)], while barley showed the lowest weed content (32 g m−2 of DM). At tomato harvesting, weed density and aboveground biomass ranged from 6.9 to 61.5 plants m−2 and from 33.6 and 1157.0 g m−2 of DM, respectively. Cover crop residues placed on soil surface suppressed weeds more effectively than incorporated residues, especially in barley, mainly due to the physical barrier of residues which reduced the stimulation of weed germination and establishment. As expected, herbicide rate decreased both weed density and biomass, even if the adoption of annual medic and barley cover crops before the tomato cultivation could allow a possible reduction of herbicide rate while maintaining similar fruit yield. Tomato yield was higher in annual medic than barley and no cover regardless of tillage management (on average 62.3, 51.8 and 50.1 t ha−1 of fresh matter, respectively) probably due to an abundant availability of soil nitrogen throughout the tomato cultivation. This was confirmed by high and constant values of tomato N status grown in annual medic and evaluated using SPAD chlorophyll meter. Although further research of cover crop residue management is required to obtain a better understanding on herbicide rate reduction, these preliminary results could be extended to other vegetable crops which have similar requirements of tomato.

Climate variability and declining soil fertility pose a major threat to sustainable agronomic and economic growth in Zambia. The objective of this study was to assess crop yield, land and labor productivity of conservation agriculture (CA) technologies in Eastern Zambia. On-farm trials were run from 2012–2015 and farmers were replicates of a randomized complete block design. The trials compared three CA systems against a conventional practice. Yield and net return ha−1 were determined for maize and legume yield (kg ha−1) produced by ridge and furrow tillage, CA dibble stick planting, CA animal traction ripping and direct seeding. The dibble stick, ripline and direct seeding CA systems had 6–18, 12–28 and 8–9% greater maize yield relative to the conventional tillage system, respectively. Rotation of maize with cowpea and soybean significantly increased maize yields in all CA systems. Intercropping maize with cowpea increased land productivity (e.g., the land equivalent ratio for four seasons was 2.01) compared with full rotations under CA. Maize/cowpea intercropping in dibble stick CA produced the greatest net returns (US$312-767 ha−1) compared with dibble stick maize-cowpea rotation (US$204-657), dibble stick maize monoculture (US$108-584) and the conventional practice (US$64-516). The net-return for the animal traction CA systems showed that maize-soybean rotations using the ripper were more profitable than the direct seeder or conventional ridge and furrow systems. Agronomic and economic benefits of CA-based cropping systems highlight the good potential for improved food security and agricultural productivity for smallholder farmers.

A common critique of organic farming is that it is very tillage intensive, and therefore deleterious to soil quality. However, little information is available on the tillage practices currently employed by organic farmers, as well as organic farmers’ attitudes toward reduced tillage (RT). To address these knowledge gaps, a detailed written survey of Michigan organic field crop and vegetable farmers was conducted to investigate their current tillage practices, as well as their perceptions of the barriers and benefits to adoption of RT. Respondents reported a wide range in tillage frequency and intensity, both across and within production of specific crops, with operations split evenly between field preparation and cultivation. Compared with field crop growers, vegetable growers were generally smaller scale and relied more heavily on a limited set of tillage (e.g., rototiller) and cultivation tools. Interest in adoption of RT practices among respondents was low to moderate with median Likert scale ratings (0–7 scale with 0 representing no interest and 7 extreme interest) of 4 or less for all forms of RT. Vegetable growers were most interested in permanent beds, rotational tillage and strip tillage, whereas field crop growers were most interested in rotational tillage and strip tillage. The greatest perceived benefits to adoption of RT were improved soil quality and fuel savings. Both groups ranked weeds, impacts on yields, residue management and crop establishment as high barriers to RT adoption. Vegetable growers also cited lack of scale appropriate equipment as a major barrier. Survey results suggest that future research efforts should focus on overcoming key barriers to adoption, such as weed management and access to low-cost adaptable RT equipment rather than reiterating relatively well-known soil quality benefits. Our results also suggest that promotion of incremental reductions in the frequency and intensity of tillage operations on organic farms may be more realistic and equally valuable compared with promotion of more extreme forms of RT such as no-till.

Intermediated markets are relatively new market channels that have the potential to expand local and regional food systems while increasing the viability of small- and medium-sized farms. The intermediated channels comprise a short supply chain linking farmers with consumers through the use of intermediary such as a distributor or supermarket. In many instances, these supply chains embed social or environmental values, such as supporting local farming. In this paper, we examine the current state of knowledge about the intermediated market channel. The first source of knowledge consists of data from federal and private sources. Next, we review a selection of the published literature focusing on farmer use of intermediated market channels in the USA. The main intermediated channels include direct to institutions, such as schools and hospitals; food hubs; and direct to retail. The paper finishes by raising questions about future of intermediated markets, based on the findings of the literature review and data.

One of the greatest challenges in crop science worldwide is to generate a balance between crop production and environmental preservation. Agroforestry systems present promising strategies for balancing environmental health and crop production. The aim of this study was to evaluate yield components and the juice quality of five sugarcane crop years cultivated in the understory of Aleurites fordii, in two intercropping systems and a monocropping system. A field experiment was conducted from November 2011 to June 2016 in the city of Frederico Westphalen—Rio Grande do Sul, Brazil. Information generated in this study confirms the viability of the cultivation of sugarcane in agroforestry systems, and provides information for farmers which can be used to assist in the planning of more ideal agroforestry arrangements. Agroforestry systems should consider the benefits of both forest and cultivated plant species. In this study, A. fordii trees had greater growth in the intercrop II system; however, this system promoted reductions in sugarcane yield components due to the lowest relative amount of solar radiation intercepted by sugarcane plants. For sugarcane production, the use of an intercropping system with 12 × 12 m2 arrangements should be prioritized, because it promotes greater sugarcane yields when compared with 6 × 6 m2 intercropping systems; however, significant differences were not observed when the system (12 × 12 m2) was compared with the monocropping system for most of the analyzed variables. This study sought to provide new sustainable alternatives for farmers in order to increase the diversification of rural properties and maintain the preservation of existing agroecosystems.

Opportunities for alternative swine production and marketing are emerging across the value chain. Given the developing nature of the differentiated pork industry, measurements of niche performance and success are not yet fully known. For this reason, the objectives of this study were to determine performance metrics across all major life phases for niche pork production and compare such metrics with national averages of conventional commodity pork production. Additionally, this study aimed to quantify producers’ reasoning and barriers to successfully raising niche swine. Niche meat producers in the USA self-identified for this study (n = 176); their swine production had alternative characteristics that included small- to mid-sized farms, farrow-to-finish operations, heritage breeds, housing with bedding and outdoor or pasture access, no use of antibiotics (sub-therapeutic for growth promotion or no antibiotics ever), vegetarian feed, diverse agricultural enterprises and alternative marketing avenues. This study focused on the metric categories regarding reproduction, mortality, culling and growth characteristics. The niche system produced approximately 15% fewer weaned piglets per bred sow per year than the conventional system due to fewer breeding cycles, smaller litters and higher piglet mortality in alternative production. Similarly, niche production finished 12% fewer hogs per bred sow per year than conventional production. Regarding age benchmarks of finishing and breeding, the niche system averaged 18 additional days to finish hogs at a standardized market weight of 124 kg. Likewise, niche production gilts were first bred at 283 days, whereas conventional production breeds gilts at 225 days. All directly comparable metrics were found to be statistically significant with 95% confidence for the one-sample test of means. Regarding farmer attitudes toward niche pork, survey participants shared personal reasons for raising swine and barriers to successful niche production. Choosing niche over commodity swine, participants’ reasons were grouped into three intra-related categories: (1) farm and producer viability, (2) animal and environmental welfare, and (3) consumer preference and taste. Despite these benefits, participants were faced with numerous challenges, which were organized into four intra-related categories: (1) alternative production requirements, restrictions and knowledge; (2) access and affordability of credit and inputs; (3) alternative supply chain for processing, marketing and customers; and (4) non-niche production competition and governmental policies. In sum, the success of these niche pork operations equates to high welfare for the pigs, economic viability for the operation, personal enjoyment for the farmer, customer satisfaction with meat flavor and quality, and responsible environmental practices, inclusive of many components of an alternative food system.

In this paper, we assess whether or not organic agriculture has a positive impact on local economies. We first identify organic agriculture hotspots (clusters of counties with positively correlated high numbers of organic operations) using spatial statistics. Then, we estimate a treatment effects model that classifies a county's membership in an organic hotspot as an endogenous treatment variable. By modeling what a hotspot county's economic indicators would have been had the county not been part of a hotspot, this model captures the effect of being in a hotspot on a county's economic indicators. We perform the same analysis for general agricultural farm hotspots to confirm that the benefits associated with organic production hotspots are, in fact, due to the organic component. Our results show that organic hotspot membership leads to a lower county-level poverty rate and a higher median household income. A similar result is not found when investigating the impact of general agriculture hotspots. On the other hand, our result is robust to alternative hotspot definitions based on type of organic operations to alternative methods of estimating average treatment effects on the treated. These results provide strong motivation for considering hotspots of organic handling operations, which refers to middlemen such as processors, wholesalers and brokers, and hotspots of organic production to be local economic development tools, and may be of interest to policymakers whose objective is to promote rural development. Our results may incentivize policymakers to specifically focus on organic development, rather than the more general development of agriculture, as a means to promote economic growth in rural areas, and may further point them in the direction of not only encouraging the presence of organic operations, but of fostering the development of clusters or hotspots of these operations.

Multi-stakeholder initiatives (MSIs) have emerged as a leading institutional approach for advancing sustainability globally. This paper examines three prominent MSIs that have developed sustainability metrics and a standard for US agriculture: Field to Market, the Stewardship Index for Specialty Crops and the National Sustainable Agricultural Standard Initiative. Using data from interviews and content analysis of initiative reports, two sets of analyses are presented. First, building on Paul Thompson's tri-partite theorization of sustainability, how each initiative is conceptualizing agricultural sustainability is analyzed. We find that two contrasting visions of sustainable agriculture for the USA have emerged from the three MSIs. One vision is a resource sufficiency approach focused on eco-efficiencies and the other vision is a functional integrity approach that emphasizes the maintenance of resilient agricultural and ecological systems. Second, we examine the governance practices of the MSIs to explain why such divergent conceptualizations of sustainability have been mapped out. We find that far from being a neutral forum, the internal dynamics of MSIs often reflect and reproduce existing power relationships among stakeholders. In concluding, we suggest that incremental improvements in sustainability can be achieved using MSIs, but more transformative changes may require other forms of governance.

In most developing countries, there has been a long-standing conflict of interest between using land for agriculture and the conservation of biodiversity. This paper reports on a study of factors influencing farmers’ decisions to integrate trees into their agricultural practice. We also discuss the possibility of protecting and managing planted and naturally regenerating trees on farmland in order to restore degraded land and improve biodiversity. Data were collected from interviews with farmers in the Center-West region of Burkina Faso and analyzed using Principal Component Analysis, multiple linear regression and binary logistic regression. The results show that farmers’ decisions to incorporate trees into their farmland were mainly influenced by silvicultural knowledge and skills, participation in farmers’ groups or other social organizations with an interest in tree conservation, the social value of biodiversity in the rural landscape, and the perceived economic benefits of trees on farmland. The most important factors associated with variation in levels of motivation to conserve trees on farms included household wealth, gender, age, education level, marital status, residence status, farmland size, household size and technical support. We conclude that an agroforestry project will be more successful if the local biophysical conditions and diversity of smallholder socio-economic characteristics and their perceptions, needs and preferences are considered in its design. There is also an immediate need for coordinated development of information and training to raise local community awareness of the potential of agroforestry as well as to disseminate information about adding value to tree products in order to encourage farmers to protect on-farm trees.

In recent years, the growth in local food marketing channels has been significant. Most of the research in this field examining the economic implication of these trends has focused post-farmgate including supply chain analysis (e.g., Hardesty et al., 2014; King et al., 2010), regional economic impacts (e.g., Brown et al., 2014; Hughes et al., 2008; Jablonski et al., 2016) and consumer values and motivations that have driven demand (e.g., Costanigro, 2014; Lusk and Briggeman, 2009). To date, with the exception of a few case studies examining expenses and sales by channel assessment (LeRoux et al., 2010; Hardesty and Leff, 2010; Jablonski and Schmit, 2016) there has been little research that examines the impact on financial viability among farms selling through these markets. The goal of this paper is twofold: first, to identify the factors that have the greatest influence on the efficiency of farmers and ranchers that participate in local food systems, and second, to estimate the relationship between marketing strategy and farm financial efficiency, with a particular focus on variations across farm size. Our estimation of the stochastic production frontier suggests that scale, production enterprise specialty, market outlet choices, land ownership, and management of expenses have the greatest influence on producer financial efficiency. Our model suggests that scale has the largest impact on financial efficiency, providing evidence that, all else constant, the most important factor in the efficiency of direct market producers is scale. When profit is defined as operating profit, results indicate that marketing channel is not an important indicator of efficiency. But when profit is defined as return on assets, marketing channel is an important indicator of efficiency, albeit less than is scale. Results from this analysis indicate there are economies of scale associated with farms and ranches that sell through local and regional markets, and that scale rather than marketing channel has the largest influence on efficiency.

Recirculation of nitrogen (N) from crop residue and green-manure biomass resources may reduce the need to add new reactive N to maintain crop yield and quality. The aim of this study was to determine how different strategies for recycling residual and green-manure biomass influence yield and N concentration of the edible parts of food crops in a stockless organic cropping system. For this purpose, three biomass distribution treatments were investigated in a field experiment, based on a cropping system designed to produce both high-quality food crops and biomass resources from crop residues, cover crops and a green-manure ley. The three treatments, applied at the cropping system level, were: (1) incorporating the aboveground biomass resources in situ (IS); (2) harvesting, ensiling and redistributing the same biomass resources to the non-legume crops (biomass redistribution, BR); and (3) harvesting, ensiling and using the biomass resources as substrate for production of bio-methane via anaerobic digestion (AD) followed by distribution of the digestate as bio-fertilizer to the non-legume crops. The redistribution of ensiled (BR) and digested (AD) biomass did not increase the yield of the edible parts in winter rye (Secale cereal L.), white cabbage (Brassica oleracea L.) or red beet (Beta vulgaris L.) compared with leaving the biomass on the ground at harvest (IS). The BR treatment increased the yield of lentil intercropped with oat, compared with IS treatment in one of the two studied years. The total biomass yield of the cover crop following winter rye was significantly higher in the BR treatment than in IS in both years. The legume proportion in the green-manure ley was significantly higher in the AD and BR treatments as compared with IS in one of the experimental years. This study showed that strategic biomass redistribution has the potential to enhance biomass productivity while maintaining food crop yields, thereby enhancing whole system productivity. Biomass redistribution systems both with and without biogas digestion offer a new strategy for the development of multifunctional arable cropping systems that rely on internal nutrient cycling.

Rural communities have faced significant socio-economic challenges for the past several decades due to structural shifts and changing social expectations regarding the management, production of, and markets for natural resources, including production agriculture. The New Natural Resource Economy (NNRE) is an economic development approach to the use of natural resources, including agriculture, in ways that can build healthy environments and healthy, resilient local economies (Hibbard and Lurie, 2013). A major attribute of the NNRE is its focus on very small businesses, the predominant business type in rural settings. Emerging trends, such as regional food networks (RFNs) that connect food producers to consumers within a state or local region, may provide opportunities for rural communities to diversify and expand local businesses around the use of natural resources, thereby helping to restore greater capacity for self-direction and adding to local community vitality. Thus, we address whether RFNs in rural Oregon counties display characteristics of an NNRE development strategy through the relationships between agricultural producers and consumers that support very small agricultural enterprises. Based on analysis of Oregon producer survey data from 2016 in the more rural resource-dependent Oregon counties, we find that the RFN producer survey respondents are indeed very small businesses engaged in small-scale, multifunctional agriculture. They are motivated by economic, social, and environmental concerns as they contribute to the economic activity in their communities. We also surveyed Oregon consumers, finding that although consumer survey respondents in the same region are not primarily driven to buy local based on environmental considerations, they are nonetheless interested in supporting agriculture and local businesses. The demand for local products can create a virtuous cycle contributing to the economic, social, and environmental sustainability of the community. Given appropriate policy and program support, there is fertile ground to create new opportunities to generate farm income and acquire food within the NNRE healthy environment-healthy economy paradigm for rural economic development.

In conservation agriculture, cover crops are utilized to improve soil properties and to enhance cash crop growth. One important part of cover crop management is termination. With smaller profit margins and constraints on time and labor, producers are searching for ways to reduce time and labor required to terminate cover crops while maintaining or increasing profitability. This study examined the effect of 11 different combinations of terminating cereal rye (Secale cereale L.) and planting cotton (Gossypium hirsutum L.) on population, seed cotton yield, total costs and net returns; and how combined operations affect labor, fuel consumption and carbon (CO2) emissions in a conservation system. Cereal rye followed by cotton was planted in central Alabama during the 2009–2011 crop years. Treatments included cotton planted directly into standing cereal rye, cover crops terminated at early milk growth stage using mechanical (roller or roller/crimper) with or without chemical termination (spraying) followed by cotton planting, and cover crop termination combined with cotton planting using spraying with or without rolling termination. While the 2011 crop year had the lowest plant populations, there was no year effect on seed cotton yields, total costs or net returns. Rolling with or without spraying yielded higher plant populations (26%), seed cotton yields (18.3%) and net returns (17.2%) than cotton planted into standing rye; however, rolling with or without spraying also had 23.8% higher costs due to increased fuel usage, machinery and labor hours, and yield varying costs. While rolling with spraying had slightly higher total costs compared with rolling alone (6.5%), plant populations, seed cotton yields and net returns were 11.42%, 6.4% and 6.5% higher, respectively. Converting from three separate operations for cover crop termination and cotton planting to rolling and spraying combined with planting, producers could potentially reduce CO2 emissions from fuel use and labor hours associated with cover crop termination and cotton planting by up to 51%.

Weed control is challenging to farmers who are transitioning from production systems that use synthetic herbicides to organic systems. A 2-year field study examined air-propelled corncob grit abrasion for in-row weed control efficacy and effect on corn yield. Grit was applied based on corn vegetative developmental stages with one (V1, V3 or V5), two (V1 + V3, V1 + V5, or V3 + V5), or three (V1 + V3 + V5) applications. Flame-weeding or cultivation was used after the V5 application for between-row weed control. Grit applications decreased in-row weed densities by about 60% (α = 0.05) and biomass up to 95% (α = 0.001). Between-row treatments provided similar control, and reduced weed biomass by 55% in 2013 (α = 0.01) and 86% (α = 0.001) in 2014. In-row grit treatments increased corn yield up to 44%, and yield was more influenced by in-row weeds than between row weeds. These results indicate that abrasive corncob grit for in-row weed control, supplemented with cultivation or flaming, can reduce weed biomass substantially and help maintain corn yield. However, timing and frequency of grit application need further refinement based on weed growth as influenced by climate, as treatments at similar corn growth stages did not consistently provide adequate weed control between years.