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WeedTurf: a predictive model to aid control of annual summer weeds in turf

Published online by Cambridge University Press:  20 January 2017

Roberta Masin ,
Maria Clara Zuin ,
David W. Archer ,
Frank Forcella  and
Giuseppe Zanin
Maria Clara Zuin
Affiliation:
Istituto di Biologia Agroambientale e Forestale IBAF-CNR, Viale dell'Università, 16 35020 Legnaro (PD), Italy
David W. Archer
Affiliation:
USDA-ARS, North Central Soil Conservation Research Laboratory, 803 Iowa Avenue, Morris, MN 56267
Frank Forcella
Affiliation:
USDA-ARS, North Central Soil Conservation Research Laboratory, 803 Iowa Avenue, Morris, MN 56267
Giuseppe Zanin
Affiliation:
Dipartimento di Agronomia Ambientale e Produzioni Vegetali, Università di Padova, Viale dell'Università, 16 35020 Legnaro (PD), Italy
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Abstract

Predicting weed emergence is useful for planning weed management programs. Unfortunately, our ability to anticipate initial emergence and subsequent levels of emergence from simple field observations or weather reports is often inadequate to achieve optimal control. Weed emergence models may provide predictive tools that help managers anticipate best management options and times and, thereby, improve weed control. In this study, the germination characteristics of four annual grass weeds (large crabgrass, goosegrass, green foxtail, and yellow foxtail) were investigated under different temperatures and water stresses to calculate base temperatures and base water potentials. These parameters were used to develop a mathematical model describing seedling emergence processes in terms of hydrothermal time. Hydrothermal time describes seed germination in a single equation by considering the interaction of soil water potential and soil temperature. The model, called WeedTurf, predicted emergence with some accuracy, especially for large crabgrass (lowest efficiency index [EF] value 0.95) and green foxtail (lowest EF value 0.91). These results suggest the possibility of developing interactive computer software to determine the critical timing of weed removal and provide improved recommendations for herbicide application timing.

Keywords

Goosegrass, Eleusine indica (L.) Gaertn. ELEINgreen foxtail, Setaria viridis (L.) Beauv. SETVIlarge crabgrass, Digitaria sanguinalis (L.) Scop. DIGSAyellow foxtail, Setaria glauca (L.) Beauv. SETLUAnnual grass weedsemergence predictionhydrothermal timeturf
Type
Weed Management
Information
Weed Science , Volume 53 , Issue 2 , April 2005 , pp. 193 - 201
Copyright
Copyright © Weed Science Society of America 

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