from Part IV - Biochar Application as a Soil Amendment
Published online by Cambridge University Press: 01 December 2016
Arbuscular mycorrhizal fungi (AMF) are key organisms of the soil–plant system, and contribute to the uptake of nutrients and water. AMF also play a role in the aggregation and structural stability of soil. Biochar may provide a suitable habitat for mycorrhizal growth, which is also favorable in view of productive soils. The impact of a combination of biochar and mycorrhizae on plant growth was assessed in case studies. One of the main findings was that biochar application alone at 40 Mg ha-1 did not influence growth of citrus seedlings. However, biochar and mycorrhizae species inoculation significantly increased shoot and root dry weight. In general, the contribution of mycorrhizae seemed to be higher than the biochar contribution alone and a combination performed best. This might be a result of the mycorrhizae inoculum activating the biochar when added into the rhizosphere, which is a rich medium for other beneficial soil organisms. Although the relationship between biochar and mycorrhizal colonization is not yet entirely clear, the effect of physical protection of hyphae from fungal grazers might be facilitated as a consequence of the pore structure of biochar. The results also provide evidence for competition between biochar and plant nutrient uptake.
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