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The effect of biochar on mycorrhizal fungi mediated nutrient uptake by coconut(Cocos nucifera L.)seedlings grown on a Sandy Regosol

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Biochar 2022年第1期4卷 56-73页

作者： Gertrude Scynthya Nirukshan Sanathanie Ranasinghe Steven Sleutel Department of Environment Ghent UniversityCoupure Links 6539000 GhentBelgium. coconut Research Institute Lunuwila 61150Sri Lanka

Biochar amendment of soil may ameliorate inherently infertile soils,such as in the typical coconut(Cocos nucifera L.)growth areas along tropical coasts,where,moreover,temporary moisture stress commonly *** conducted a pot experiment to evaluate the effects of biochar soil amendment(1%w/w)produced from Gliricidia sepium stems(BC-Gly)and rice husks(BC-RiH)on the growth of coconut seedlings and on N and P uptake mediated by mycorrhizae under wet or dry conditions in a Sandy *** pots were divided into root and hyphal zones by a nylon mesh,where 15N labelled N and P nutrients were only provided in the hyphal *** wet conditions,biochar applica-tion did not affect plant growth,while under dry conditions,the BC-Gly increased root and plant growth similar to that under wet ***-Gly increased the acidic pH of the soil to a neutral level,and the microbial community shifted towards a higher fungal *** P accumulated(Pacc)in roots was higher with BC-Gly and BC-RiH under dry and wet conditions,*** weakly correlated with the abundance of arbuscular mycorrhizal fungi(AMF)in the hyphal *** BC-Gly roots showed lower N derived from *** conclude that biochar application has no impact on crop growth under wet conditions,while under dry conditions,BC-Gly stimulates crop growth and P uptake,probably through liming induced P availability but also possibly by some enhancement of AMF *** shift in the fungal-oriented microbial community and reduced plant fertilizer N uptake suggested that BC-Gly acted as an additional N source.

关键词： coconut growing soil 15N isotope labelling Root-exclusion study container Phosphorus Moisture stress

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