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Poultry litter biochar application in combination with chemical fertilizer and Azolla green manure improves rice grain yield and nitrogen use efficiency in paddy soil

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Biochar 2021年第4期3卷 591-602页

作者： Samuel Munyaka Kimani putu oki bimantara Valensi Kautsar Keitaro Tawaraya Weiguo Cheng The United Graduate School of Agricultural Sciences Iwate UniversityMorioka 020-8550Japan Graduate School of Agricultural Sciences Yamagata University1-23Wakaba-machiTsuruokaYamagata 997-8555Japan

Poultry litter biochar is known to improve crop ***,its beneficial interactions with chemical fertilizer and/or organic manure on rice yield and nitrogen(N)use efficiency(NUE)are not well *** objective of this study was to co-apply poultry litter biochar(hereinafter biochar)and chemical fertilizer and/or Azolla as organic manure(herein N fertilizer sources)to improve the productivity of rice and *** treatments-no amendments(control),chemical fertilizer(NPK),Azolla as green manure(Azolla),and NPK+Azolla without and with biochar amendment-were evalu-ated in a pot *** rice plant growth components,yield,and NUE were *** to the treatments without biochar,co-application of biochar and N fertilizer sources significantly improved grain N uptake by 23.9%and NUE by 34.3-246.9%.These treatments also significantly improved rice growth components(5.6-18.2%)and grain yield(32.4%).Significant changes in soil properties including increases in pH,electrical conductivity(EC),total N,organic car-bon,and available phosphorus were observed following biochar *** for the soil pH and EC parameters,no significant synergistic interactions between biochar and N fertilizer sources were observed for any parameters in the present ***,compared to other treatments,the co-application of biochar and Azolla offers a feasible approach to improve rice productivity and NUE and reduce chemical fertilizer use,thereby reducing agricultural pollution and production costs.

关键词： Azolla N use efficiency Poultry litter biochar Rice paddy Synergistic effects

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