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

作　　者：Samuel Munyaka Kimani Putu Oki Bimantara Valensi Kautsar Keitaro Tawaraya Weiguo Cheng 

机构地区：[1]The United Graduate School of Agricultural Sciences,Iwate University,Morioka 020-8550,Japan [2]Graduate School of Agricultural Sciences,Yamagata University,1-23,Wakaba-machi,Tsuruoka,Yamagata 997-8555,Japan

出　　处：《Biochar》2021年第4期591-602,共12页生物炭（英文）

基　　金：This research was in part funded by the Japan Society for the Promotion of Science Grant-in-Aid for Scientific Research Grant Number(B)26310304.

摘　　要：Poultry litter biochar is known to improve crop productivity.However,its beneficial interactions with chemical fertilizer and/or organic manure on rice yield and nitrogen(N)use efficiency(NUE)are not well studied.The 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 NUE.Eight 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 trial.Selected rice plant growth components,yield,and NUE were determined.Compared 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 application.Except 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 study.Notably,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 

分 类 号：S511[农业科学—作物学]