Effect of Biochar-based Fertilizer Application on Rice Yield and Nitrogen Utilization in Film-mulched PaddyFields
[Objective]To investigate the impact of biochar-based fertilizers and increased biochar application on grain yield and nitrogen utilization of film-mulched rice,aiming to provide a theoretical foundation for sustainable rice mulching technology.[Methods]Utilizing the high-quality conventional japonica rice variety Zhehexiang 2(ZHX2)and the indica-japonica hybrid rice Yongyou 538(YY538),film-mulched mechanical transplanting experiments were conducted in 2021 with CK(no nitrogen application),T1(slow-release fertilizers),and T2(biochar-based fertilizers)treatments.In 2022,similar experiments were conducted with CK,T2,T3(biochar-based fertilizers with an additional 6 t/hm2 biochar),and T4(biochar-based fertilizers with an additional 12 t/hm2 biochar)treatments.The study assessed the effects of biochar-based fertilizer application on dry matter accumulation,yield,yield components,and nitrogen uptake and utilization in mulched rice fields.[Result]Biochar-based fertilizers enhanced the growth and yield of mulched rice.They significantly increased dry matter accumulation by 5.40％to 29.69％compared to T1,and additional biochar application further increased dry matter accumulation by 9.28％to 46.91％compared to T2.The impact was consistent throughout ZHX2's growth duration,with YY538 showing more significant effects in the later stages.Biochar-based fertilizers significantly boosted rice yield by 3.84％to 4.65％compared to T1.Increased biochar application led to a 7.97％to 15.06％yield increase compared to T2.Biochar-based fertilizers enhanced nitrogen uptake and utilization,improving nitrogen utilization efficiency.They increased nitrogen accumulation in critical growth periods by 4.87％to 31.68％,with higher accumulation observed with additional biochar application.The highest nitrogen accumulation was achieved in T4,showing an 11.87％to 40.59％increase compared to T2.Biochar-based fertilizers reduced nitrogen dry matter productivity and nitrogen grain production efficiency but enhanced nitrogen partial factor productivity,nitrogen agronomic efficiency,and nitrogen recovery efficiency.Increased biochar application further improved nitrogen utilization and reduced losses.[Conclusion]Applying biochar-based fertilizers in mulched rice fields enhances dry matter mass and nitrogen accumulation,with additional biochar application further improving these effects,leading to increased yield and nitrogen utilization efficiency.The yield increase in ZHX2 was primarily due to panicle number and grain number per panicle,while in YY538,it was due to panicle number,with the best effect observed in T4.
film mulchingbiochar-based fertilizeryieldnitrogen utilizationrice
万方数据
维普
