作者：LIGuang-hao,CHENGGui-gen,LUWei-ping,LUDa-lei 单位：JiangsuKeyLaboratoryofCropGeneticsandPhysiology/JiangsuKeyLaboratoryofCropCultivationandPhysiology/AgriculturalCollege,YangzhouUniversity/JiangsuCo-InnovationCenterforModernProductionTechnologyofGrainCrops 本文刊于： 《Journal of Integrative Agriculture》 2021年第02期
关键词:
springmaize grainyield slowreleasefertilKeywords
spring maize, grain yield, slow release fertilizer, nitrogen use efficiency, economic benefit
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摘要
Excessive or insufficient application of fertilizer has raised broader concerns regarding soil and environmental degradation.One-time application of slow release fertilizer （SF） has been widely used to reduce yield gap with potential maize yield and improve nitrogen use efficiency （NUE）.A 2-year field experiment （2018–2019） was conducted to evaluate the effects of SF rates from 0 to 405 kg N ha–1 （named F0,SF225,SF270,SF315,SF360,and SF405） and 405 kg N ha–1 of common fertilizer（CF405） on the grain yield,biomass and N accumulation,enzymatic activities related with carbon–nitrogen metabolism,NUE and economic analysis.Results indicated that the highest grain yields,NUEs and economic returns were achieved at SF360in both varieties.The enzymatic activities related with carbon–nitrogen metabolism,pre-and post-silking accumulation of biomass and N increased with increasing SF rate,and they were the highest at SF360 and SF405.The grain yield at SF360had no significant difference with that at SF405.However,the N partial factor productivity,N agronomic efficiency and N recovery efficiency at SF360 were 9.8,6.6 and 8.9% higher than that at SF405.The results also indicated that the average grain yields,NUE and economic benefit at SF405 were 5.2,12.3 and 18.1% higher than that at CF405.In conclusion,decreasing N rate from 405 kg ha–1（CF） to 360 kg ha–1（SF） could effectively reduce the yield gap between realized and potential maize yields.The N decreased by 11.1%,but the yield,NUE and economic benefit increased by 3.2,22.2 and 17.5%,which created a simple,efficient and business-friendly system for spring maize production in Jiangsu Province,China.
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