The Effect and the Residual Effect of Special Controlled-Release Nitrogen Fertilizer for Rapeseed(Brassica nap us L.)under Rapeseed-Sesame Rotation System in Red-Soil Dryland
Rapeseed-sesame rotation is the main crop rotation system in red-soil dryland of southern China,but its N use efficiency is low.A field experiment was conducted in the red-soil dryland(Jinxian,Jiangxi)from 2019 to 2020 to explicit effect and the residual effect of special controlled-release nitrogen for rapeseed.The results showed that,one-off basal application of special controlled-release nitrogen for rapeseed(CRN)could enhance the nitrogen supply in the whole growth period and promote the growth of rapeseed,thus ensured stable or even outperformed the effects of conventional nitrogen fertilizer by split application(CN).Compared with CN,CRN increased the biomass,N accumulation and N use efficiency of rapeseed,especially improved the NO3--N concentration,total inorganic N,and use efficiency of residual N and accumulative N in tillage layer soils at rapeseed mature period,and eventually improved the next season sesame yield significantly.In the rapeseed-sesame rotation system,CRN reduced the labor cost of fertilization and improved the crop yield,therefore increased annual economic benefits.Under the treatments of CRN and CN,N rates of sesame season could be reduced by 22.4 and 10.2 kg/ha,respectively.In summary,it was suggested that the special controlled-release nitrogen for rapeseed should be applied to the rapeseed-sesame rotation system in red-soil dryland.Moreover,optimum N fertilization management in sesame season should be optimized with considering the residual effect of N application in rapeseed season.
Red-soil drylandRapeseed-sesame rotationControlled-release nitrogen fertilizerNitrogen use efficiencyResidual effect of nitrogen fertilizerEconomic benefit
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