Effects of One-time Application of Controlled-release Bulk Blending Fertilizer on Grain Yield and Nitrogen Utilization Efficiency of Rice in Tropical Regions
[Objective]Effects of one-time application of controlled-release bulk blending fertilizer(CRBF)on the grain yield and nitrogen utilization efficiency of double-cropping rice farming in tropical regions were studied.[Method]Field experiments were carried out in Fengmu Town,Tunchang County and Dongcheng Town,Danzhou City in Hainan Province during 2016 rice growing season.The conventional fertilization applied in 3 separate times(T1)was implemented along with one-time applications of CRBF without N reduction(T2),with 10%N reduction(T3),and with 20%N reduction(T4).Grain yield,N uptake,and N utilization efficiency on the double-cropping rice cultivation were determined at harvest.[Result]The one-time applications of CRBF promoted N absorption and dry matter accumulation with improved grain yield and N utilization of the rice plants.In comparison to T1,they increased 7.43%-22.84%on the grain yield,8.22%-22.39%on the above-ground dry matter accumulation,12.19%-32.06%on the N accumulation,and 31.67%-75.65%on the N recovery efficiency based on an equal N input of CRBF.Except for the yield of early rice at Dongcheng site,the differences were significant.Moreover,T2 also surpassed T3 and T4 mostly on grain yield,dry matter,and N content as well as N recovery efficiency.[Conclusion]By applying CRBF once annually for the base fertilization,the grain production and N fertilizer utilization of rice plants were significantly improved over the conventional practice.Furthermore,a 10%-20%reduction on N fertilizer did not significantly lower the grain yield.Thus,the application not only simplified the operation but also benefitted the grain production and conserved N for the double cropping rice farming in the tropical regions.
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