[Objective]The aim was to research effects of N fertilizer reduction and application of N fertilizer(as base fertilizer)on rapeseed yield and N absorption.[Method]Based on Ganyouza No.5,the ratio of N,P2O5 andK2O was ...[Objective]The aim was to research effects of N fertilizer reduction and application of N fertilizer(as base fertilizer)on rapeseed yield and N absorption.[Method]Based on Ganyouza No.5,the ratio of N,P2O5 andK2O was set at 1:0.5:0.5;N fertilizers were set involving reduced quantity at 150 kg/hm2 and preferred quantity at 180 kg/hm2;100%,80%and 60%of N fertilizers were applied as base fertilizers in the test respectively.In general,field tests were conducted to explore effects of reduced N fertilizer and application of N fertilizer as base fertilizer on rapeseed yield and N absorption.[Resalt]When applied N fertilizer as base fertilizer was the same,plant height,stem diameter,length of major inflorescence,number of effective branch,pod number per plant,seed number per pod,and biomass yield in group with preferred N quantity were significantly higher than those in group with reduced N fertilizer.Rapeseed yield and profits in group with preferred N quantity were signifi-cantly higher than those in group with reduced N fertilizer in field with moderate fertili-ty.In fields with higher fertility,however,the two factors were just a little higher.In group with reduced N fertilizer,use efficiency of N fertilizer,N uptake efficiency,par-tial factor productivity and harvest index of N were all significantly higher than those in group with preferred N fertilizer.Agronomic nitrogen use efficiency in group with preferred N fertilizer was significantly higher than that in group with reduced N fertiliz-er in field with moderate fertility and was significantly lower in field with high yield.With amounts of N,P and K fertilizers fixed,economic characters,yield constitution,yield,profits and N absorption in group,where 60%of N fertilizers were applied as base fertilizer,were significantly higher than those in groups with 80%or 100%of base fertilizer(N fertilizers).These indicated that rational fertilization would maintain rapeseed yield high and reduce N input to improve use efficiency of N fertilizer.On the other hand,it is effective to improve rapeseed yield.'to reduce N fertilizer to 150 kg/hm2,and application of 60%.of N fertilizers as base fertilizer is still proved optimal at present.[Conclusion]The research provides.theoretioal and technical references for improvement of yield of rapeseed and efficiency of N fertilizer.展开更多
基金Supported by China Modern Agriculture Research System(CARS-13)Jiangxi Technological Innovation Team(20115BCB29020)Innovation Funds of Jiangxi Academy of Agricultural Sciences(2011CJJ012)
文摘[Objective]The aim was to research effects of N fertilizer reduction and application of N fertilizer(as base fertilizer)on rapeseed yield and N absorption.[Method]Based on Ganyouza No.5,the ratio of N,P2O5 andK2O was set at 1:0.5:0.5;N fertilizers were set involving reduced quantity at 150 kg/hm2 and preferred quantity at 180 kg/hm2;100%,80%and 60%of N fertilizers were applied as base fertilizers in the test respectively.In general,field tests were conducted to explore effects of reduced N fertilizer and application of N fertilizer as base fertilizer on rapeseed yield and N absorption.[Resalt]When applied N fertilizer as base fertilizer was the same,plant height,stem diameter,length of major inflorescence,number of effective branch,pod number per plant,seed number per pod,and biomass yield in group with preferred N quantity were significantly higher than those in group with reduced N fertilizer.Rapeseed yield and profits in group with preferred N quantity were signifi-cantly higher than those in group with reduced N fertilizer in field with moderate fertili-ty.In fields with higher fertility,however,the two factors were just a little higher.In group with reduced N fertilizer,use efficiency of N fertilizer,N uptake efficiency,par-tial factor productivity and harvest index of N were all significantly higher than those in group with preferred N fertilizer.Agronomic nitrogen use efficiency in group with preferred N fertilizer was significantly higher than that in group with reduced N fertiliz-er in field with moderate fertility and was significantly lower in field with high yield.With amounts of N,P and K fertilizers fixed,economic characters,yield constitution,yield,profits and N absorption in group,where 60%of N fertilizers were applied as base fertilizer,were significantly higher than those in groups with 80%or 100%of base fertilizer(N fertilizers).These indicated that rational fertilization would maintain rapeseed yield high and reduce N input to improve use efficiency of N fertilizer.On the other hand,it is effective to improve rapeseed yield.'to reduce N fertilizer to 150 kg/hm2,and application of 60%.of N fertilizers as base fertilizer is still proved optimal at present.[Conclusion]The research provides.theoretioal and technical references for improvement of yield of rapeseed and efficiency of N fertilizer.
