Impacts of different fertilizer treatments on biomass accumulation,distribution,and nutrient uptake of oilseed rape(Brassica napus L.)

To study the effects of different fertilizer treatments on biomass accumulation,distribution,and nutrient uptake of oilseed rape(Brassica napus L.),a field experiment was conducted in Jiangyan.Oilseed rape was subjected to ten fertilizer treatments,i.e,control(no fertilizer,CK),nitrogen deficiency treatment(PKB),phosphorus deficiency treatment(NKB),potassium deficiency treatment(NPB),macronutrients balanced fertilizer treatment(NPK),boron(B) adding treatment(NPKB),boron and zinc(Zn) adding treatment(NPKBZn),1/2 nitrogen fertilizer application treatment(1/2 N+PKB),3/2 nitrogen fertilizer application(3/2 N+PKB),two times nitroger fertilizer application(2 N+PKB).The results were showed as follows.In the nutrients shortage treatments,the order of biomass for each aboveground organ was PKB treatmentNKB treatmentNPB treatment,and the distribution of biomass in stem was presented as PKB treatmentNKB treatmentNPB treatment.When boron was added on the basis of NPK application,potassium in stem,shell,and grain significantly increased,and accumulations of nitrogen and phosphorus in shell and grain were improved by adding zinc.In the treatments of PKB,1/2N+PKB,NPKB,3/2N+PKB,2N+PKB,biomass of stem was driven up by the increase of N fertilizer application rate,however,biomass of shell and grain reached the maximum in 3/2 N+PKB treatment,and showed a downward trend when N application rate continued to increase.With the increase of nitrogen fertilizer application rate,accumulations of nitrogen,phosphorus and potassium increased in stem(P0.05),and first increased then kept stable in grain.From the perspective of nutrient uptake,application of boron significantly increased potassium accumulations in stem,shell,and grain,and cumulative uptakes of nitrogen and phosphorus in grain were further improved by adding zinc.