Effect of Balanced Fertilization on Yield,Benefit,Quality and Nutrient Cycling of Seed Pumpkin in Heilongjiang Province

Taking seed pumpkin as material,the effect of balanced fertilization on yield,benefit,quality and nutrient cycling of seed pumpkin was investigated in Heilongjiang province.The results showed that balanced fertilization treatments produced higher yields than CK(compared)treatment,and the yield of the best(OPT)treatment(N 55kg/hm2、P2O582.5kg/hm2、K2O 67.5kg/hm2)was the highest.Yield reduction of non-fertilization nitrogen,phosphorus and potassium was about 23.1%,19.3%and 11.1%,CK was about 32.2%.Benefit reduction of non-fertilization nitrogen,phosphorus and potassium was about 3 583,2 681 and 1 411RMB/hm2,CK was about 3 666RMB/hm2.On the basis of the OPT treatment,the effect of non-fertilization N on the assimilation of nitrogen of seed pumpkin,the assimilation of phosphorus and potassium of seed pumpkin was also influenced.On the basis of the OPT treatment,non-fertilization phosphorus and potassium would effect the assimilation of nitrogen phosphorus and nitrogen potassium.It just meant balanced fertilization have an important role in the assimilation of nutrient of seed pumpkin.The agronomic efficiency and fertilizers utilization rate of nitrogen was highest.Meanwhile,phosphate could increase the content of fat and protein,and potassium can increase the content of soluble sugar and starch.