Studies On Effects Of Different Itrogen, Potasium And Magnesium Levels On The Growth,Development,Yield And Quality Of Pumpkin

"311-A" optimal regression design was used to study the effect of nitrogen, potassium, magnesium compound fertilization treatments on yield and quality of pumpkin. And regression equation was founded by using computer software and worked out the optimum compose fertilization of pumpkin with high yield and quality. The result showed as follows:1 Appropriate nitrogen (284.84mg/L) , potassium (406. 05mg/L) and magnesium (62. 5mg/L) levels promoted the growth and development of pumpkin. At the same time enhanced the photosynthesis, and also raised its yield and quality.2 Treatment of lower nitrogen (80 mg/L) , potassium (150 mg/L) and magnesium (10 mg/L) not only delayed the growth and development of pumpkin, but also decreased its yield and quality; The pumpkin s yield and quality could be enhanced as the level of N, K, Mg was enhanced properly; But hight of level of nitrogen, potassium and magnesium could decreased itsyield and quality.3 Appropriate nitrogen, potassium and magnesium levels promoted the plant of pumpkin absorber of nitrogen, potassium and magnesium, lower nitrogen, potassium and magnesium levels enhance the absorber of magnesium, but not good at nitrogen, potassium. Highter nitrogen, potassium and magnesium levels decreased the absorber of nitrogen, potassium and magnesium.4 Mutual effects of N- K, N—Mg and K-Mg had positive compound effect on the yield and fecula contents of pumpkin when nitrogen, potassium and magnesium were at proper level. But had negative compound effect if their level were too high.5 Regressive analysis showed that the optimum compose of nitrogen, potassium and magnesium on yield and fecula contents of pumpkin was 267.8mg/L, 408 mg/L, 51.48 mg/L respectively.