Study On The Effects Of N, P, K On Yield And Quality Of Color Sweet Pepper

This experiment studied the effects of N,P,K on yield and quality of color sweet pepper by means of the "311-A" optimization compound design .The regression equations of the relation with N,P,K and the effects on yield and quality were established. Different optimum combinations of N ,P ,K were established according to different targets by the software on computer.The results were showed as follow:(l)In terms of main effect on yield, the three kinds of fertilizers were showed in the order as K>P>N.To the content of Vc and total sugar were in the order as K>N>P.But to the contents of dry matter and nitrate were in the order as N>K>P.(2)The interactive effects on yield of N,P,K was in the order as NK>NP>PK,and to the content of Vc and nitrate were NP>NK>PK,but to the content of total sugar was showed in the order as NK>NP>PK,and to content of dry matter was NK>PK>NP.(3)In terms of effect on boundary yield, the three kinds of fertilizers were showed in a decreasing order. i.e.K>P>N, and N>K>P on boundary content of Vc. But the effect P>K>N on boundary content of total sugar,and nitrate was in the same time,the effect on boundary content ofdry matter was N>P>K.(4)The effects of different combination of N,P,K fertilizer on carotene, chlorophyll and N,P,K in fruits of color sweet pepper were not significant.The content of total N and total K of color sweet pepper would increase with N high supply.(5)The optimum combination of N, P, K fertilizer on yield, content ofVc , total sugar, dry matter, nitrate ,and synthesizing targets were(kg/666.7m2) N 50.00, P2O51937, K2O 60.00, N 39.88, P2O515.60, K2O 47.19,N 49.03 , P2O516.15, K2O 60.00, N 4459, P2O513.37, K2O 60.00, N 27.43, P2O518.65,K2O 22.20, N49.63, P2O516.14, K2O 58.65.