Construction Of Mathematic Model For Solar Greenhouse Cucumber Balanced Fertilization In The Sandy Land

By means of quadratic component rotational design under the condition of sandy land, the comprehensive effect of the concentration of N,P and K on the yield and quality of solar greenhouse cucumber was study. Also the reaction model between the cucumber yield,content of NO3-N in cucumber and the N,P and K was established. Analysis result showed:1. With the aid of the computer, the model demonstration relationship between yield factor (Y) and three element factors the concentrations of N,P and K were established. The model is as follow: Y=112821.16+4692.11X1+414.66X2+2617.25X3-3467.97X12-2085.66X22-3570.85X32+ 586.50 X1X2+1861.87X1X3+1699.50X2X3 The effect of three factors N,P and K on the yield of cucumber increase by degrees in series of potassium(K), phosphorus(P) and nitrogen(N).2. After analysis the model, the interaction between N and K, N and P,P and K, which are significant positive interaction in lower level and significant negative interaction in high level.3. The Border yield effect of variation of N and K on cucumber is alike and N effect beside K effect, while P effect on border yield is remarkable lower than the former.4. By the simulation with computer, to achieve the highest plant yield 114 045.30 kg/hm2 , the optimal combination of N,P2O5 and K2O was 265.66,86.90 and 288.46 kg/hm2 respectively.5. Another mathematic model involving the N, P, K and cucumber NO3-N content was established. It's as follow: Y= 5 948.3+2 054.6 X12+ 3 347.2 X1X2 5.1 The important effect factor on cucumber NO3-N content is nitrogen, beside the interaction between N and P also effect cucumber NO3-N content. 5.2 By the simulation with computer, the optimal combination of N,P2O5 and K2O was 161.60,86.90 and 288.46 kg/hm2 respectively when cucumber NO3-N content is the least.6. In the verification experiment, there are three treatments the optimal combination, the...