Study on Fertilization Effect by Optimal Design and Hydroponics

Abstract

Abstract: The effects of Ca(NO3)2?4H2O, KNO3, NH4H2PO4, MgSO4?7H2O on the yield of hydroponic cabbage was studied by optimal design 416-A. A fertilization effect equation of the relationship between the yield of cabbage and the usage of four fertilizers was established by mathematic modeling, it was: y=97.808-4.337x1+3.445x2-2.690x3+8.299x4-6.894x1x2+17.331x1x3-7.389x1x4-3.191x2x3+6.364x2x4+0.063x3x4-9.629x12-17.150x22-17.915x32-24.066x42 .The regression relationship was tested significant and all the regressive coefficients were also tested. The regressive equation showed: MgSO4?7H2O mainly effected the yield directly, the less was Ca(NO3)2?4H2O, KNO3, NH4H2PO4 by sequent. Ca(NO3)2?4H2O has interactive effect with the other three fertilizers, in which the interactive effect with NH4H2PO4was very significant. The concentration of the selected nutrient solution composition by regressive relationship was: Ca(NO3)2?4H2O: 971mg/L, KNO3: 931mg/L, NH4H2PO4: 204mg/L, MgSO4?7H2O: 581mg/L. The fertilization effect studied by the optimal design with hydroponics was precise and effective.

CLC Number:

S147

Wang Zhongquan, Sun Lina, Lai Dongmei, Wei Peiru, Lin Wensheng, Luo Shenghai. Study on Fertilization Effect by Optimal Design and Hydroponics[J]. Chinese Agricultural Science Bulletin, 2007, 23(2): 138-138.

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Study on Fertilization Effect by Optimal Design and Hydroponics

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