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| Effect of Fertilizers on Yield of Watermelon —— a Mathematical Model Study |
| Zhang Xiang; Zhu Hongxun; Sun Chunhe et al. |
| Soil and Fertilizer Institute; Henan Academy of Agricultural Sciences; Zhengzhou 450002 |
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Abstract With the design of the current rotation regression combination,the high yield mathema tical model on watermelon was studied,in which N,P and K were supplying factors,watermelon yield was objective funcation. According to the objective funcation,the most suitable amounts of fertilization for yield were as follows:N 210kg/ha,P 2O 5 80kg/ha,K 2O 175kg/ha,under this circumstance,the yield was 47175.9kg/ha,the profit was 26 910.5 yuan/ha. In addition,the single factor effects of N,P,K and their interact...
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Received: 01 January 1900
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