小白菜平衡施肥数学模型模拟研究

Simulation on the mathematical model of balanced fertilization in Pak-ch iovegetable crop.

试验研究建立了小白菜平衡施肥数学模型 ,并模拟出小白菜N、P、K肥施用量与产量及利润的回归方程 ,应用边际分析法获得小白菜最高产量施N肥量为 137 12kg/hm2 ,N∶P2 O5∶K2 O =1∶0 77∶0 98;最佳利润施N肥量为 12 3 74kg/hm2 ,N∶P2 O5∶K2 O =1∶0 85∶1。

The mathematical model of balanced fertilization in Pak -c hio vegetable crop is established,and th e regression equations in the relati onsh ips among the fertilization and yield as well as its profit have been simulated. The marginal analysis indicates that the most suitable fertilization for the hig hest yield of Pak -chio is 137.12kg/hm2 N,a nd the ratio of N,P 2O 5 and K 2O is 1∶0 .7 7∶0.98;the most suitable fertilization f or the highest profit of Pak -chio is 123 .74kg/hm2 N,and the ratio of N,P 2O 5 and K 2O is 1∶0.85∶1.