通辽市水稻高产优化施肥模型的建立和施肥参数的确定

采用"3414"二次回归最优设计试验方案,研究氮(X1)、磷(X2)、钾(X3)肥配施对水稻产量的影响,并对水稻产量和施肥量关系进行模拟。结果表明:水稻产量(Y)与肥料用量之间的数学模型为Y=301.48+178.19 X1+27.64 X2+40.29 X3-56.18 X12-22.08 X22-13.05 X32+22.87 X1X2+6.14 X1X3+2.93 X2X3,该模型的最高产量施肥量为235.5(纯氮),84.0(P2O5)和84.0(K2O)kg.hm-2,最高产量为8 371.95kg.hm-2,施肥配比为1∶0.36∶0.36。该试验区土地肥力情况为氮素水平低下,磷素、钾素水平中等。肥料利用率氮肥为40.1%、磷肥为17.5%、钾肥为41.0%,土壤养分校正系数分别为0.51(氮)、1.14(磷)、0.56(钾)。

Establishment of model for optimal fertilization and determination of fertilization parameters of rice in Tongliao

The effect of balanced application of N,P,K fertilizations was studied on rice yield by using of "3414",optimal design of quadratic regression test program.The results showed that the mathematical model of regression between rice yield(Y) and fertilization(X) was Y=301.48+178.19X1+27.64X2+40.29X3-56.18X12-22.08X22-13.05X32+22.87X1X2+6.14X1X3+2.93X2X3,The result showed as follows: when the maximal yield of rice was 8 371.95 kg·hm-2,the fertilization amount were respectively N 235.5,P2O5 84.0 and K2O 84.0 kg·hm-2 with formula of 1∶0.36∶0.36.The results also showed that the level of N,P and K in the field were respectively low,medium and medium,the utilization rates of N,P2O5 and K2O in the season were respectively 40.1%,17.5% and 41.0%,the soil nutrient correction factor of N,P2O5 and K2O were respectively 0.51,1.14 and 0.56.