沙地影响玉米产量形成因子的量化研究(I)

Effect of the Factors of Soil Water Content and Fertilizers on Yield of Spring Corn at Sandy Cropland, in Horqin Sand Land

采用二次回归通用旋转组合设计方法 ,对沙地玉米的水肥因子进行了量化试验研究。结果表明 ,试验条件下沙地农田当土壤相对含水量保持在 6 7.2 % ,施用尿素 5 2 .5 g· m- 2 和施用磷肥 36 .7g· m- 2 时 ,可以获得1.32 kg· m- 2 的最高产量。影响玉米产量形成的敏感因子首先是氮肥施用量 ,其次是土壤相对含水量 ,而磷肥施用量对玉米增产效果不明显。玉米的产量 (Y)与土壤相对含水量因子 (X1 )、氮肥施用量因子 (X2 )和磷肥施用量因子(X3)的关系为 :Y =5 .16 +0 .15 1x1 +0 .2 84x2 - 0 .182 x3+0 .199x1 x2 +0 .40 3x1 x3-0 .2 15 x2 x3- 0 .193x12 - 0 .415 x22 - 0 .0 0 2

The aim of this experiment designed by the general regressive method of rotary combination for building a quadratic equation was try to investigate the relationship between the corn yield and the soil water content, the application amounts of nitrogen and phosphate. There were 20 treatment plots in total and each plot was 4 m\+2. The results show that the amounts of nitrogen and the soil water content are the sensitive factors for increasing corn grain yield in sandy cropland, but the phosphate takes a little role for it. If the soil water content, the amounts of N, the amounts of P is 67\^5%, 55 7 g\5m\+\{-2\}, 36 7 g\5m\+\{-2\}, respectively, the highest corn yield will be 1 32 kg\5m\+\{-2\} under the experimental condition. A mathematical model composed of the soil water content (\%x\-1\%), the amounts of nitrogen (\%x\-2\%) and the amounts of phosphate (\%x\-3\%) is as follow:\$\$Y=5 16+0 151x\-1+0 284x\-2-0 182x\-3+0 199x\-1x\-2+0 403x\-1x\-3- 0 215x\-2x\-3-0 193x\-1\+\+2-0 415x\-2\+\+2-0 002x\-3\+\+2\$\$