沙地不同施肥量对玉米产量形成的影响

Effect of Various Amounts of NP Fertilizers on Yield of Spring Corn at Sandy Cropland

对沙地玉米进行不同施肥量的试验研究。结果表明，试验条件下在沙地增加施肥量特别是Ｎ肥可显著增加玉米的产量，增幅达１４．２％～７３．８％，而增施Ｐ肥则对产量增加不显著；玉米产量与施肥量显著相关，相关系数为０．８２７；同时随着沙地玉米产量的增加，其水分利用率也明显提高，增幅达１３．５％～７０．８％。

The experiment was designed at four levels of P (75 kg\5hm -2 ,112 5 kg\5hm -2 ,150 kg\5hm -2 and 187 5 kg\5hm -2 ) for base fertilizer and at three levels of N (300 kg\5hm -2 , 450 kg\5hm -2 and 600 kg\5hm -2 ) for top application in spring corn field. There were 12 treatments in total and 36 plots with each treatment re application three times. Each plot was 4 m 2. The results showed that corn grain yield increased significantly for all treatments as N increased, but insignificantly for P; the water consumption of corn also increased from 476.1 mm to 488.4 mm along with the grain yield increasing. A mathematical model composed of the fertilizer and the water consumption is as follows: Y=154.1X 1+5.26X 2-67896 5, r=0.753.