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通过对京郊土壤养分含量为中氮低磷低钾(路西南)和高氮低磷低钾(路东)的2个试验点进行“3414”肥料效应试验,得出最佳施肥量,为京郊养分不平衡土壤的推荐施肥提供依据。试验结果表明:氮磷钾肥对文中2个试验点都有增产作用,但是作用大小不同,路西南氮肥>钾肥>磷肥,路东为钾肥>磷肥>氮肥,产量随氮磷钾肥用量的增加出现先增加后减小的趋势;获得最高产量和最高经济效益的推荐施肥量2试验点差别较大,均为路东低于路西南;玉米粗蛋白含量受施氮量影响较大,随施氮量增加先增加后降低,施氮量为1水平时达到最高。综上分析,中氮低磷低钾土壤和高氮低磷低钾土壤青饲玉米的氮磷钾肥推荐量分别为170.0～200.0、80.0、110.0kg/hm2和120.0～150.0、70.0、80.0kg/hm2。
Through the experiment of “3414” fertilizer effect on the soil nutrient contents in the suburbs of Beijing, two fertilizers were tested under low phosphorus and low potassium (southwest of the road) and low phosphorus and low potassium (east of the road) , Providing the basis for the recommended fertilization of imbalanced soil in the suburb of Beijing. The results showed that N, P and K fertilizers increased the yield of the two experimental sites in the article, but the effect was different with the increase of N, P, K Increase and then decrease; the highest yield and the highest economic efficiency of the recommended amount of fertilizer 2 test points are different, are road east lower than southwest; corn crude protein content affected by the amount of nitrogen application, with the amount of nitrogen Increasing first and then decreasing, reaching the highest when the nitrogen level is 1 level. In conclusion, the recommended N, P, K fertilizers were 170.0 ~ 200.0, 80.0, 110.0 kg / hm2 and 120.0 ~ 150.0, 70.0 and 80.0 kg / hm2.