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玉米产量的高低受种植时间、密度和施 Ｐ量、施 Ｎ 量及其施肥方法的影响．在产量大于５．２５０ ｔ·ｈｍ － ２时，５ 个因素的最佳取值为播种时间在 ８ 月 ２ 日～５ 日，密度为７２ ４２０～７６ ０９５ 株·ｈｍ － ２，施 Ｐ 量为 ８２．３３～１０８．１５ ｋｇ·ｈｍ － ２，施 Ｎ 量为１２８．８５～１３６．１０ ｋｇ·ｈｍ － ２，施肥方法以平稳法（前后施肥比例５０∶５０）为佳．
Maize yield by the planting time, density and application of P, N application rate and fertilization methods. When the yield was more than 5.250 t · hm - 2, the optimum values for the five factors were sowing time from August 2 to 5 and density from 72 420 to 76 095 plants · hm -2, 82.33 ~ 108.15 kg · hm - 2, and the N application rate was 128.85 ~ 136.10 kg · hm - 2. The fertilization method was better with the steady method (the ratio of fertilization before and after 50:50).