玉米种植制度的高产栽培技术体系 Ⅰ.晚玉米高产栽培技术措施的优化方案

Technical system of high yielding cultivation in maize based cropping system Ⅰ. Optimized scheme of high yielding cultivation in late maize

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．

The performance of maize yield was affected by sowing dates, planting density, N, P supply levels and their fertilizing methods. The optimized values of the 5 factors mentioned above were as follows: sowing dates 2-5 of August, planting density of 72 420-76 095 plants per hm 2, N and P supply levels of 128.85-136.10 kg and 82.23-108.15 kg per hm 2, stable balanced methods of fertilizer application with the ratio of 50∶50 (supply level at early growth stage to that at late growth stage) in terms of more than 5.250 t grain yield per hm 2.