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通过对不同生态条件下玉米主要生育阶段田间小气候的观测分析，结果表明，毕节高海拔地区３３３３～４４４４株／６６７ｍ２播种密度在玉米生长发育关键时期（大喇叭口－抽雄叶丝）的田间小气候随密度增加更为适合玉米生长发育及产量形成，特别是每６６７ｍ２４４４４株这一密度群体结构最为合理，株间温度２２～２３℃，相对湿度为８５％左右，对太阳辐射能吸收能力强，反射损失少，气候资源的利用率较高，玉米实际６６７ｍ２产５２２２３ｋｇ，洋芋、玉米套作复合产量达６７６５８ｋｇ／６６７ｍ２，相对于其它密度能获得较佳的生态环境和经济效益。若按当地当年气候资源估算，其利用率仅为３４８％，可能增产潜力非常大。
Through the observation and analysis of the field microclimate in the main growth stages of maize under different ecological conditions, the results showed that the field microclimate of 3333 ~ 4444 plants / 667m2 in the high elevation area of Bijie in the critical period of corn growth and development The increase of density is more suitable for the growth and yield formation of maize. Especially for each 667m24444 strain, the population structure of this density is the most reasonable. The temperature between strains is 22 ~ 23 ℃, and the relative humidity is about 85%. It has strong solar energy absorption and reflection loss Less utilization rate of climatic resources is higher, the actual corn production of 667m2 522 23kg, potato, corn sets for the combined production of 676 58kg / 667m2, relative to other densities to obtain better ecological environment and economic benefits. According to the local climatic resources of the year, the utilization rate is only 348%, which may increase yield potential is very large.