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鄂西南山区平均海拔高度1000米以上，形成了独特的农业生产环境条件．研究资料表明，海拔每升高100米，气温下降0．6℃；每升高300米，年降雨量增加100毫米．试验选择在海拔300～900米的低山和二高山进行．玉米是鄂西南山区的主要早作物，提高玉米产量，推广平衡施肥具有重要意
The average altitude of mountainous areas in southwestern Hubei is over 1000 meters, forming a unique agricultural production environment. Research data show that for every 100 meters above sea level elevation, the temperature dropped by 0.6 ° C; for every 300 meters increased, annual rainfall increased by 100 millimeters. The test was conducted at low and high altitudes of 300 to 900 meters above sea level. Maize is the main early crop in the mountainous area of southwest Hubei, it is of great significance to increase the yield of maize and to promote balanced fertilization