试验的提出与经过贵州位于北纬24°35′～29°59′和东经104°17′～108°20′的云贵高原东斜面。立体农业特点明显。属亚热季风湿润气候型。田少土多,玉米是主要的旱粮。省内大部分地区年均温为15℃左右。≥10℃的积温为4000—5500℃,低热地区则在5500~6500℃以上。年雨量为800~1200毫米,而夏季三个月中较多。夏季与初秋的日照时数几占全年的半数,这时又是雨、热、光周期,不仅有利春玉米生育,同时对夏玉米的生育 The experiment was proposed with the eastern slope of the Yunnan-Guizhou Plateau that runs through latitude 24 ° 35 ’~ 29 ° 59’ north latitude and 104 ° 17 ’~ 108 ° 20 ° east longitude. Three-dimensional agriculture has obvious characteristics. Is a sub-humid monsoon climate. Field less land, corn is the main drought food. The average annual temperature in most parts of the province is about 15 ℃. The accumulated temperature of ≥10 ℃ is 4000-5500 ℃, while the low temperature is 5500 ~ 6500 ℃. Annual rainfall of 800 ~ 1200 mm, while in summer more than three months. Summer and early autumn sunshine hours accounts for half of the year, when it is rain, heat, light cycle, not only conducive to the growth of spring maize, maize fertility at the same time