甘肃省秋粮作物约占全省粮食面积的43% ,而玉米是甘肃秋粮主要粮食作物 ,播种面积将近 80 0万亩 ,约占秋粮的 36 %。 1 999年甘肃省玉米产量大丰收 ,全生育期 1 34～1 5 9ｄ ,≥ 0℃的积温 2 5 99℃～ 31 1 4℃ ,除天水、武威比去年偏少 1 5 1℃、36℃外 ,省内其余地方偏多 4～ Autumn crops in Gansu Province account for about 43% of the province’s grain area, while maize is the main grain crop in Gansu autumnal areas with sown area of ​​nearly 800 million mu, accounting for 36% of autumn grain. In 1999, the yield of maize in Gansu Province was bumper. The whole growth period ranged from 34 to 155 days. The accumulated temperature ≥ 0 ℃ was 259 ℃ ~ 31 1 4 ℃, except for Tianshui and Wuwei, which were 151 ℃ less than the previous year and 36 ℃ Outside, the rest of the province more than 4 ~