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玉米是我区的主要粮食作物,常年种植面积约220—230万亩,其分布大体是:河谷川地约20余万亩,亩产300—400斤,是玉米稳产区;高山挂牌地(海拔在1000米以上)约30余万亩,亩产100斤以内,是玉米低产区;丘陵线山地区面积最大,达170余万亩,亩产200—300斤,是玉米主产区。我区玉米产量较低,1949—1972年的24年里,历年平均亩产一直排徊在100斤左右,其中100斤以下的就有11年。由于玉米亩产低,所以播种面积波动较大,解放初期接近300万亩,1972年只有178万亩,面积减少近40%。单产从70年代以后,由于改进了耕作栽培制度,并扩大了杂交种的种植,有较大幅度的
Maize is the main food crop in our district. The annual planting area is about 220-230 mu. The distribution is roughly: about 20 mu of river valley, 300-400 kg per mu, stable area of maize; More than 1000 meters) of about 30 million mu, less than 100 pounds per mu, is a low-yielding corn area; hill area of the largest area, up to 170 acres, 200-300 pounds per mu, is the main producing areas of corn. The output of maize in our district is relatively low. In the 24 years from 1949 to 1972, the average yield per mu of the past years has been around 100 kilograms, of which 11 years have been below 100 kilos. Due to the low yield per mu of corn, the sown area fluctuated greatly, reaching nearly 300 million mu in the early period of liberation, only 178 million mu in 1972 and nearly 40% of the area reduced. Yields Since the 1970s, due to the improvement of the tillage and cultivation system and the expansion of the cultivation of hybrids, there is a more substantial