The sown area of grain 粮食播种面积
We must protect primary farmland, keep the area sown to grain stable, improve the structure of grain varieties grown and increase the per unit area yield of grain.
要保护好基本农田，稳定粮食播种面积，优化粮食品种结构，着力提高粮食单产。
In this 50 years, grain crops output, the grain crops sown area and the yield per unit of area and the temperature are obviously related, but they are slightly correlative with the precipitation.
近50年的粮食作物产量、粮食作物播种面积和单位面积产量与气温均呈明显的正相关，而与降水的相关性很差。
In 1959, various factors such as reduction of sown areas, less yield per unit area and natural disasters contributed to the decrease in grain output.
1959年开始，由于播种面积减少、单产下降、自然灾害等原因，粮食产量连年下滑。
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