全部

1·America's winter wheat plantings are up 4% and the spring-sown area is likely to rise more.

美国冬小麦的种植增长了4%，春季耕种面积很可能会增加更多。

2·The northeast ecological agriculture region has no space to adjust the crops sown area for the more population and few land.

东北部生态农业建设区由于耕地面积较少和人口较多的原因，粮食作物播种面积已无压缩余地。

3·The general hypothesis of this study is that crop sown area change is directly linked with farmer decisions on crop choice, and what k.

模型建立思路是：作物播种面积变化是农户作物选择行为的直接结果，而选择何种作物进行播种是由作物效用决定的。

4·While the wheat sown area is stable, the sown area of maize and cotton fluctuated greatly and the area of vegetable has increased constantly.

耕地内部种植结构表现为小麦播种面积稳定，玉米和棉花面积变化起伏大，蔬菜面积不断上升。

5·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。

6·The practice showed that the forest area may account for about 30%of the total sown area, so long as the Suitable sown area and sowing time are chosen.

实践表明，只要播区、播期选择适宜，该区飞播油松成林面积可望占30%左右。

7·Potential dynamics of agricultural crop sown area has attracted a wide range of attention from numerous researchers due to its ecological and socioeconomic implications.

农作物播种面积动态变化因其重要性已经引起了国内外学者的广泛关注。

8·The sown area change has not obvious effects on the production in the various regions, but the continuous decreased sown area has restrained the production in the East and Central South of China.

而各地区播种面积的变化对其总产量影响不太明显，但华东和中南地区农业播种面积的持续下降对粮食总产量有较大的抑制作用。

9·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。

10·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。