To raise grain yield it is necessary to increase the investment in agriculture and to ensure proper scale of growing area under grain crops.

要增加粮食产量，必须增加对农业的投入，保持适度规模的粮食种植面积。

youdao

The country should import more grain in order to raise more livestock, and devote its own land to the more profitable business of growing cash crops for export.

ECONOMIST: China

That's because grain prices also are strong, and also because cotton is an expensive and labor-intensive crop to raise.

WSJ: Farm Economy Bounces Back