Maize, as a high-efficient crop of high yield for the grain and feed, the cultivated area in the future should be further expanded.
玉米作为粮食和饲料兼用的高产高效作物，今后的种植面积应进一步扩大。
For a given rice variety, the crop harvest index, which is calculated by the grain yield divided by total dry matter produced above ground, may vary with crop management practices used.
对于给定的水稻品种，作物收获指数(由籽粒产量除以地上部分总干物重求得)可能随作物管理措施不同而变化。
Rice is the first cereal crop and contributes around 40% of the national grain production in China. The total yield and sowing area rank the first and second position in the world, respectively.
水稻是我国第一大粮食作物，占我国粮食40 %左右，其总产量与播种面积列世界第一、二位。
Leaf early senescence directly reduces its photosynthetic capacity, decreasing crop yield and grain quality.
水稻叶片早衰直接影响作物的光合效率，减少产量，降低品质。
Leaf early senescence directly reduces its photosynthetic capacity, decreasing crop yield and grain quality.
水稻叶片早衰直接影响作物的光合效率，减少产量，降低品质。
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