per unit area grain yield

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。

We will effectively keep the area planted with grain crops stable, focus on increasing the yield per unit area and optimizing the variety mix, and increase the country's grain production capacity.

我们要切实稳定种植面积，着力提高单产，优化品种结构，推进全国新增粮食生产能力建设。

Increasing yield level per unit area is forever theme for rice breeding aim, and advancing photosynthesis efficiency is one of key factors for improving grain yield.

提高单位面积的产量是水稻育种目标永恒的主题，提高光合作用效率又是提高产量的关键因素。