A few proposals on the way of controlling nitrate con tent and increasing yield of vegetable and the direction of research in the future were put forward.
针对控制蔬菜硝酸盐含量，提高产量的途径及今后研究的方向提出了建议。
The yield increasing results and proportion of each mixing way have been achieved.
并得出了不同品种混种、混插方式的增产效果与增产比例；
So, We think the effect way of increasing maize yield is to increasing it's source and sink.
由此认为要进一步提高玉米产量，应增源扩库。
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