Proper combination of simple extraction and circulation extraction can increase yield and extract concentration simultaneously on the basis of assurance efficiency.
将简单提取和循环提取适当组合能够在保证效率的基础上使收率和提取液浓度有较大提高。
The experimental result shows that application of conservation tillage in North China Plain is benefit to saving water, enhancing water use efficiency and increase crop yield.
试验结果表明，我国华北地区实施保护性耕作有利于节约用水，提高水分利用效率，增加作物产量。
There are three factors, input factors, technical improvement and technical efficiency, influence the increase of maize yield.
影响玉米单产增长的诸多因素大概可以归纳为三类，一是要素投入，二是技术进步，三是技术效率。
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