Therefore, straw mulching is an efficient measure to maintain and improve the regime of soil nitrogen nutrition.
因此，秸秆施用是保持和提高土壤氮素营养的有效措施。
The objective of this study was to evaluate the effects of nitrogen nutrition on water status and photosynthesis in wheat under soil drought.
轻度土壤干旱下，小麦叶片仍能维持较好的水分状况，高氮营养对叶片光合作用有明显的促进作用。
The results showed that lime soil supplied the plants with more nitrogen nutrition, less phosphorus and potassium nutrition.
结果表明，石灰岩类土壤提供给烟株吸收利用的氮养分较多，而磷钾养分较少。
Purple soil supplied the plants with more phosphorus and potassium nutrition and less nitrogen nutrition.
紫色类土壤提供给烟株吸收利用的磷钾养分较多，而氮养分较少。
In the world wide, most of maize was planted in poor soil, and nitrogen is one of most important nutrition elements for maize growing, especially for maize yield.
世界范围内，相当一部分玉米种植在十分瘠薄的土壤上，氮素缺乏成为玉米生产最重要的限制因子之一。
The experiments results show that the effect of alternative freezing and thawing has a great influence on the organic matter, nitrogen nutrition, potassium nutrition and soil enzyme activities.
研究结果表明，冻融交替作用对黑土有机质、氮钾及酶活性产生重要的影响。
The experiments results show that the effect of alternative freezing and thawing has a great influence on the organic matter, nitrogen nutrition, potassium nutrition and soil enzyme activities.
研究结果表明，冻融交替作用对黑土有机质、氮钾及酶活性产生重要的影响。
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