Soil organic matter and nutrients(e. g. nitrogen, phosphorus and potassium) play important roles in soil fertility.
土壤有机质和养分（氮、磷和钾等）是土壤肥力重要的物质基础。
This could be confirmed by the organic matter and nitrogen circulation and the improvement of soil fertility.
这可以从有机物质、氮素的循环和土壤肥力因素的改善得到证明。
The analytical data revealed that the potential fertility of the dryland soils was rather low, such as nitrogen, phosphorus and potassium content in soil were deficient on the whole.
分析数据表明，该区旱地土壤潜在肥力较低，有机质含量差异较大，大部分土壤氮、磷、钾养分供应不足。
The results showed that total nitrogen, available nitrogen and organic matter were the main fertility indicators for soil fertility evaluation in the planted forest land on the Loess Plateau.
结果表明，全氮、碱解氮和有机质是黄土丘陵区人工林土壤主要的肥力指标，其含量能更好地反映土壤肥力状况。
In low fertility soils, the effects of organic materials on soil microbial biomass nitrogen was rather apparent, about 4 times of high fertility soil.
土壤肥力不同，有机物料对微生物体的影响效果不同，在低肥力土壤上的效果突出，约为高肥力土壤的4倍。
The field experiments were carried out to evaluate the rice yields, economic benefits and soil fertility of ryegrass-rice and wheat-rice cropping systems under different nitrogen fertilizer rates.
通过田间试验研究了不同氮肥水平黑麦草—水稻和小麦—水稻两种种植模式的水稻产量、经济效益和对土壤肥力的影响。
Litterfall could evidently improve soil fertility, increase organic matter and total nitrogen, but decrease the total phosphor.
凋落物能明显改善土壤肥力，增加土壤有机质及全氮的含量，但与土壤全磷呈现负相关关系。
Effects of nitrogen rates on grain yield and quality of wheat in different soil fertility were studied.
在高、低两种肥力土壤下，研究了施氮量对小麦子粒产量和综合品质性状的影响。
By using rice varieties Wuxiangjing 14 and Wujing 15 as materials, the effects of nitrogen application on RVA profile characters under different soil fertility levels were studied.
以武香粳14和武粳15为材料，研究了不同地力水平下施氮量对稻米淀粉rva谱特性的影响。
By using rice varieties Wuxiangjing 14 and Wujing 15 as materials, the effects of nitrogen application on RVA profile characters under different soil fertility levels were studied.
以武香粳14和武粳15为材料，研究了不同地力水平下施氮量对稻米淀粉rva谱特性的影响。
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