It is of great importance to study the growth and nitrogen(N) uptaking by cotton for optimizing soil salinity, irrigation and fertilization strategies with drip irrigation under film.
在膜下滴灌条件下，进行了不同氮肥滴灌施肥方式和土壤盐度对棉花生长和氮素吸收影响的田间试验。
Reducing N and P rates also decreased N and P accumulation and nitrate content in the soil and decreased the risk of N and P running off.
减少氮磷化肥用量可以大幅度降低氮磷在土壤中的累积和硝酸盐的含量，减少氮磷的流失风险。
To investigate the changes of soil hydrolase activities under application of corn straws with manure, N and P fertilizer, a field experiment was conducted.
通过田间试验，进行了玉米秸秆与厩肥、N肥和P肥配合施入农田后土壤中水解类酶活性变化的研究。
Leaf N/ chlorophyll content and SPAD value increased with the increasing N fertilizer, and the lower leaves were more sensitive to the soil N supply than the upper leaves.
下位叶比上位叶对土壤氮的供应状况更为敏感，随着施氮量的增加，水稻叶片氮素含量、叶绿素含量、SPAD值相应的增加，而下位叶的增幅更明显。
The zone change of soil microbial biomass C and N from north to south was not distinct.
土壤微生物量C、N从北到南的地带性变化规律不强。
Results showed:The soil organic carbon, nitrogen and microbial biomass C? N of different kinds of wetlands were obviously differences, and decreased with increasing depth at profiles.
结果表明：不同类型湿地土壤碳、氮和微生物C、N有明显差异，而且均随深度的增加而降低。
The relationship between mineralizable soil N and crop N uptake was studied under the condition of pot and field experoments respectively.
在盆栽和田间条件下，研究了作物吸氮与土壤可矿化氮的关系。
The sustainability index indicated that, the sustainability of soil N was much more dependent on chemical fertilizer input, while P and K were relied on organic fertilizer.
之间；通过可持续性指数的分析得出，土壤N素养分的可持续性对化肥的依赖性较大，而P、K养分的可持续性则对有机肥的依赖性更高。
In order to study the relationship between yield, maize ear treats and organ matter, N-OH, available P and K, we selected field block with different soil nutrition in Mei county, Shaanxi province.
在陕西眉县选择农田土壤养分含量不同的地块，研究不同含量的有机质，碱解氮、速效磷、速效钾与玉米果穗穗部性状及产量的关系。
The results show that the release amount of N increases in the soil when temperature goes up , and the release period shortens when the release speed is up.
结果表明，温度升高，土壤中速效氮释放量增大，释放速度加快，释放周期缩短。
The quantity of crop nutrients transferred from the system, and the nutrient budget of N, P and K in soil were studied.
研究了在养分循环再利用的基础上采取不同施肥制度下作物养分移出量，并结合施肥量计算出土壤中N、P、K养分收支。
The N in the SOM existed mainly in the form of organic nitrogen, and the soil C:N was significantly correlated with SOM.
土壤中的氮素主要以有机氮的形式存在于土壤有机质中， 土壤碳氮比与有机质含量显著相关。
The influence of application of organic and nitrogen fertilizer on the content of alkali hydrolysable N in fertilities soil was studied.
对设施土壤中长期施有机肥与氮肥对土壤中碱解氮含量的影响进行了研究。
N deposition can acidify the soil and leaching the exchangeable base cations.
氮沉降能引起土壤酸化，同时造成土壤盐基离子淋失。
The relationship between soil total N content and soil reflectance was analysed.
利用航天遥感影像，分析了影像光谱值与土壤总氮含量之间的关系。
Soil organic matter, soil porosity, availible N, Zn, Fe, Mn and enzyme are all positively related to the amount of straw applied remarkably, while soil specific weight is negatively correlative.
土壤有机质、孔隙度、速效氮、锌、铁、锰、酶活性等理化指标与秸秆还田量呈显著正相关；
Soil microbial biomass carbon, nitrogen and its C/N ratio are the important biological indicators characterizing soil quality.
土壤微生物生物量C和N及其C/ N比是反映土壤质量的重要生物学指标。
Results show that the proper application of black liquor of papermaking can improve the soil properties and increase the contents of organic materials, N and K in soil.
结果表明，造纸黑液适量施用能改善土壤物理性状，增加土壤有机质含量和氮、钾含量；
To find out the relationship between soil microbial biomass C and N and soil fertility, soil microbial biomass C and N were compared in several types of soil with different fertilization levels.
通过对不同肥力水平黑土、棕壤、黄棕壤、红壤土壤微生物量碳氮的比较，研究和探讨土壤微生物量碳氮与土壤肥力的关系。
It also shows that the growth of plantation is greatly affected by the content of soil nutrients specially total n, total K and soil organic matter.
林分生长与林地土壤中全n、全k以及有机质等养分的含量显著相关。
The results showed that all the 4 species of plants improve greatly the organic C and total N in soil with microbial biomass accumulated much more and soil enzyme activity improved.
结果表明，4种固沙植物均能明显改善土壤C，N水平，提高微生物生物量，改善土壤酶的活性。
The results indicated that: the soil moisture remarkably influenced N, P, K nutrition uptake.
结果表明：土壤水分对旱稻吸收N、P、K矿质元素有明显影响。
The concentrate of ammonium-N fluctuated in soil surfaceand decrease as the delay of soil drying.
土表的铵态氮也呈波动变化，随着烤田时间的增加铵态氮含量降低。
Soil column method was used to study the characteristics of the movement, transformation, and leach of urea-N in soil added by different ways of the fertigation.
采用室内土柱模拟试验方法，研究了不同灌溉施肥方式下尿素态氮在土壤中的迁移、淋溶和转化特征。
The concentration of nitrate-N increased continuously in soil surface, which resulted in nitrate leaching to groundwater after rewetting.
土表的硝态氮浓度不断增加，烤田增大了复水后硝态氮向地下水淋溶的趋势。
Spore density was also significantly correlated with soil available n.
孢子密度与土壤速效氮呈显著正相关。
Sewage Sludge on the Contents of Organic Matter, Total n, Total P, and Total K in Calcareous Immature Soil and Calcareous Mellow Soil.
通过盆栽试验研究了不同用量污泥对石灰性生土和熟土有机质和全氮、全磷、全钾含量的影响。
Results showed that long term application of NPK fertilizers or manure could increase soil biomass-N, especially the effect of manure on biomass-N was obvious.
结果表明，长期施用有机肥或化肥均能增加土壤生物量氮数量，尤以有机肥的作用明显。
Application of N fertilizer significantly increased the amount of residual nitrate-N, and affected its distribution in the soil profile.
施用氮肥可明显增加土壤硝态氮残留数量，并影响其剖面分布；
In order to approach a high efficient way of utilizing technical lignin, a study on influence of N-modified lignin on soil biochemical properties was conducted in this paper.
文章通过氮修饰木素对土壤生化特性影响的研究，旨在探索工业木素资源的高效利用途径。
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