结果表明，该区域土壤有机质、全氮及各形态氮素含量呈现先降后升的趋势。
The result shows that the content of soil organic matter, total nitrogen and different forms nitrogen decreased firstly, then increased by time pasted.
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 N in the SOM existed mainly in the form of organic nitrogen, and the soil C:N was significantly correlated with SOM.
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。
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.
有机肥施用达到一定量后可以提高土壤中氮素含量，而化肥对于土壤氮素提高不明显。
Enough manure application could improve soil nitrogen content, but chemical fertilizer contributed less to soil nitrogen level.
且土壤有机质、全氮、酸水解性总氮、氨基酸态氮和碱解氮含量按照石漠化程度的由轻度到极强度而呈递减趋势，但土壤其他氮素含量并未表现相同的变异规律。
Compared with Karst no-Rocky Desertification soil, the content of soil Organic Matter and Nitrogen in various degrees of Karst Rocky Desertification shows a tendency to drop suddenly.
土壤中硝态氮和铵态氮的含量直接影响着作物的生长和品质。通过田间试验研究了不同有机肥料氮素在土壤中的转化及其对草莓生长和果实品质的影响。
A field experiment was conducted to investigate the nitrogen transform of different organic manures in soil, and its effects on the growth and quality of strawberry.
高于湖南省以北地区土壤和本地区地带性土壤—红壤的固定态铵含量，是该地区的一项重要的土壤氮素资源。
The contents of fixed ammonium were higher than those in soil of North Hunan region and in soil of red earth region , and were a main N resource in the province.
在本文特定作物和土壤条件下，增加灌溉原污水中的有机碳含量将不利于污灌系统对氮素的去除。
Under the conditions of this experiment, the increase of additional organic carbon content is not in advantage of the removal of nitrogen in waste water irrigation system.
在本文特定作物和土壤条件下，增加灌溉原污水中的有机碳含量将不利于污灌系统对氮素的去除。
Under the conditions of this experiment, the increase of additional organic carbon content is not in advantage of the removal of nitrogen in waste water irrigation system.
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