Water quality - determination of selected organic nitrogen and phosphorus compounds - gas chromatographic methods 水质.所选定的有机氮和磷化合物的测定.气相色谱法
The simulation on mineralization of soil organic nitrogen and nitrogen release from organic materials applied to the fields 土壤有机氮矿化与有机物氮素释放的动态模拟
Water quality - determination of selected organic nitrogen and phosphorus compounds - gas chromatographic methods 水质.所选用的有机氮和磷化合物含量的测定.气相色谱法
Change of non - exchangeable ammonium nitrogen in the process of organic nitrogen mineralization of typical soils on loess plateau 黄土高原典型土壤有机氮矿化过程中非交换性铵态氮的变化
So the pool of soil organic matter in soil become bigger anci bigger under no tillage while smaller and smaller under tillage 所以长期的覆盖免耕使有机氮库越来越大，传统耕作下有机氮库则变得越来越小。
Water quality - determination of selected organic nitrogen and phosphorus compounds - gas chromatographic methods iso 10695 : 2000 ; german version en iso 10695 : 2000 水质.所选有机氮和磷化合物的测定.气相色谱法
The graph shows the marked reduction of total kjeldahl nitrogen i . e . ammonia and organic nitrogen arising primarily from livestock waste in the siu lek yuen nullah from 1989 附图表显示小沥源明渠自1989年以后凯氏氮总含量主要来自禽畜废物产生的氨及有机氮显著减少。
Most of the common nitrogen source could be used by cds - 1 except nano2 & carbamide , but organic nitrogen source was better than inorganic nitrogen source in supporting the growth of cds - 1 该菌可以利用多种常用的氮源物质，但是不能利用nano _ 2与尿素；对有机氮的利用要明显优于无机氮。
6 . the irrigation using polluted water with high organic matter and tn is good for plant growing and environmental improvement , and the clear water for irrigation is not economic 洁水灌溉是不经济的，农田对于高浓度有机氮污水有很好的降解和吸收养分的功效，用不含重金属和有毒物的污水进行灌溉有助改善环境。
Not only could n ' t the quantity of soil organic matter and organic n be lifted up , but also did it lead , to soil erosion and output declining under nc - ti ! ! age system without crop residue adding 实行免耕制，关键是有机残体的返还。研究表明，一旦免耕与覆盖分离，则免耕即不能提高有机质和有机氮水平，导致土壤退化和减产。
