对三熟制早稻用氮素化肥作穗肥进行了研究。
Application of nitrogenous fertilizer to early rice at the ear primordia stage under the triple-cropping system was studied.
施用氮素化肥对蔬菜中硝酸盐的累积影响很大。
Nitrogen fertilizer application has a great effect on nitrate accumulation in vegetables.
今后农田施肥，应当重视施用有机肥，控制氮素化肥用量，增加磷素养分比例，适当补施钾肥。
For the future we should attach importance to organic fertilizer on farmland, control the dosage of nitrogen fertilizer, increase the proportion of phosphorus and add kalium fertilizer properly.
试验结果表明：施用氮素化肥能明显改良小麦品质，提高小麦营养品质，增强面团强度和筋力，降低面团的延展性；
The results showed that N fertilizer could improve the nutrition quality of wheat, increase paste strength and flexibility, but decrease paste ductibility.
化肥，特别是化肥中氮素，在施用过程中有部分流入到环境中去，对环境造成污染。
When chemical fertilizers are applied to the fields, part of them passing into the environment, particularly nitrogen fertilizers, and leads to pollute environment.
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.
农田生态系统中氮素养分主要的输入项是化肥和有机肥，分别占总投入氮量的58.8%和25.3%。
The major input of N was the N of fertilizer and manure and the percentage was 58.85% and 25.32% of the total input respectively.
农田生态系统中氮素养分主要的输入项是化肥和有机肥，分别占总投入氮量的58.8%和25.3%。
The major input of N was the N of fertilizer and manure and the percentage was 58.85% and 25.32% of the total input respectively.
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