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The effects of Cu on rice at same level of N fertilizer were studied. 本文研究了微量元素铜在同样的氮肥量水平下对水稻生育的影响。
The results showed that irrigation and unit potash fertilizer input have significant impact on soil salinization. 单位耕地上灌溉面积越多，耕地发生盐渍化的概率也越高；
The larger irrigation area and potash fertilizer input per unit has,the higher soil salinization probability will be. 同时单位面积上钾肥使用量越高，耕地发生盐渍化的概率也越高。
The photoperiod characteristics played an important role in response to N fertilizer. 非光敏品种对高施氮量反应好，其最高产量需要更多的氮。
When combined at high rates, P and K consistently produced the best lint yields which were 87 to 98 kg/ha more than yields obtained with traditional fertilizer input amounts. 在高用量配合时，磷肥和钾肥总能获得最好的皮棉产量，这一产量比传统肥料投入量的高87~98公斤/公顷。
Dressing N fertilizer in flowering stage led to the decrease of glutelin content. 开花期追氮导致谷蛋白含量降低；
Applying N fertilizer during the R4 and R5 periods could increase the crop N-accumulation and yield significantly. 在 R4和 R5 期补充氮肥的供给明显增加植株对氮的积累，并能显著提高大豆产量。
The results showed that high nutrient use efficiency could also be obtained at high fertilizer input level when the comprehensive crop management techniques have been developed. 从区域、农户和吨粮田不同层次上的分析表明，高投入下可以实现高效率，关键是提高综合管理的科学水平；
Huang S M,Bao D J.Effect of N fertilizer application on nitrate content in soil and underground water[J].Agri-Environ.Prot.,2000,19(4):228-229. [19]黄绍敏;宝德俊.;施氮对潮土地下水硝态氮含量的影响[J]
The results showed that: the content of essential and total Aa. and etc. were increased significantly by applying N fertilizer in Tumochuan. 结果表明，在土默川地区，施氮肥后，必需氨基酸含量、酸性和碱性氨基酸含量及氨基酸总量极显著增加；
Because accumulation of photosynthate decreased, the increase in the N fertilizer made soluble sugar content in flag leaves reduce. 由于光合产物积累减少，增施氮肥使旗叶可溶性糖含量降低。
For example, farmers must make choices about managing N in legume production systems.These choices are complicated by the negative interaction between N fertilizer and BNF. 例如农户在豆类作物的氮管理上做出选择，由于氮肥和生物固氮之间的负相关而使选择变得复杂。
N fertilizer application in wheat significantly increased total N, ammonium N and nitrate-N contents in paddy field, resulting in high indigenous N supply of soil (INS). 结果表明，麦季氮肥的施用明显提高了稻季土壤全氮、铵态氮和硝态氮的含量，造成土壤背景氮偏高。
The results showed that the model of n fertilizer for Hard Wheat, higher in jointing than in seedtime and spike-time, was beneficial for high yield as well as quality. 研究结果表明，氮肥运筹以“前轻中重后补充”模式的产量品质俱佳；
Incorporating Chinese Milk Vetch into soil can reduce the chemical N fertilizer application rate by 44%, and also diminish the environmental risk of N runoff. 利用豆科紫云英轮作还田,可降低44%25的无机N肥用量,溶解性N浓度显著降低,是减小稻季N肥流失环境风险的有效途径。
It must be emphasized that performance of inoculant and the amount of N legumes derive from BNF is directly linked to crop management including application of N fertilizer. 必须强调的是，接种物的表现和豆类作物从生物固氮获得的氮量与包括施用氮肥的作物管理直接有关。
Li W B, Wu L S, Liao H Q.Application and crop recovery of N fertilizer in high-yielding paddy fields of Taihu region[J].Acta Pedological Sinica, 1997, 34 (1): 67 - 73. [19]李伟波;吴留松;廖海秋.;太湖地区高产稻田氮肥施用与作物吸收利用的研究[J]
The results showed that all factors were influent to soybean yield, while the influencing sequence from large to small is : soil mois ture >K fertilizer >N fertilizer> P fer... 结果表明,各因素对大豆产量均有影响,其作用大小顺序是:水分>钾肥>氮肥>磷肥,且钾肥是负效应。
Under conventional Irrigation and N fertilization management condition, the spatial variabilities in the water and N do not affect the winter wheat grain yield because of excessive water and N input. 在农民习惯的大肥大水条件下，由灌溉畦长引起的水肥田块空间变异未对冬小麦产量造成明显影响。
Nitrogen (N) fertilizer use efficiency can be improved by two ways, that is, optimized N fertilizer management and genetic improvement of nitrogen use efficiency (NUE) of crops. 摘要提高氮肥利用率依赖于氮肥优化管理及作物氮素营养效率的遗传改良。