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Effect of Variable Nitrogen Application Based on Spectral Index on Winter Wheat Grain Yield and Economic Benefits 基于光谱指数的变量施肥对冬小麦产量构成的影响及其效益分析
Variable nitrogen application 变量施肥
Plant density have higher effect on ear characters than nitrogen application. 密度比施氮量对果穗穗部性状的影响更大些。
Nitrogen application and NDSA fertilization had slightly effect on the soluble sugar content in celery,but DCD could significantly increase it. 施氮和NDSA施肥法对芹菜可溶性糖影响不大,但添加DCD可明显增加芹菜的可溶性糖含量。
Effects of the amount of nitrogen application on petunia, pansy, daisy and Anthurium. 对4种花卉进行氮素生理试验，目的是初步了解矮牵牛、三色堇、雏菊、安祖花对氮素的养分需求；
When nitrogen application amount was 180 kgN/ha,ear number could increase with the increase of basic seedling number. 在施氮量180 kg/ha条件下,增加基本苗,穗数相应增加。
Figure1 exhibits that there are two peak period of N uptake by both of traditional and modified nitrogen application methods. 从图1看出传统施氮方法和改良方法都有两个吸氮高峰期。
Table 2 also shows that a change in the level of nitrogen application affects the MPP of potash use for any given level of potash use. 表2又表示在钾的各个用量水平，氮肥用量的变化对钾肥边际产量的影响。
For a nitrogen application of 225kg/ha, however, jute yields initially experience increasing marginal returns to potash application. 而在氮用量为225公斤/公顷时，黄麻产量起初对钾用量出现边际报酬递增。
The total starch and amylopectin contents of the high starch sorghum hybrid were high under medium nitrogen application. 高粱子粒中直链淀粉、支链淀粉和总淀粉含量均随子粒灌浆过程的推进呈不断上升的趋势。
Zhang J W, Wang K J, Hu C H, Dong S T, Liu P.Effects of different nitrogen application stages on forage nutritive value of summer maize. 张吉旺;王空军;胡昌浩;董树亭;刘鹏.;施氮时期对夏玉米饲用营养价值的影响
The effect of nitrogen application on HMW-GS expression with protein composition differed among subunit type of high quality wheat. 施氮后，高分子量谷蛋白亚基表达量与各项加工品质指标呈正相关；
As an example, when potash use is between 75kg/ha and 150kg/ha, an increase in nitrogen application from 150 to 225kg/ha increases the MPP of potash from 11.4 to 23.1. 例如，当钾肥用量为75~150公斤/公顷时，氮肥用量由150公斤/公顷增加到225公斤/公顷使得钾肥的边际产量由11.;4增至23
Under higher level of nitrogen application (N:P:K=3:1:1), Phalaenopsis amabilits showed heavier fresh weight and dry weight, longer and wider scape, and the most leaves. 氮、磷、钾比例为3:1:1（高氮）条件下，蝴蝶兰植株的叶片数最多，鲜重、干重较重．花茎长且粗；
Under the same nitrogen application rate,higher topdressing ratio improved nitrogen agronomic efficiency,nitrogen recovery efficiency,increased accumulation amount of topdre... 因此合理运筹氮肥是提高氮肥利用率、增加产量、改善品质和减少污染的重要措施。
In order to overcome above problems,we used GreenSeeker to decide the amount of nitrogen application in wheats at jointing stage based on spectrum of chlorophyl. 试验结果表明,该技术不仅可以减少氮肥施用量,而且可以明显增加小麦籽粒产量和氮肥利用率,提高小麦生产的经济效益。
Liu W D,Wang H C,Yang Q H et al.Effect of nitrogen application on the productivity of winter wheat under soil water deficit[J].Chin.J.Soil Sci.,2002,31(6):262-264. [6]刘万代;王化岑;杨青华;等.;施氮对土壤水分亏缺下冬小麦生产力的影响[J]
Took Huaimai19 and Yannong19 as materials, the effects of nitrogen application rate on RVA profile characters under different land fertility levels were studied. 摘要为给小麦优质栽培提供理论依据，以淮麦19和烟农19为材料，研究了地力水平、施氮量对小麦淀粉RVA特性的影响。
The results suggested that appropriate irrigation model and nitrogen application method could enhance NUE, increase rice yield and save water effectively. 研究表明，采用合理的灌溉和施肥，能有效地提高氮肥利用率、增加水稻产量，并节省灌溉用水。
A constant, variable, function name, or expression. 一种常数、变量、函数名或表达式。