Nitrogen cycling in farmland ecosystem is one of the key factors to affect agricultural productivity and at the same time it affects the environment.
农田生态系统中的氮循环是影响农业生产力的主要因素之一，同时也会对环境产生影响。
Nitrogen and phosphorus are the necessary mineral nutrition to trees. They determine the growth of individual, the development of community and the productivity of ecosystem in the nature.
氮、磷是树木必需的矿质营养，在自然界中它们影响着树木个体的生长、群落的发育及整个生态系统的生产力。
Productivity, production technique and purification methods of nitrogen trifluoride are introduced at home and abroad, while the domestic and foreign market of it is analyzed and forecasted.
介绍了国内外三氟化氮的产能、制备技术及纯化方法，同时对国内外三氟化氮市场进行了分析和预测。
Leguminous plant has been thinking highly because its high protein content, good palatability, higher productivity, economic and high-performance nitrogen fixation is attracted increasing attention.
豆科植物由于其高的粗蛋白含量，良好的适口性，较高的生产力及经济有效的固氮价值越来越受到人们的重视。
Carbon and nitrogen cycles are very important to agricultural productivity and global climate stability.
碳氮循环对农业生产和全球气候稳定性而言，具有极其重要的意义。
The two factors affecting transplanted corn productivity were 1 density of planting and 2 a single application of nitrogen phosphate.
研究表明，移栽玉米只有合理配置种植密度和氮磷肥用量，才能获得高产。
The two factors affecting transplanted corn productivity were 1 density of planting and 2 a single application of nitrogen phosphate.
研究表明，移栽玉米只有合理配置种植密度和氮磷肥用量，才能获得高产。
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