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。
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