The study of nitrogen balance in stock farming system is the basis of nutrient management in animal husbandry production, and the determination of N cycling parameters is the foundation of this study.

畜牧系统中N流动与平衡的研究是畜牧业进行养分资源管理的基础，而参数的确定又是研究养分循环与平衡的基础工作。

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Late last year, for example, somebody got interested in a forlorn little stock called Autolend Group, an Albuquerque, N.

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