搜索结果: 1-1 共查到“经济学 Cycling”相关记录1条 . 查询时间(0.062 秒)
Global Economics of Nutrient Cycling
Crop production economics land requirement livestock manure nutrient cycling
2009/1/8
This paper briefly discusses global human requirements of protein nitrogen (N) from crops and animals, and then estimates the need for fertilizer N as a function of N use efficiency, and the recycling...