概述了国内外林地施肥的现状，简要论述了氮肥利用效率和水分利用效率在农林业生产中的意义。
This paper summarizes the status of fertilizing of wood land at home and abroad and introduces the concept and meaning of water use efficiency and nitrogen use efficiency.
减少对农业的要求，结合高等农业生产率，意味着没有选择，只能提高水分利用效率。
The decrease in the availability of water for agriculture, coupled with the requirement for the higher agricultural productivity, means that there is no option but to improve the water use efficiency.
对农业灌溉用水进行了探讨，从水分生产效率和水分利用效率来看，与发达国家相比都还有较大的差距。
Compared with developed countries, we still have a long way to go in water productivity and utilization ratio.
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