世界范围内，相当一部分玉米种植在十分瘠薄的土壤上，氮素缺乏成为玉米生产最重要的限制因子之一。
In the world wide, most of maize was planted in poor soil, and nitrogen is one of most important nutrition elements for maize growing, especially for maize yield.
在干旱瘠薄山地，灌木保持水土、涵养水源、改善生态环境等方面具有乔木树种不可代替的作用。
In the arid and poor mountain lands, shrubs are used to conserve soil, water and headwater and to improve ecological environment, which can not be replaced by any tree species.
瘠薄河滩地整地质量的优劣，不仅影响林木的当年成活，而且还影响林木成活后的生长发育和连年生长量。
Site preparation quality in poor overflow land influences not only on survival rate of forest in the same year, but also on growth and annual increment after survival of forest.
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