It is showed from vector analysis: N, P and K are deficient in poplar unfertilized and they are limiting factors to poplar.

矢量法营养诊断结果表明：未施肥的杨树各组织N、P、K均为缺乏状态，N、P、K是杨树生长的限制性因素。

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The limiting factors of the agricultural land use are found out based on the analysis of effect that is produced by environment resources.

本文以重庆喀斯特山地为研究对象，分析了当地资源环境条件对农业土地利用的影响，并对重庆喀斯特地区进行了分区；

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The results of stepwise multiple regression analysis show that OM, AK, AP, and CEC are the key tobacco quality-limiting factors.

逐步回归显示，土壤有机质、速效磷、速效钾和阳离子交换量对烟叶品质有较大的影响；

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