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Crop Yield Response to Water and Fertilizer in Loess Tableland of China: A Field Research

作者：

LIU WEN-ZHAO;LI YU-SHAN

单位：

;State Key Laboratory of Soil Erosion and Dryland Farming on Loess Plateau, Northwest Institute of Soil and Water Conservation, Chinese Academy of Sciences, Yangling 712100 (China)

关键词：

grain yield;loess plateau;soil fertility;soil moisture

摘要：

This paper describes a field research on crop yield response to water and fertilizer in Changwu tableland of the Loess Plateau, Under the current level of land management in this area, low fertility of soil is the first yield-limiting factor and waterdeficit is the second. At a given fertility level, the relationship between crop yield and its water consumption is parabolic. Within a certain range of soil moisture, the soil water availability to crop is not sharply decreased with its markedly decreasing content. Because of this relatively high availability and the high reserve of soil water at the early stage of crop growth, drought due to inadequate or poorly distributed rainfall becomes less serious. High fertilizer input, improved crop variety and optimum cultivation technique can give a 50—100% yield increment of dryland crops in the loess tableland.

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Crop Yield Response to Water and Fertilizer in Loess Tableland of China: A Field Research

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