摘要
ＣｒｏｐＹｉｅｌｄＲｅｓｐｏｎｓｅｔｏＷａｔｅｒａｎｄＦｅｒｔｉｌｉｚｅｒｉｎＬｏｅｓｓＴａｂｌｅｌａｎｄｏｆＣｈｉｎａ：ＡＦｉｅｌｄＲｅｓｅａｒｃｈＬＩＵＷＥＮ－ＺＨＡＯａｎｄＬＩＹＵ－ＳＨＡＮ（ＳｔａｔｅＫｅｙＬａｂｏｒａｔｏｒｙｏｆＳｏｉｌＥｒ...
This paper describes a field
research on crop yield response to water and fertilizer in Changwu tablelandof the Loess
Plateau. Under the current level of land management in this areai low fertility of soil is thefirst
yield-limiting factor and water deficit is the second. At a given fertility level, the relationship
betweencrop yield and its water consumption is parabolic. Within a certain range of soil
moisture, the soil wateravailability to crop is not sharply decreased with its markedly
decreasing content. Because of this relativelyhigh availability and the high reserve of soil
water at the early stage of crop growth, drought due to inadequateor poorly distributed rainfall
becomes less serious. High fertilizer input, improved crop variety and optimumcnltivation
techniqne can give a 50-100% yield increment of dryland crops in the loess tableland.
