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Leaching and Accumulation of <img id='img_18043920' style='height:20px;' src='https://www.pwsannong.com/booklib/zpimage.zhtml?ID=18043920&SiteID=123&draft=0&type=norm&pm=y&fire=fire' onload='imgSize(this)' /> in Farmland of the Loess Plateau in China

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摘要

Between 34 to 40°latitude N and 102 to 114°longitude E locates the loess layer, which is 50 to 150m in depth. With an average rainfall of 450mm largely in July, August, and September, most areas are suitable only for single-crop planting once a year despite the fact that it is the biggest area for a