干旱区不同灌溉量下棉田土壤碱解氮剖面分布

目的]明确水分如何影响肥料效应的发挥对于制定强调恰当的水肥调控技术非常重要.方法]在新疆阿瓦提县进行田间试验,研究地面灌溉不同灌溉量下棉田土壤剖面上碱解氮时空分布特点.结果]地面灌溉明显的影响100 cm深度土壤碱解氮含量变化,尤其0～40 cm土壤碱解氮含量变幅很大;基本上是灌水量越大,碱解氮被淋溶到下层的量就越大.结论]"以水促肥"效应的一部分原因是灌水扩大肥料在土壤垂直方向分布范围,使更多的棉花根系可以吸收养分.

Sectional Distribution of Alkaline - hydroluzale Nitrogen of Cotton Field Soil under Different Irrigation Water Supply in Arid Area

【Objective】To reveal how water affects fertilizer is important to make decision to regulate and control water and fertilizer use.【Method】The paper discribed temporal-spatial character of soil N extracted by alkaline affected by different irrigation water usage in Awati County,Xinjiang.【Result】Irrigation resulted in change of soil N content in depth from 0 cm to 100 cm obviously,especially from 0 cm to 40 cm;generally the more water irrigated,the more nitrogen dissolved and moved down.【Conclusion】One reason that water promoted fertilizer use efficiency was to enlarge distribution area of nitrogen in soil profile,then more cotton roots could adsorb nutrients.