a值法自动灌溉系统研究

Abstract Aiming at the situation of shortcomings of the traditional artificial irrigation system and the low efficiency of irrigation water the paper discusses the application of 琢value method automatic irrigation system. This system is taking the suitable soil moisture content ofthe crop as upper and lower limit by evaporating dish water level monitoring soil moisture content changes regulates electric butterfly valveswitch to supply water to irrigated area takes irrigation timely and improves irrigation efficiency.院琢值法 灌溉系统 自动控制Key words 琢value method irrigation system automatic control中图分类号院TP273 文献标识码院A 文章编号院1006-4311（2014）01-0081-021 研究背景与意义1.1 我国农业灌溉用水现状我国是一个严重缺水的国家，人均水资源占有量仅为世界平均水平的1/4，水资源人均占有量将继续下降，加之水资源污染严重 水质恶化的同时，而农业是用水大户，近年来农业用水约占全国用水总量的62%，部分地区高达90%以上，但是农业用水浪费相当严重，灌溉水和自然降水利用率低，农业用水效率不高，区域缺水问题已经显现出来。