宁夏南部雨养农业区玉米生育期土壤含水率控制阈值研究

在宁夏南部雨养农业区,设置玉米不同生育期土壤含水率控制下限指标,开展以土壤含水率为灌溉控制指标的精量灌溉技术试验研究。在分析玉米各生育期灌水量、土壤含水率、作物产量、水分利用效率的基础上,推荐在丰水条件下,玉米生育期土壤含水率控制阈值为:种植期80%θf、苗期—拔节期55%θf、拔节期—抽雄期85%θf、抽雄期—灌浆期80%θf,水分生产效率可达3.35kg/m3。宁夏南部雨养农业区推荐土壤含水率控制阈值为:种植期60%θf、苗期45%θf、拔节期50%θf、抽雄前期60%θf,水分生产效率可达3.7kg/m3。

Southern Ningxia Rainfed Agricultural Regions Maize Growth Stages of Soil Moisture Content and Control Threshold Research

In southern Ningxia rainfed agricultural regions,the experiments of the precise irrigation technology were carried out,which took the soil moisture content of corn as control index lower limit in different development stages.On the analysis of irrigation water amount of corn in the various growth,soil moisture content,crop yield and water use efficiency,control threshold of soil moisture content was recommended that planting period 80%,seedling to jointing stage 55%,jointing stage to tasseling stage 85%,tasseling to filling stage 80% of field capacity,and water production efficiency may reach 3.35 kg/m3 under rich water condition.Soil moisture content and control threshold in southern Ningxia rainfed agricultural regions were recommended that planting period,seedling,jointing stage and the tasseling were 60%,45%,50%,60% of field capacity,and water production of efficiency may reach 3.7 kg/m3.