宁南旱区春小麦覆膜穴播栽培决策研究

Cultivation technique decision on plastic mulching and hole sowing of dryland spring wheat in arid areas of South Ningxia

对宁南旱区春小麦覆膜穴播条件下土壤水分与产量的关系及技术决策进行了分析。结果表明 :覆膜与露地条件下 ,春小麦产量与底墒之间均呈线性关系 ;在试验年份生育期降雨 1 43.0 mm情况下覆膜增收的临界土壤墒情为 2 82 mm,春小麦生育期不同降雨年型 (丰 :R>1 30 mm,平 :70 mm<R<1 30 mm,亏 :R<70 mm)覆膜增收的临界墒情为 2 90mm,2 90～ 350 mm和大于 350 mm,据此提出了覆膜栽培决策建议。

The relation between soil moisture and spring wheat yield and the technique strategy on plastic film covering and hole seeding is analyzed in this paper.In the condition of covered and exposed treatment,regressive analysis on the relation between spring wheat yield and basis soil moisture shows both are linear.Further analysis shows that,in the condition of film mulching,the critical content of soil moisture which can result in income increasing is 282 mm in the test year.The different critical contents of different precipitation from March to June (plenty: R >130 mm,normal 70 mm≤ R ≤130 mm,shortage: R <70 mm) are 290,290-350 and over 350 mm,respectively.Cultural decision is made in accordance with these basic conclusions.