覆膜旱作水稻需水规律试验研究

Water Requirement of Dryland Rice under Plastic Film mulch

依据覆膜旱作水稻需水量试验资料 ,分析了节水高产技术条件下水稻各生育阶段和月旬的需水量、需水强度、模比系数及其变化规律。结果表明 :与浅湿晒灌溉 ( CK)相比 ,覆膜旱作水稻蒸发蒸腾量减少 1 95.9mm( 2 9.94 %) ,需水强度减少 1 .7mm/d,比现有水稻节水灌溉技术更节水。模比系数变化更符合水稻高产特点 ,水分利用更趋合理。

According to experimental data for water requirement of Dryland rice under plastic film mulch(DRPFM), crop water requirement, water use rate and modules in different growth stages, months and in different ten day periods are analyzed. Compared with the data from paddy rice cultivated under 'Shallow moistened sunbaked' irrigation system, (fields are covered with shallow water layer in early stages, and moistened or sunbaked intermittently in later growing stages according to water requirement and water supply conditions, refered as CK), average evapotranspiration and water consumption rate under DRPFM reduce 195.9 mm (29.94%) and 1.7 mm/d respectively. These results provide a scientific basis for extending the water saving and yield raising technique of DRPFM.