Spray irrigation ·Spray radius:1-1.5m Discharge rate:20-250L/h
31 Spray irrigation • Spray radius: 1-1.5m • Discharge rate: 20-250L/h
Bubbler irrigation 。 Discharge rate:40-250L/h Bubblers and micro-tube Big hole 以
32 Bubbler irrigation • Discharge rate:40-250L/h • Bubblers and micro-tube • Big hole
1.2 Advantages and Problems of Micro Irrigation ·Advantages .Problems save water -sensitivity to clogging save energy -limiting root development save labor -high investment high uniformity high yield 一 good quality(easier control plant diseases and insect pests possible use of saline water better use of poor soils Dry soil high adaptability to terrain 33
33 1.2 Advantages and Problems of Micro Irrigation • Advantages – save water – save energy – save labor – high uniformity – high yield – good quality(easier control plant diseases and insect pests ) – possible use of saline water – better use of poor soils – high adaptability to terrain Dry soil •Problems –sensitivity to clogging –limiting root development –high investment
饱和半径 喷洒半径 千燥地面 滴头 微喷头 2积盐 2 湿润等深线 S流线 根区底部 Aw≈25ft2 ≥兰深层渗漏 Aw≈150ft2 34
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1.3 Components of Micro Irrigation water source 。 control head pump,filters, fertilizer applicator, control equipment and water meters 。pipe network emitters discharge and pressure regulators 35
35 1.3 Components of Micro Irrigation water source • control head – pump,filters, – fertilizer applicator, – control equipment and – water meters • pipe network • emitters • discharge and pressure regulators