Using two irrigation system techniques a drip water (Q1and Q2) (50% and 100%) respectively from irrigation system (in line) [(GR total water applied for both crops Bottle Gourd and 4L/50cm/h – 1.2bar)] and mini sprinkler (on line) [full circle stream (20Lph- broccoli. So; the total water apply are (2960.5 m3/fed) Two amounts of for Bottle Gourd and (1955.2m3/fed) for broccoli. diameter 0.9m -1.0bar)] Fig. (1). Fig.1 Layout of Experiment with for amounts of water and irrigation systems The total water applied calculated related to the Where; FAO (1998) and Drainage Paper #56: Crop IRn Net irrigation requirement, (mm/day). “Irrigation Evapo-transpiration: Guidelines for Computing Crop Etc Crop evapotranspiration,(mm/day). Water Requirements.” Further; Crop water requirement Peff Effective rainfall, (mm/day). and total water applied. Using an average Reference Evapo-transpiration (ETo) and the Crop coefficients IRt= IRn/Ea (3) (Kc) [table (4).] by the following equations. Where; ETc = ETo * Kc (1) IRt Total water applied (mm/day). Where; IRn Net irrigation requirement, (mm/day). Etc Crop Evapotranspiration (mm/day). Ea Overall irrigation efficiency for modern irrigation ETo Reference Evapotranspiration (mm/day). system (drip. Approximately (95%) and for surface Kc Crop coefficients. irrigation is (65 75%) (Phocaides, 2000). – IRn = ETc Peff (2) – Table 4. The average crop coefficients (Kc) for two crops. Bottle Gourd Item Init. Dev. Mid. Late. Total. Days 20 30 30 20 100 KC 0.6 1.0 1.0 0.8 Broccoli Item Init. Dev. Mid. Late. Total. Days 35 45 40 8 127 KC 0.7 1.05 1.05 0.95
Using two irrigation system techniques a drip irrigation system (in line) [(GR 4L/50cm/h – 1.2bar)] and mini sprinkler (on line) [full circle stream (20Lph- diameter 0.9m -1.0bar)] Fig. (1). Two amounts of water (Q1and Q2) (50% and 100%) respectively from total water applied for both crops Bottle Gourd and broccoli. So; the total water apply are (2960.5 m3/fed) for Bottle Gourd and (1955.2m3/fed) for broccoli. Fig.1 Layout of Experiment with for amounts of water and irrigation systems The total water applied calculated related to the FAO (1998) “Irrigation and Drainage Paper #56: Crop Evapo-transpiration: Guidelines for Computing Crop Water Requirements.” Further; Crop water requirement and total water applied. Using an average Reference Evapo-transpiration (ETo) and the Crop coefficients (Kc) [table (4).] by the following equations. ETc = ETo * Kc (1) Where; Etc Crop Evapotranspiration (mm/day). ETo Reference Evapotranspiration (mm/day). Kc Crop coefficients. IRn = ETc – Peff (2) Where; IRn Net irrigation requirement, (mm/day). Etc Crop evapotranspiration,(mm/day). Peff Effective rainfall, (mm/day). IRt= IRn/Ea (3) Where; IRt Total water applied (mm/day). IRn Net irrigation requirement, (mm/day). Ea Overall irrigation efficiency for modern irrigation system (drip. Approximately (95%) and for surface irrigation is (65 – 75%) (Phocaides, 2000). Table 4. The average crop coefficients (Kc) for two crops. Bottle Gourd Item Init. Dev. Mid. Late. Total. Days 20 30 30 20 100 KC 0.6 1.0 1.0 0.8 Broccoli Item Init. Dev. Mid. Late. Total. Days 35 45 40 8 127 KC 0.7 1.05 1.05 0.95
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