الفهرس 
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Abstract
The Objective of The Present Study, Is to Use the Agroclimatological Data, In Estimating the Water Consumptive Use for Potato Crop, Under the Conditions of El-Gharbya Area, And to Schedule for Potato Irrigation, Using the Evaporation Pan Records, Through Determining the Effective Evaporation Coefficient Which Give the Highest Yield, And the Best Water Use Efficiency. Also, The Word Aimed to Quantify the Effects of Irrigation Scheduling on Potato Yield and Quality. Two Field Experiments Were Carried Out at The Experimental Farm of The Faculty of Agriculture, At Tanta University of Tanta, During the Winter Plantation (Season 99/2000) And the Nili (Fall) Plantation (Season 2000/2001). Potato Tubers of Diamond Variety Were Sown On 5 Dec. 99, As Winter Cropping, And On 17 Oct. 2000, As Nili Cropping. Harvesting Was Generally Carried Out After 115 Days from Planting On 29 March 2000 and on 07 Feb., 2001 For Winter and Nili Plantation, Respectively. The Experiments Were Laid Down in A Complete Randomized Blocks Design with Four Replicates. The Experiment Included Seven Treatments Which Were Six Effective Evaporation Coefficients According to The Daily Evaporation Pan Treatments (Ef), 1.4, 1.2, 1.0, 0.8, 0.7 And 0.6 Besides to Conventional Irrigation Treatment, Which Represent the Farmer Practices in The Studied Area.