الفهرس 
Introduction
Soil salinity distributionOnly 14 pages are availabe for public view
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Abstract
The aim of this study which was carried out at Sakha Agricultural Research Station, Kafr el-Sheikh Governorate is to determine the most suitable irrigation frequencies for pea grown under drip irrigation system. The irrigation treatments were based on cumulative pan evaporation (CPE) at different empirical pan factors (0.6, 0.8, 1.0, 1.2, 1.4 and 1.6 of CPE. Irrigation interval was based on available water = Ef * CPE. the main objective of this study: 1- Evaluating the hydraulic properties of the drip irrigation system. 2- Determine the most suitable irrigation interval for pea as a winter crop under drip irrigation system using class A pan evaporation. 3- Upgrade the pea crop water productivity in North Nile Delta region. 4- Determine the effect of irrigation scheduling on soil-water, soil solutes and soil temperature distribution under and around the emitters. The main results indicated that: 1. The implemented system of drip irrigation in this study can be classified as very good from manufacturing coefficient (CV), Uniformity coefficient (UC), Distribution Uniformity (DU) and emitter flow rate (qvar). The mean corresponding values are 13.95, 96.7, 84.35 and 36.72%, respectively. 2. A highly significant variation between treatments in the amount of applied water. The highest mean (1156.63 m3/fed) was obtained when irrigation was done at Ef 1.0 and the lowest amount of applied water (1097.83m3/fed) was obtained when using Ef 0.8. 3. The highest mean fresh seed yield in the two seasons (1066.5 kg/fed.) was obtained when irrigation was done at Ef 1.6 and the lowest fresh seed yield (507.5 kg/fed.) was obtained when we use Ef 0.6. 4. Reducing the irrigation interval through empirical factor (Ef) 0.6 to 1.6 has a highly significant effect on fresh seed yield although no significant variation between treatments in amount of applied water. The highest mean fresh seed yield at the two seasons (1.066.5 ton/fed.) was produced when irrigate at Ef 1.6 and the lowest fresh seed yield (0.5075 ton/fed.) was resulted when using Ef 0.6. 5. The mean values of Crop water productivity (CWP) for pea decreased by increasing irrigation intervals. The highest Average (0.91 kg m-3) was resulted from irrigation at Ef 1.6. While, the lowest value (0.46 kg m-3) was produced from irrigation at Ef 0.6. 6. A homogeneity soil-water, salinity and temperature distribution in soil profile which resulted from the convergent water supply. This was occurred by watering at short irrigation intervals (irrigation at Ef 1.2, Ef 1.4 and Ef1.6) which are about 3-4 days for pea crop.