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A field experiment was carried out in Al-Shahwan farms, Khatatba village, Sadat city, Menoufia governorate under sandy soil conditions with cucumber crop (F1-Faris). Uniformity parameters including emission uniformity, uniformity coefficient, distribution uniformity, manufacturing coefficient of variation, and emitter flow rate variation were measured for three types of emitters G, M, and T under 6, 8, 10, and 12m of water operating pressure head, in order to recommend an operating pressure head, that gives the best uniformity parameters which will be reflected on crop productivity. The power requirements for all treatments were calculated per unit area. The results showed that, better uniformity parameters will give better productivity. It is recommended to use 12m head for both M and T emitters, and 10m for G type. The T type gave the maximum crop productivity which reached 6.66 Mg/fed under 12m operating head. Increasing uniformity parameters led to increase the benefits of water unit as a result of increasing crop productivity.M type needed less power than the two other types but this affected the crop productivity. The maximum productivity gained under T emitter with 12m operating pressure head, compared with the maximum productivity of the other two types gave an increase of 6.7% and 12.5% compared to G and M types respectively. This will be faced by an increase of 63.8% of power requirement compared to M type, and a shortage of 6.9% of power requirement compared to G type. Increase of 6.7% of crop productivity and 12.5% for T type compared to the G and M types gave an increase in power source costs about 1.4% and 0.12%, respectively compared to the other two types. Electric power will save 63.6% of diesel fuel costs.

EFFECT OF OPERATING PRESSURE VARIATION ON UNIFORMITY PARAMETERS AND ITS IMPACT ON CROP PRODUCTIVITY AND POWER REQUIREMENTS OF TRICKLE IRRIGATION