Determined of water requirements for vegetables under drip irrigation system [electronic resource].

Includes references.

This work aims to calculate of water requirements for squash under drip irrigation in sandy soil at Al-Moulak area, Ismailia Government, Egypt. The average yield was 11.6 ton/fed for squash. The total water requirements was 379 mm (1591.8 m3 I fed), The average of temperature of28- 32 °C in daily and in night of 16-18 °Cat the average of relative humidity of 62 %. The relationships between water requirement (E, mm/day) and deficits relative humidity ( ds, mb) having thefollowingformula: ? =adsb Where, a, b - empirical coefficients of the regression equation. At using experimental data through the season of Squash. That equal a = 1.89 and b = 0.64 then the relation become (? = 1.89 ds o.u) and the correlation coefficient was 0.94 + 0.0435. This means that in 94% of the water consumption of Squash variations in these conditions due to variations in deficit air humidity. For calculating Squash water requirement under drip irrigation was found as ? = ? / Kc ? ds 6 considering ? F - Coefficient depending on wetting pattern in 1 m2 under dripper and ? c - Crop coefficient. The experimental data during calculation the crop coefficient of Squash through growth season was found as '? c = 0,3565 + 1,685l*tr 0,1455*tr 2 considering tr as relative time.

Summary in Arabic.

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