THE effect of the off-time period OF in surg errigation on the on the application efficiency and water distribution uniformity

Abstract: The current study was carried out during season 1999 in clayey soil aiming to improve surface irrigation methods, using surge flow irrigation with different off-time periods compared with the continuous flow through perforated pipes. The four treatments of surge flow were (10-10 min), (10-20 min), (10-30 min) and (10-40 min) (on time, off-time) compared with the continuous flow. The results showed that the cumulative infiltration rates for 10,20,30 and 40 min off-time were reduced by 40.74%, 47.26%, 49.75%, and 50.74 % compared with that of the continuous flow. Also, the cumulative infiltration rates for 20,30,and 40-min off- time were reduced by 10.92%, 15.1%, and 16.8% compared with that of the 10-min off- time. The water losses by deep percolation were 10.5 cm for the continuous flow while it was 5.5, 3.28, 2 .64 and 2.3 cm for surge irrigation for off-time 10,20,30 and 40 min. respectively. The surge flow with 10,20,30.and 40-min off- time reduced the total advance time by 24.9%, 36%, 39.29, and 41% respectively compared with that of the continuous flow. Also, the total advance time for 20,30,and 40-min. off- time was reduced by 14.84%, 19.14%, and 21.48 % compared with that of the 10-min. off- time. The water distribution uniformity was determined for the continuous flow and the surge flow for surge irrigation off time 10,20,30 and 40 min. The values of distribution uniformity were 55%, 70%, 77.69 %, 79% and 79.9% respectively. The values of the application efficiency were 47.5%, 63.3, %, 74.3 %, 77%, and 80.5 % for the same treatments respectively. This means that by increasing the off-time period from 10min. to 40 min., the irrigation efficiency increased too. So it is better to use off time period of 40 min,. to increase the pervious parameters.
Publication year 2000
Availability location مكتبة كلية الزراعة جامعة الازهر
Availability number
Organization Name
City القاهرة
serial title المجلة المصرية للهندسة الزراعية
Department On farm irrigation and drainage
Author(s) from ARC
External authors (outside ARC)
    مجمد عبدالوهاب قاسم مدرس بقسم الهندسة الزراعية كلية الزراعة جامعة القاهرة
Agris Categories Agricultural engineering
AGROVOC
TERMS		 Irrigation.
Proposed Agrovoc OFF-TIME PERIOD;WATER DISTRIBUTION UNIFORMITY;
Publication Type Journal
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