Journal Of Applied Horticulture ISSN: 0972-1045


Samson Bekele Diro and Ketema Tilahun

Amhara Regional Agricultural Research Institute, Sekota, Ethiopia. Amhara Regional Agricultural Research Institute, Sekota, Ethiopia. Presemt address: School of Agricultural and Wine Sciences, Charles Sturt University, Locked Bag 588, Wagga Wagga NSW2678,

Key words: Growth stages, deficit irrigation, Ethiopia, CROPWAT model, onion

Journal of Applied Horticulture, 2009, volume 11, issue 2, pages 103-106.

Abstract: Deficit irrigation conserves water and minimizes adverse effects of excess irrigation. In this study, the applicability of the CROPWAT model in management of deficit irrigation was evaluated at Sekota Agricultural Research Center, Ethiopia. Water was applied using low head drippers. There were eight treatments with three replications: stress at 1st, 2nd, 3rd, and 4th growth stages and partial stresses of 50% ETc, 75% ETc with two controls of 25% ETc and 100% ETc of the water requirement throughout the growing season. The input data for CROPWAT program were climatic, rainfall, crop and soil data. Yield reductions simulated by CROPWAT program were comparable with yield reduction measured under field condition. Model efficiency and correlation coefficients of 98% were obtained. Based on the above comparative analysis, CROPWAT program could adequately simulate yield reduction resulting from water stress.

Journal of Applied Horticulture