Determination of Optimal Irrigation Scheduling for Durum Wheat in the Central Highland Vertosol of Ethiopia

Science Development Pub Date : 2024-07-23 DOI:10.11648/j.scidev.20240502.12

Solomon Kebede, Ashebir Tefera, Gebeyehu Molla

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Abstract

The field trial was conducted for three years from 2014/15 to 2016/17 to determine optimal irrigation scheduling. There were five levels of irrigation water application; 60%, 80%, 100%, 120%, and 140% of the allowable soil moisture depletion levels (ASMDL) for each of the treatments laid out in a randomized complete block design with three replications. In the study, the combined year analysis result showed that there is a significant yield difference among the irrigation water applications at a P < 0.05 level of significance. The highest yield (5.269 tone ha^-1) was obtained by applying irrigation water of 80% ASMDL followed by 120% ASMDL (4.734 tone ha^-1) however the least yield (4.165 tone ha^-1) was observed at irrigation water application of 60% ASMDL of the recommended level which means the application of 40% less water than the FAO recommended level. There is no significant difference in water use efficiency between the treatments, but the highest water use efficiency has been observed at 80% ASMDL. The overall result of this experiment suggests that the application of irrigation water using 20% less than the FAO recommendation (100% ASMDL) can sufficiently be used for irrigation scheduling of irrigated durum wheat under central highland vertosol conditions. Therefore, to have a higher yield of irrigated durum wheat it was recommended to flush frequently before critical depletion occurred.

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确定埃塞俄比亚中部高原沃土硬粒小麦的最佳灌溉时间安排

田间试验从 2014/15 年至 2016/17 年进行了三年，以确定最佳灌溉安排。每个处理的灌溉用水量为允许土壤水分耗竭水平（ASMDL）的60%、80%、100%、120%和140%，采用随机完全区组设计，三次重复。研究结果表明，在 P < 0.05 的显著水平下，不同灌溉水量的产量差异显著。灌溉水量为 80% ASMDL 时产量最高（5.269 吨/公顷-1），其次是 120% ASMDL 时（4.734 吨/公顷-1），而灌溉水量为建议水平的 60% ASMDL 时产量最低（4.165 吨/公顷-1），这意味着灌溉水量比粮农组织建议水平少 40%。各处理间的用水效率无明显差异，但 80% ASMDL 的用水效率最高。本试验的总体结果表明，在中部高原蛭石条件下，灌溉用水量比联合国粮农组织建议水平（100% ASMDL）少 20%即可满足硬质小麦灌溉调度的需要。因此，为了提高灌溉硬质小麦的产量，建议在出现临界耗竭之前频繁冲水。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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Science Development

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