Due to the scarcity and/or unreliability of canal water supply, seepage water is haphazardly used for sole irrigation or in conjunction with canal water in most small-scale irrigation schemes in northern Ethiopia. This has been a major cause of low crop yield and has aggravated soil salinization. The problem is more exacerbated for onion, which is the major irrigated vegetable crop and is sensitive to salinity. Thus, it is essential to assess a sustainable way to use both water resources conjunctively for the production of onion. A new study in the Ethiopian context was conducted to evaluate the effect of cyclic irrigation using non-saline canal water (EC, 0.41–0.78 dS m−1) and moderately saline seepage water (EC, 0.82–2.19 dS m−1) on onion yield and soil salinization for two seasons (2014/2015 and 2015/2016) in the Gumselassa irrigation scheme, Ethiopia. Four irrigation water treatments were applied with three replications consisting of: C (canal), S (seepage), 2CS (two canal and seepage) and CS (canal and seepage). In both seasons, the onion bulb yield variations between the C, 2CS and CS treatments were not significant; however, the S treatment reduced the onion yield significantly compared to all but CS in 2015/2016. The S treatment resulted in significant salt accumulation in the upper soil profile (0–20 cm). The alternate (C : S) cyclic option is thus recommended for alleviation of the problem of freshwater scarcity, without undue onion yield reduction and soil salinization in Gumselassa and similar irrigation schemes.

中文翻译：

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中度咸水和非咸水循环灌溉对埃塞俄比亚北部半干旱地区洋葱（Allium cepa L.）产量和土壤盐渍化的影响

由于运河供水的稀缺和/或不可靠，在埃塞俄比亚北部的大多数小规模灌溉计划中，渗水被随意用于单独灌溉或与运河水结合使用。这是造成作物产量低的主要原因，并加剧了土壤盐渍化。洋葱的问题更加严重，洋葱是主要的灌溉蔬菜作物，对盐分敏感。因此，必须评估一种可持续的方式，以联合使用两种水资源来生产洋葱。在埃塞俄比亚进行了一项新研究，以评估使用非咸水运河水（EC，0.41–0.78 dS m-1）和中度咸水渗流水（EC，0.82–2.19 dS m-1）进行循环灌溉的效果。 Gumselassa 灌溉计划中两个季节（2014/2015 和 2015/2016）的洋葱产量和土壤盐渍化，埃塞俄比亚。四个灌溉水处理应用三个重复，包括：C（渠道）、S（渗流）、2CS（两个渠道和渗流）和 CS（渠道和渗流）。在两个季节，C、2CS 和 CS 处理之间的洋葱鳞茎产量差异不显着；然而，与 2015/2016 年除 CS 以外的所有处理相比，S 处理显着降低了洋葱产量。S 处理导致上层土壤剖面（0-20 厘米）中显着的盐分积累。因此，建议使用替代 (C:S) 循环选项来缓解淡水短缺问题，而不会在 Gumselassa 和类似的灌溉计划中过度降低洋葱产量和土壤盐渍化。2CS（两管渗水）和CS（管渗水）。在两个季节，C、2CS 和 CS 处理之间的洋葱鳞茎产量差异不显着；然而，与 2015/2016 年除 CS 以外的所有处理相比，S 处理显着降低了洋葱产量。S 处理导致上层土壤剖面（0-20 厘米）中显着的盐分积累。因此，建议使用替代 (C:S) 循环选项来缓解淡水短缺问题，而不会在 Gumselassa 和类似的灌溉计划中过度降低洋葱产量和土壤盐渍化。2CS（两管渗水）和CS（管渗水）。在两个季节，C、2CS 和 CS 处理之间的洋葱鳞茎产量差异不显着；然而，与 2015/2016 年除 CS 以外的所有处理相比，S 处理显着降低了洋葱产量。S 处理导致上层土壤剖面（0-20 厘米）中显着的盐分积累。因此，建议使用替代 (C:S) 循环选项来缓解淡水短缺问题，而不会在 Gumselassa 和类似的灌溉计划中过度降低洋葱产量和土壤盐渍化。S 处理导致上层土壤剖面（0-20 厘米）中显着的盐分积累。因此，建议使用替代 (C:S) 循环选项来缓解淡水短缺问题，而不会在 Gumselassa 和类似的灌溉计划中过度降低洋葱产量和土壤盐渍化。S 处理导致上层土壤剖面（0-20 厘米）中显着的盐分积累。因此，建议使用替代 (C:S) 循环选项来缓解淡水短缺问题，而不会在 Gumselassa 和类似的灌溉计划中过度降低洋葱产量和土壤盐渍化。