Department of Plant Sciences, Aksum University P.o. Box 314, Shire, Ethiopia.
Department of Plant Sciences, Haramaya University P.o. Box 138, Dire-Dawa, Ethiopia.
Sci Rep. 2018 Jun 22;8(1):9495. doi: 10.1038/s41598-018-27762-x.
Onion is important in the daily Ethiopian diet though the average yield obtained by farmers is very low. This is attributed to a number of constraints among which are poor agronomic practices. Therefore, field experiment was conducted at Tahtay Koraro district to study the effect of nitrogen fertilizer and intra-row spacing on growth and yield of onion. The treatments consisted of a factorial combination of four rates of nitrogen (0, 50, 100 and 150 kg N ha) and four intra- row spacings (4, 6, 8, and 10 cm). Bombay Red was the variety of onion used in the experiment. The experiment was laid out as RCBD with three replications. The analysis of variance revealed that N and intra-row spacing were significant. Both N and intra-row spacing significantly affected percentage of Bolting plants, leaf length, bulb diameter, and marketable yield. 100 kg N ha and a population of 833,300 plants ha was found to be the optimum rate to obtain higher marketable bulb yield of 26.72 t ha and economically attractive benefits. Therefore, Bombay red variety could be planted at an optimum spacing of 6 cm × 20 cm or 833,300 plant population density ha in Tahtay koraro district of northern Ethiopia.
洋葱在埃塞俄比亚的日常饮食中很重要，尽管农民的平均产量非常低。这归因于许多限制因素，其中包括不良的农业实践。因此，在塔塔科拉罗地区进行了田间试验，以研究氮肥和行间距对洋葱生长和产量的影响。处理由氮（0、50、100 和 150 kg/ha）和行间距（4、6、8 和 10 cm）四个水平的因子组合组成。实验中使用的洋葱品种是 Bombay Red。该实验采用完全随机区组设计，设三个重复。方差分析表明，氮和行间距均有显著影响。氮和行间距均显著影响抽薹率、叶片长度、鳞茎直径和商品产量。发现 100 kg/ha 的氮和 833,300 株/ha 的密度是获得更高的 26.72 t/ha 商品鳞茎产量和经济吸引力的最佳施氮量。因此，Bombay red 品种可以在埃塞俄比亚北部的塔塔科拉罗地区以最佳的 6 cm×20 cm 行间距或 833,300 株/ha 的密度进行种植。
