Soil Properties, Crop Yield, and Economic Return in Response to Lime Application on Acidic Nitisols of Southern Highlands of Ethiopia

IF 1.5 Q2 AGRONOMY International Journal of Agronomy Pub Date : 2023-12-29 DOI:10.1155/2023/6105725
Getahun Haile, Habtamu Berihun, Helina Abera, G. Agegnehu, M. Lemenih
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Abstract

Soil acidity is one of the major crop production constraints in the highlands of Ethiopia. Liming is becoming a common practice to amend soil acidity, but its effects on soil properties, crop yield, and farm income are not well studied. In this study, an on-farm liming experiment was conducted for two consecutive years (2020-2021) on acidic Nitisols (pH < 5.5) in Southern Ethiopia. The experiment consisted of six liming rates (control, 2.74, 4.11, 5.48, 6.85, and 8.22 t·ha−1) laid out in a randomized complete block design with three replications. Soil, agronomic, and economic data were collected in 2020 and 2021 cropping seasons and analyzed. The application of lime in the ranges of 2.74–8.22 t·ha−1 increased soil pH by 0.46–1.25 units and reduced exchangeable acidity by 2.02–3.17 units. Higher lime rates of 6.85–8.22 t·ha−1 increased soil pH sharply from 5.22 to 5.99 and 6.46, respectively, but such a rise in soil pH was not proportionally reflected in the yield increment. Higher available phosphorus contents of 7.16 and 6.01 mg·kg−1 were measured at the liming rates of 4.11 and 5.48 t·ha−1, respectively. Combined over the two years, 5.45 t·ha−1 lime application yielded the highest barley total biomass of 19,199 kg·ha−1 and a grain yield of 4,328 kg·ha−1, which are 46% and 30% higher than those of the control, respectively. It also yielded the highest marginal rate of return of 477% and a gross margin of 192,857.3 ETB1·ha−1, which is 53% higher than the control. Based on our results, 5.45 t·ha−1 of lime appears to have the optimal rate for economically viable barley production in the study area or similar environments.
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埃塞俄比亚南部高地酸性硝溶土壤施用石灰对土壤特性、作物产量和经济回报的影响
土壤酸性是埃塞俄比亚高原地区作物生产的主要制约因素之一。施用石灰正在成为一种常见的土壤酸化改良方法,但其对土壤特性、作物产量和农业收入的影响还没有得到很好的研究。本研究连续两年(2020-2021 年)在埃塞俄比亚南部的酸性 Nitisols(pH 值小于 5.5)上进行了农场施肥试验。试验包括六种施肥量(对照、2.74、4.11、5.48、6.85 和 8.22 吨/公顷-1),采用随机完全区组设计,三次重复。在 2020 年和 2021 年两季收集土壤、农艺和经济数据并进行分析。施用 2.74-8.22 吨/公顷的石灰,土壤 pH 值提高了 0.46-1.25 个单位,可交换酸度降低了 2.02-3.17 个单位。6.85-8.22 吨-公顷-1 的较高石灰用量使土壤 pH 值分别从 5.22 升至 5.99 和 6.46,但土壤 pH 值的升高并没有成比例地反映在增产上。在 4.11 吨/公顷和 5.48 吨/公顷的施肥量下,测得的可用磷含量分别为 7.16 毫克/千克和 6.01 毫克/千克。两年合计,施用 5.45 吨/公顷石灰的大麦总生物量最高,达到 19,199 公斤/公顷,谷物产量最高,达到 4,328 公斤/公顷,分别比对照高出 46% 和 30%。它的边际收益率也最高,达到 477%,毛利率为 192 857.3 ETB1-公顷-1,比对照高出 53%。根据我们的研究结果,5.45 吨/公顷的石灰用量似乎是在研究区或类似环境中生产经济可行的大麦的最佳用量。
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来源期刊
CiteScore
3.60
自引率
5.30%
发文量
66
审稿时长
16 weeks
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