Yield response of tef (Eragrostis tef) to nitrogen, phosphorus, potassium and sulphur under balanced fertilization on Vertisols in different agroecological zones of Ethiopia

IF 1.6 4区农林科学 Q1 Agricultural and Biological Sciences

Experimental Agriculture Pub Date : 2022-03-31 DOI:10.1017/S0014479722000114

G. Chala, S. Kassa, T. Tadele, K. Assefa, Hailemariam Teshome, G. Agegnehu, W. Abera, Degife Tibebe, G. Sileshi, T. Erkossa

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引用次数: 1

Abstract

Summary Nutrient deficiency is a major constraint in tef (Eragrostis tef (Zucc.) Trotter) production in Ethiopia. In the past, a blanket recommendation of nitrogen (N) and phosphorus (P) fertilizers has been applied regardless of the diversity of agroecological zones and soil types. As crop responses declined with widespread deficiencies of nutrients, farmers have lost interest in applying the recommended fertilizer rates. The present study was conducted with the objective of quantifying the response of tef to different rates of N, P, potassium (K) and sulphur (S) fertilizers under balanced application of the nutrients other than the one under investigation. In each region, the same set of trials was implemented on farmers’ fields for three years. All trials were implemented on Vertisols across four agroecological zones (AEZs). The treatments were seven rates of N, six rates each of P and S and eight rates of K with a basal application of zinc (Zn) and boron (B). The results showed that the most limiting nutrient is N followed by P in each agroecological zone on the Vertisols. There was clear evidence of increases in grain yield with increasing rates of N and P, but the responses to K and S rates did not follow clear trends across AEZs. With balanced application of the other nutrients, 23–92 kg N ha−1 increased grain yield by 11–92%, while 10–40 kg P ha−1 increased yields by 12–33% over the control in the different AEZs. Based on results from dose–response models, it is concluded that the agronomic optimum rates for tef production are 69 kg N, 20 kg P, 30 kg K and 10 kg S ha−1 in the cool sub-moist mid-highlands and the tepid sub-humid mid highlands; 92 kg N, 30 kg P, 15 kg K and 10 kg S ha−1 in tepid moist mid highlands but 69 kg N, 10 kg P, 15 kg K and 10 kg S ha−1 in the tepid sub-moist mid highlands. On Vertisols not covered by this study, these recommendations should be subject to appropriate soil and plant analysis. We also recommend further studies on the nutrient requirement of tef on other soil types and AEZs.

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埃塞俄比亚不同农业生态区氮磷钾硫平衡施肥条件下油菜产量的响应

营养缺乏是制约tef (Eragrostis tef (Zucc.))生长的主要因素。埃塞俄比亚的猪蹄生产。过去，不考虑农业生态区和土壤类型的多样性，只推荐使用氮肥和磷肥。由于普遍缺乏营养，作物反应下降，农民对施用推荐的肥料量失去了兴趣。本研究的目的是定量研究在平衡施用除所研究的营养物以外的其他营养物的情况下，tef对不同氮、磷、钾和硫的响应。在每个地区，同样的一套试验在农民的田地里实施了三年。所有试验均在四个农业生态区(aez)实施。施氮量为7份，磷、硫各6份，钾8份，以锌、硼为基肥。结果表明，在垂直土壤上，各农业生态区氮素限制最大，磷次之。有明显的证据表明，粮食产量随氮、磷施用量的增加而增加，但对钾、硫施用量的响应在经济专用区之间没有明显的趋势。在均衡施用其他养分的情况下，在不同经济区域，施用23 ~ 92 kg N hm−1比对照增产11 ~ 92%，施用10 ~ 40 kg P hm−1比对照增产12 ~ 33%。结果表明，低温亚湿润型中高原和温和亚湿润型中高原的最佳农艺产量为69 kg N、20 kg P、30 kg K和10 kg S ha−1;中度湿润的中部高原为92 kg N、30 kg P、15 kg K和10 kg S ha−1，而中度湿润的中部高原为69 kg N、10 kg P、15 kg K和10 kg S ha−1。对于本研究未涉及的农药，这些建议应以适当的土壤和植物分析为基础。建议进一步研究tef在其他土壤类型和经济隔离区的养分需求。

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来源期刊

Experimental Agriculture 农林科学-农艺学

CiteScore

2.50

自引率

6.20%

发文量

审稿时长

24 months

期刊介绍： With a focus on the tropical and sub-tropical regions of the world, Experimental Agriculture publishes the results of original research on field, plantation and herbage crops grown for food or feed, or for industrial purposes, and on farming systems, including livestock and people. It reports experimental work designed to explain how crops respond to the environment in biological and physical terms, and on the social and economic issues that may influence the uptake of the results of research by policy makers and farmers, including the role of institutions and partnerships in delivering impact. The journal also publishes accounts and critical discussions of new quantitative and qualitative methods in agricultural and ecosystems research, and of contemporary issues arising in countries where agricultural production needs to develop rapidly. There is a regular book review section and occasional, often invited, reviews of research.