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Type: Journal article
Title: The potential for rhizobial inoculation to increase soybean grain yields on acid soils in Ethiopia
Author: Fana, D.
Ryder, M.
Denton, M.
Citation: Soil Science and Plant Nutrition, 2017; 63(5):441-451
Publisher: Society of the Science of Soil and Manure
Issue Date: 2017
ISSN: 0038-0768
Statement of
Daniel Muleta, Maarten H. Ryder and Matthew D. Denton
Abstract: In Ethiopia, inoculation of soybean with rhizobial inoculants is not common practice, but could provide an option to increase grain yields in the low nitrogen (N) acidic soils. In these acid soils, the selection of acid tolerant rhizobia is one strategy that may increase the performance of soybean. In this study, rhizobial strains isolated from Ethiopian soils were evaluated for their acid tolerance and symbiotic N fixation efficiency with soybean, in controlled environments. Following this, four isolated rhizobial strains were evaluated in six field experiments in major soybean growing areas of Ethiopia. Inoculation with the commercial strain or with one of two locally-sourced isolates, that were developed as inoculants, improved soybean yield. The yield increase due to inoculation with the commercial strain was consistent and greater than other treatments, while the increase due to the two locally-sourced strains was comparable to, or greater than, application of 46 kg N/ha in soils, where the resident rhizobial population was ≤ 1.4 × 103 cfu/g soil. For soils with high background rhizobial populations, there was no response to inoculation. In one of the experimental sites (Bako), the percentage of N fixed (%Ndfa) was 55 for the commercial strain and 35 for a local strain, ES3. This study demonstrated that field validation is a necessary step in the selection of acid tolerant strains of rhizobia to increase soybean production for Ethiopia.
Keywords: Soybean; rhizobia; acid tolerance; nodulation; symbiotic effectiveness
Rights: © 2017 Japanese Society of Soil Science and Plant Nutrition
RMID: 0030075481
DOI: 10.1080/00380768.2017.1370961
Appears in Collections:Agriculture, Food and Wine publications

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