Bado, B V and Sedogo, M and Lompo, F and Maman Laminou, S M (2018) Biological Nitrogen Fixation by Local and Improved Genotypes of Cowpea in Burkina Faso (West Africa): Total Nitrogen Accumulated can be used for Quick Estimation. Advances in Agriculture, 2018 (964192). pp. 1-8. ISSN 2356-654X
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Abstract
Biological nitrogen fixation (BNF) by legumes is an indicator of their potential contribution to recycling nitrogen in cropping systems. Many techniques exist for the quantitative measurement of legume BNF. The isotopic dilution (ID) methods are the most accurate but are too expensive, time-consuming and require technical expertise. There is a gap between the simple but less accurate Total Nitrogen Difference (TND) method and the Isotopic Dilution (ID) methods. By measuring the BNF of 11 cowpea (Vigna unguiculata) genotypes, this study aimed to develop a simple model as an improved tool for the quick estimation of BNF. Total N accumulated by traditional genotypes from Burkina Faso varied from 23 to 41 kg ha−1. Approximately 40 to 65% of this was nitrogen derived from the atmosphere (Ndfa) when the TND method was used (Ndfa-TND), while the ID method indicated that 29 to 37% of N accumulated was derived from the atmosphere (Ndfa-ID). The TND method overestimated the BNF of high N-yielding genotypes but underestimated the BNF of low N-yielding genotypes (N-accumulated below 31 kg N ha−1). The relationship between N-accumulated and Ndfa-ID was described by a polynomial regression: = 0.0127 - 0.5354 + 17.44, where and represent Ndfa-ID and N-accumulated, respectively (P<0.05, R2 =0.92). The model was validated and could be used for quick estimation of BNF directly from the N accumulated.
| Item Type: | Article |
|---|---|
| Divisions: | Research Program : West & Central Africa |
| CRP: | CGIAR Research Program on Grain Legumes and Dryland Cereals (GLDC) |
| Uncontrolled Keywords: | Biological nitrogen fixation, cropping systems, legumes, Isotopic Dilution, ID methods, Total Nitrogen Difference methods, TND, cowpea genotypes, Burkina Faso, Africa |
| Subjects: | Others > Burkina Faso Others > Cowpea Others > Cropping and Farming Systems Others > Genetics and Genomics Others > West Africa |
| Depositing User: | Mr Ramesh K |
| Date Deposited: | 30 Oct 2018 10:20 |
| Last Modified: | 17 Jan 2019 13:00 |
| URI: | http://oar.icrisat.org/id/eprint/10917 |
| Official URL: | http://dx.doi.org/10.1155/2018/9641923 |
| Projects: | UNSPECIFIED |
| Funders: | International Atomic Energy Agency (IAEA) and Food and Agriculture Organization (FAO) |
| Acknowledgement: | The authors are grateful to Dr. F. Zapata, Project Officer, for his assistance, the staff of the FAO/IAEA Agriculture and Biotechnology Laboratory at Seibersdorf for their support for the isotopic analyses, and Ti´ekoura Traore and Amoro Si´e Ouattara for their kind support in field works. This study was funded by the International Atomic Energy Agency (IAEA) and Food and Agriculture Organization (FAO) under FAO/IAEA Contract BKF-10952 and Institut de l’Environnent et de Recherche Agricole (INERA) of Burkina Faso |
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