Uzoh, I.M. and Obalum, S.E. and Igwe, C.A. and Abaidoo, R.C. (2017) Quantitative Separation of Nitrogen and Non-Nitrogen Rotation Benefits for Maize Following Velvet Bean Under Selected Soil Management Practices. Agricultural Research, 6 (4). pp. 378-388.
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Abstract
It is increasingly known that factors other than legume-fixed nitrogen contribute to rotation benefit (yield advantage of legume/cereal over cereal/cereal). The contributions of nitrogen and such other factors were quantified to guide soil fertility management in legume/cereal systems. Under greenhouse conditions, the effects of returning first crop’s residue to the soil, crop sequence (velvet/maize, maize/maize) and nitrogen-fertilizer level on yield of second maize were used to separate rotation benefits into nitrogen and non-nitrogen factors, while the corresponding effects of crop sequence, mycorrhizal inoculation and phosphorus-targeted fertilization in a parallel experiment were used to disaggregate the non-nitrogen effects. Crop residue and velvet/maize had positive effects on soil nitrogen and maize yield. Nitrogen fertilizer had optimal effects at 60 kg ha-1, while phosphorus enhanced maize yields the most when no essential nutrient was limiting. Rotation benefit was lower without (13.59%) than with (33.27%) residue. Non-nitrogen rotation benefit was 37.5%. Relative contributions of nitrogen, phosphorus, other nutrients, mycorrhiza and not-considered factors were, respectively, 34, 9, 6, 21 and 30% without residue and 68, 4, 3, 10 and 15% with residue. Crop residue management has, therefore, a strong underlying influence on legume-to-cereal rotation benefit and the relative contribution of its components.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | Legume/cereal crop rotation, Legume-fixed soil nitrogen, Monocropping system, Non-nitrogen rotation benefits, Soil available phosphorus |
| Author Affiliation: | Department of Soil Science, Faculty of Agriculture, University of Nigeria, Nsukka 410001, Nigeria |
| Subjects: | Plant Protection |
| Divisions: | Maize |
| Depositing User: | Mr B Krishnamurthy |
| Date Deposited: | 01 Dec 2017 08:42 |
| Last Modified: | 01 Dec 2017 08:42 |
| Official URL: | http://dx.doi.org/10.1007/s40003-017-0272-8 |
| URI: | http://eprints.icrisat.ac.in/id/eprint/15194 |
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