Sahrawat, K.L. and Jones, M.P. and Diatta, S. and Sika, M. (2003) Long-term phosphorus fertilizer effects on phosphorus uptake, efficiency, and recovery by upland rice on an Ultisol. Communications in Soil Science and Plant Analysis, 34 (7-8). pp. 999-1011.
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Abstract
Phosphorus (P) deficiency is a major constraint to upland rice production on highly weathered, low activity clay soils in the humid zone of West Africa. There is a paucity of information on the long-term fertilizer P effects on rice on these soils. A field experiment was conducted for six years (1993-98) to determine the response of four upland rice cultivars to fertilizer P applied at 0, 45, 90, 135, and 180 kg P ha-1 only once in 1993, and to residual P in 1994, 1995, 1996, and 1998. The experimental site was located on an Ultisol, low in available P, in the humid forest zone of Côte d'Ivoire, West Africa. This paper discusses long-term P effects on P uptake and efficiency of upland rice cultivars. The cultivars evaluated differed in cumulative agronomic and physiological P efficiencies, and the efficiencies were higher at lower P rates for the P-efficient cultivars. The P uptake response and P harvest index were affected by P rate and its residual effect, which decreased with time after P was applied. The mean cumulative recovery of applied P in five crops of four rice cultivars varied from 5.5 to 9.4%. The results suggest that the variation in P efficiency of the cultivars is due to differences in the efficiency of utilization of P for grain production
| Item Type: | Article |
|---|---|
| Author Affiliation: | West Africa Rice Development Association (WARDA), Bouaké, Côte d'Ivoire |
| Subjects: | Plant Protection > Pesticides Soil Science and Microbiology > Soil Sciences |
| Divisions: | Other Crops |
| Depositing User: | Mr B Krishnamurthy |
| Date Deposited: | 20 Jul 2011 05:59 |
| Last Modified: | 20 Jul 2011 05:59 |
| Official URL: | http://dx.doi.org/10.1081/CSS-120019105 |
| URI: | http://eprints.icrisat.ac.in/id/eprint/2418 |
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