Response of interspecific and sativa upland rices to Mali phosphate rock and soluble phosphate fertilizer |
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| Authors: | Brahima Kone Oikeh Sylvester Sitapha Diatta Eklou Somado Kotchi Valere Kanwar Lal Sahrawat |
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| Institution: | 1. Africa Rice Center (WARDA) , Cotonou , Calavi , Benin;2. Cocody University , Abidjan , C?te d'Ivoire , Africa b.kone@cgiar.org;4. Water Efficient Maize for Africa (WEMA), African Agricultural Technology Foundation (AATF) , Nairobi , Kenya;5. Africa Rice Center (WARDA) , Cotonou , Calavi , Benin;6. Cocody University , Abidjan , C?te d'Ivoire , Africa;7. International Crops Research Institute for the Semi-Arid Tropics (ICRISAT), Global Theme Agroecosystems , Patancheru , India |
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| Abstract: | In West Africa, two-thirds of upland rice is grown on acidic phosphorus (P)-deficient soils. Phosphorus is one of the most limiting-nutrients affecting crop productivity. A three-year field experiment was conducted on a Ferralsol in Côte d'Ivoire to study the response of four interspecific rice cultivars and a sativa (control cultivar) to Tilemsi phosphate rock (PR) and soluble triple superphosphate (TSP) fertilizer. PR was applied at 0, 150, 300, and 450 kg ha?1 P once in the first year and residual effects were measured in the following years. TSP (0, 50, 100 and 150 kg ha?1 P) was applied yearly. More significant yield increasing (38%) was observed in the second year. Annual application of 50 kg P ha?1 as TSP or a one-time application of 150 kg P ha?1 as PR was the optimum rate for the production of all cultivars. Higher rates of P from TSP (100 and 150 kg P ha?1) gave 2–3 times greater residual P in soil than the optimum rate, inducing no further response of rice. Two interspecific cultivars were identified as the most acid- and low P-tolerant cultivars for improving rice production in West Africa humid forest zone. |
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| Keywords: | acid soil interspecific rice Oryza sativa phosphorus humid forest |
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