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Combined Effects of Legumes with Rock Phosphorus on Rice in West Africa

^a Univ. of Göttingen, Inst. of Agron. in the Tropics, Grisebachstrasse 6, D-37077 Göttingen, Germany
^b Univ. of Bonn, Inst. of Agric. Chem., Karlrobert Kreiten Strasse 13, D-53115 Bonn, Germany
^c West Africa Rice Dev. Assoc. (WARDA), 01 BP 2551 Bouaké 01, Côte d'Ivoire, West Africa
^d Cent. for Dev. Res. (ZEF), Walter-Flex-Str. 3, D-53113, Bonn, Germany
^e Bp 12 595 Lomé, Togo, West Africa

View larger version (21K): [in a new window]   Fig. 1. Legume N yield and amounts of N fixed (15N isotope dilution method) as affected by P sources under flooded conditions in the pot and field experiments. Bars with the same letters are not significantly different (LSD, P < 0.05). PR, phosphate rock; TSP, triple superphosphate.

View larger version (17K): [in a new window]   Fig. 2. Effects of P sources on percentage of N derived from the atmosphere (%Ndfa) by A. afraspera as measured by the 15N isotope dilution method under flooded conditions in the pot and field experiments. Bars with the same letters are not significantly different (LSD, P < 0.05). PR, phosphate rock; TSP, triple superphosphate.