Variation in growth and N2 [nitrogen] fixation within and among Centrosema spp. in response to phosphorus supply
1992
Cadisch, G. | Sylvester-Bradley, R. (Centro Internacional de Agricultural Tropical, Cali (Colombia)) | Nosberger, J. (Swiss Federal Inst. of Technology, Zurich (Switzerland))
Four inoculated ecotypes of each of Centrosema acutifolium, C. brasilianum, and C. macrocarpum were grown in undisturbed soil cores in the glasshouse at 7 levels of P application. At 7 weeks after planting, dry matter production, leaf area, N yield, nodulation, nodule P, acetylene reduction activity, and shoot N all increased strongly with P supply. Response to P in leaf number, leaf size and leaf-stem ratio, nodule number and nodule weight differed among species. Intra-specific variation was strong in dry matter and N yields, shoot N, and nodule P.
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