Supernatant solution phosphorus concentrations required by some tropical pasture species

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Abstract
Using phosphorus sorption curves, the supernatant solution P concentrations corresponding to 90% maximum yield of Stylosanthes guianensis, Centrosema pubesoens, Panicum maximum (N fertilized) and Melinis minutiflora (in association with S. guianensis) were 0.037 μg ml−1, 0.048 μg ml−1, 0.029 μg ml−1 and 0.034 μg ml−1 respectively. These non‐limiting concentrations were used to assess the suitability of the species for soils differing in phosphorus status. The use of non‐limiting concentrations for estimating phosphorus fertilizer requirements of the species is discussed.