Fig. 4. Orthophosphate concentration in the runoff water of the Stellar and Chilicotal soils in the plot treated 18, 12, 6, and 0.5 mo before the simulated rainfall initiation with 90 Mg ha^-1 of biosolids, Sierra Blanca, Texas. Pairs of columns with the same lowercase letters were not significantly (P 0.05) different

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