Study of phosphorus sorption isotherms of vertisol (Hanchinal), alfisol (Gubbi), oxisol (Ankola) and inceptisol (Kudalasangum) to predict the P needs of Deccan 101 maize (Zea mays L.) revealed that an equilibrium P solution concentration of 0.2 ppm would be optimum to get maximum dry matter yield. Per cent phosphorus content of maize was also maximum in all the soil types at an equilibrium P concentration of 0.2 ppm. Near maximum uptake of P by maize in all soil types except oxisol was observed at an equilibrium concentration of 0.2 ppm.
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