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Cotton Root Growth and Uptake of Nutrients: Relation of Phosphorus Uptake to Quantity, Intensity, and Buffering Capacity¹

ABSTRACT

Cotton (Gossypium hirsutum var. ‘Stoneville 213’) was grown in greenhouse pots containing Hartsells fine sandy loam. Four rates of P were employed and the crop was harvested on three different dates. Dry matter yield of tops and uptake of P were measured. Roots were recovered and their length determined. These data were used to calculate a rate of P uptake per meter of roots which in turn was related to quantity and intensity of soil P. A parameter that combines the effects of quantity, intensity, and P buffering capacity was derived, and rate of P uptake was found to be related to this parameter. Rate of P uptake increased with rate of root growth.

¹ Contribution from Soils and Fertilizer Research Branch, Div. of Agr. Dev., National Fertilizer Dev. Cen., TVA, Muscle Shoals, Alabama 35660. Presented on November 2, 1972, at the annual ASA meetings in Miami Beach, Florida, in session 6 of division S-4.

² Research Chemist and Agricultural Aide, respectively.

Received for publication August 31, 1972. Accepted for publication December 22, 1972.