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International Journal of Soil Science

Year: 2006  |  Volume: 1  |  Issue: 3  |  Page No.: 227 - 234

Potassium and Phosphorus Releasing Capacity of Latosols under Tea Cultivation in South India

S. Venkatesan and V.K. Senthurpandian

Abstract

Potassium and phosphorus releasing capacity of tea soils were studied by collecting soil samples from sixteen agro climatic zones of south Indian tea growing areas. A drastic reduction in potassium release was noted even at the second extraction uniformly in all zones which confirms the fact that there is no binding site for potassium in tea soils of south India. The total releasable potassium was generally found higher in various zones of Munnar and Nilgiris region. The phosphorus release decreased gradually with successive extractions and attained a constant value during eighth or ninth extractions. The Cobb-Douglas equation worked out for potassium release indicated that the Latosols of south India could be grouped under highly responsive to medium responsive category towards externally applied potassium. The values of `a` is the measure of degree of steepness of nutrient release from soil, which was lower for phosphorus release when compared to that of potassium. Unlike in the case of potassium no drastic reduction in phosphorus release was noted due to successive extraction.

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