Madras Agricultural Journal
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Influence of Continuous Cropping on the Availability of Phosphorus and Potassium Status in a Black Soil

Abstract

Available P and K status in a soll after six crops was assessed in the Long Term Fertilizer Experiments conducted at Coimbatore. The availability of P was changed by various fertilizer doses. There was depletion of available P from the control plats. As the the rate of P application increased. the availability also Increased giving rise to a quadratic equation of Y= 2.632 + 0.17824X0.0006 X. The available K was depleted over years except in 150% NPK dose (based on soil test) treatments, and FYM applied plots. A positive and significant correlation (R2 = 0.997) was obtained which gave a quadratic equation in the form of V-450.75 +1.365X0.0041 X*.

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Madras Agricultural Students Union
Tamil Nadu Agricultural University
Coimbatore - 641 003
Tamil Nadu, India.

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Madras Agricultural Students Union
Tamil Nadu Agricultural University
Coimbatore - 641 003
Tamil Nadu, India.

ISSN : 0024-9602
eISSN : 2582-5321

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