KINETICS OF POTASSIUM DESORPTION IN SUGARCANE GROWING VERTISOL SOILS OF KOLHAPUR DISTRICT (MAHARASHTRA), INDIAG.D. Patil, B.H. Yadawad, D.D. Sawale and N.B. More
The highest constant potassium release was noticed in the soils of Marali (20 mg kg-1) and attained the constant rate of release upto 9th extraction. The lowest content of potassium reserve was observed in sugarcane growing soils of Vertisol of Pushire Borgaon and Pimple Satave (4 mg kg-1) village from Panhala tahasil of Kolhapur district. The second-order is the best fit for potassium desorption for predicting the amount of potassium release because it has recorded the highest mean value of coefficient of determination, r2 = (0.87) and the lowest value of standard error of estimate (SE = 3.75E-05). The highest cumulative potassium release rate was noticed in soils of Marali (521 mg kg-1) and the lowest cumulative potassium release (131 mg kg-1) was noticed in Pimple Satave village. The Reciprocal Straight Line, Horel, Linear Reciprocal, Cauchy, Logarithmic, Log. Normal, Normal, Modified Horel, Exponential and Modified Power equations observed the higher coefficient of determination (r2 = >0.90). Hence these mathematical models could be used to predict the amount of potassium desorbed in sugarcane growing soils of Vertisols of Kolhapur district. The zero-order mathematical model recorded the lowest mean values of coefficient of determination (r2=0.34) and it could not be used for desorption studies for predicting the best fit for the release of potassium desorption in sugarcane growing soils of Vertisol.
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