Upadhyay, A.K.Palaniswami, C.Hameed Khan, H.Balamurugan, J.2014-06-262014-06-262005Journal of Plantation Crops, 2005,33 (2) : 95-98http://hdl.handle.net/123456789/3366Potassium adsorption studies were carried out in a red sandy loam soil (Arenic Paleushclt) under various fertilizer regimes in coconut under coconut based cropping system at Kasaragod. The soil samples were collected fmm the basin of the coconut palms. Adsorption studies are carriedout using batch technique with five K levels viz. 0,259,500,750 and 1000 ppm K. In the treatments, no fertilizer, one-fifth and one-fourth of the recommended dose, the adsorbed K increased up to 750 ppm K level. and there upon it showed a decline at 1000 ppm K level. However, in case of other three fertilizer regimes, the adsorption of K incwed to 500 pprn K level, beyond which there was decline in K adsorption. Within the K levels. K adsorption dedined from no fertilizer upto one-fourth of the recommended dose and after which the K adsot iainnm ased with increasing fertilizer levels. The optimum K application to maximize the soil solution K for optimum plant nutrition at each treatment level ranged from 662 ppm (full dose) to 692 ppm (No fertilizer). The quantity of K fertilizer required to optimize the soil solution K concentratibn in red s d y lo& soil is 119g YO palm-year, which very well matches with the general K recommendation (1200g YO palm-year) for the crop in India.enPotassium adsorptionred sandy loamsoil solution K levelcoconutpotassium requirementArticle