National Academy of Agricultural Sciences (NAAS)
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PRINT ISSN : 2319-7692 Online ISSN : 2319-7706 Issues : 12 per year Publisher : Excellent Publishers Email : editorijcmas@gmail.com / submit@ijcmas.com Editor-in-chief: Dr.M.Prakash Index Copernicus ICV 2018: 95.39 NAAS RATING 2020: 5.38 |
The investigation entitled Studies on the effect of different sources of potassium on forms and distribution, release kinetics and fixation characteristics in Alfisols was conducted during 2019-20 at UHS campus, College of horticulture, GKVK, Bengaluru. The experiment was laid out in RCBD with 8 treatments replicated thrice. Different sources of potassium (sulphate of potash, muriate of potash, potassium nitrate, Sulphate of Potash magnesia, Opifol maturation, Plantafol, Potassium schoenite and sulphate of potash magnesia) were applied at the rate of 63 kg ha-1. The results revealed that treatment T2 contains high amount of WS-K and Exch-K in surface (14.84 and 91.87 mgkg-1). In sub surface high amount NE-K and lattice-K (169.91 and 3570.75 mgkg-1) and total-K in both surface (3573.71 mgkg-1) and sub-surface (4039.31 mgkg-1). The results showed that T2:K Supplied through sulphate of potash had recorded significantly high potassium fixation capacity in both surface (0.53 meq 100 gm-1 soil) and sub-surface (0.70 meq 100 gm-1 soil). The potassium release was faster in the initial stage up to 5th extraction and later it released less amount of K and finally reached constant by 10th or 11th extraction. The highest amount of total step K was recorded in the treatment which received sulphate of potash (755 mgkg-1). The per cent contribution of different fractions of K to total-K were followed in the order of lattice-K ((92.18 %), NE-K (4.8%), Exch-K (2.6%) and WS-K (0.42%) in surface.
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