Vol. 7, Issue 2 (2019)
Dynamics of potassium fractions under submergence in characteristic sandy clay and loamy sand rice soils of Kerala
Author(s): Naveen Leno and Moossa PP
Abstract: A laboratory incubation study was carried out at the College of Agriculture, Vellayani to monitor the dynamics of native as well as applied K in the two representative soil types - lateritic alluvium of Pattambi (Kandiaqult) and Onattukara sandy soils (Quartzipsamment) as influenced by a flooded moisture regime. The experiment was carried out at two levels of K – 0 and 45 kg K2O ha-1. Wet soil samples were drawn at periodic intervals and analysed for water soluble, exchangeable, available, nitric acid soluble, fixed and lattice bound fractions of potassium. A gradual decrease in water soluble K fraction was observed after 15 days of submergence in Pattambi soils and after 20 days in Onattukara soils. Onattukara soils recorded higher values of water soluble K fraction as compared to Pattambi soils. But exchangeable and available K fractions were higher in Pattambi soils than in Onattukara soils. The decrease in available K with submergence observed in Pattambi soils is attributed to potassium fixation in the soil which is not noticed in Onattukara soils. At higher level of added K statistically significant increase in the HNO3 – K fraction was observed on the 50th day of submergence in Pattambi soils. Significant increase of fixed potassium was observed after 30 days of submergence (284.4 mgkg-1) and then again on 50 days of submergence (290.6 mgkg-1) in Pattambi soils. There was no significant change in the fixed potassium fraction in Onattukara soils. Neither the added K nor the period of submergence could bring about a change in the clay mineral lattice which accommodates the lattice K fraction.
Pages: 1492-1496 | 497 Views 99 Downloads
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How to cite this article:
Naveen Leno, Moossa PP. Dynamics of potassium fractions under submergence in characteristic sandy clay and loamy sand rice soils of Kerala. Int J Chem Stud 2019;7(2):1492-1496.
