2. Institutional Publications

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Subject: search.filters.subject.Acid sulphate soils

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    Influence of liming on the exchangeable potassium of two acid sulphate soils of Kerala
    (Kerala Agricultural University, 1975) Kabeerathumma, S; Biddappa, C C
    Two typical acid sulphate soils of Kerala were employed in this study to investigate the influence of liming at different levels (which was used as an amendment to correct the soil acidity) on the exchangeable potassium with progress of time. It was noticed that the exchangeable potassium was continuously decreased upto 75th days in both the soils and in all the treatments. However when lime was applied at the rate of full lime requirement dose the decrease of the exchange. able potassium was very marked. This probably may be due to conversion of the exchangeable potassium initially to nonexchangeable forms. Thus liming enhanced the fixation of potassium in these soils.
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    Effect of submergence on the availability of toxic and deficient nutrients in acid sulphate soils of Kerala
    (Kerala Agricultural University, 1978) Kabeerathumma, S; Patnaik, S
    Laboratory incubation experiments were conducted with acid sulphate soils of Kerala to investigate the changes in pH exchangeable iron, manganese, aluminium, calcium and potassium. It was noted that flooding resulted in an increase in the soil pH and the extent of increase was determined by certain inherent characters of the soil. The exchangeable Fe content increased and reached a peak value in 30 days and then decreased. The amount of Fe released was dependent on the active iron content of the soils, of submergence. As for Mn Ac/;' and Kayal soils showed a higher release of Mn on flooding. But all the other soils showed only very little change. The course of change of exchangeable Mn was similar to that of Fe. The overall effect of submergence was towards an increased availability of Ca and K.
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    Studies on the change of lime potential of acid sulphate soils of Kerala on submergence
    (Kerala Agricultural University, 1980) Kabeerathumma, S; Patnaik, S
    Laboratory incubation experiments conducted using acid sulphate soils collected from different parts of Kerala revealed that simple lime potential of soil is markedly influenced by moisture and days of submergence. The corrected lime potential of strongly acid soils whose pH remained below five even after submmergence, remained unaffected by submergence.