2. Institutional Publications

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Subject: search.filters.subject.kole soils

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    Efficiency of primed rock phosphate for grain production in rice
    (Kerala Agricultural University, 1982) Madhusoodhanan Nair, K; Padmaja, P
    Potted plant studies were conducted in five major rice soils of Kerala namely karappadom, laterite, kayal, coastal sandy and kole soils to evaluate the efficiency of primed rock phosphate in moist aerobic soil with superphospate applied at flooding. Fractionation studies on the fate of applied phosphate revealed that priming of rock phosphate in moist aerobic soil resulted insubstantial conversion of phosphate to iron phosphate and aluminium phosphate and these products increased availability of phosphorus to rice on submergence. Primed rock phosphate was found to be as efficient as superphosphate in karappadom, kayal and coastal sandy soil in yield and uptake of phosphorus. But in laterite soil it was found to be significantly superior to superphosphate.
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    Distribution and forms of phosphorus in the kole soils
    (Kerala Agricultural University, 1991) Sheela, S; Koshy, M M; Korah, P A
    The different forms of phosphorus, such as saloid-P, Al-P, Fe-P, reductant soluble-P, occluded-P, Ca-P and organic-P, as well as total-P were determined in the surface and subsur face soils collected from 15 locations in the kole land area of Kerala State. The mean values of the different fractions showed that organic-P was the largest fraction, followed in order by Fe-P, reductant soluble-P, Al-P, Ca-P, occluded-P and saloid P. The most abundant inorganic fraction was Fe-P which constituted 29.75% of the total P in the surface layers and 37.46% in the subsurface layers. Reductant soluble-P constituted 23.91% and 22.16% respectively of the total P in the surface and subsurface horizons. Occluded-P formed 1.81% of the total P in the surface soils and 1.50% of the total P in the subsurface soils. Of the total P, 4.15 and 7.09% respectively were found in the Ca-P form in the surface and subsruface layers. The Fe-P was significantly and positively correlated to the total sesquioxides and the Ca-P was significantly and positively correlated with total CaO.
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    Standardization of bioassay technique for determining butachlor residues in kole soils of Kerala
    (Kerala Agricultural University, 1999) Durga Devi, K M; Abraham, C T; Prabhakaran, P V
    Different plant species were grown in pots containing soil fortified with known quantities of butachlor and based on the response to the herbicide amaranth was selected as the indicator plant for the herbicide. Among the several growth parameters tested for assessing the plant response to soil residues of butachlor, CSGR (compound shoot growth rate) proved to be the best for quantitative determination of butachlor residues in kole soils of Kerala.