2. Institutional Publications

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Author: search.filters.author.Venugopal, V K

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    Profile characteristics and irrigability classification of kole lands of Trichur district
    (Kerala Agricultural University, 1979) Venugopal, V K; Bhaskaran Nair, V
    The detailed soil survey of Manalur Village representing the 'kole' area of Trichur district was carried out. Three soil series viz. Konchira, Perumpuzha and Anthikad were identified. The morphological features, chemioal and physical characteristics and irrigability classification are discussed. A soil and land irrigability map of the village indicating the distribution of soils end the irrigability classes has been prepared.
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    Cation exchange capacity in relation to the mechanical composition and organic matter status of some soil profiles of Kerala
    (Kerala Agricultural University, 1976) Venugopal, V K; Koshy, M M
    A study was made of the cation exchange capacity of forty soil samples representing fourteen soil profiles of Kerala in relation to the mechanical composition and organic matter status of the soil. The important findings are summarised below: (1) The cation exchange capacity of the different soil groups exhibited wide variations, the sandy soil recording the lowest and the black soil the highest value. With the exception of black, kari and some alluvial soils all other soil groups gave very low values for this property. (2) Correlation between cation exchange capacity and clay for all the samples taken together was positive and highly significant. The same positive relationship was observed when the individual soil groups were considered. (3) The relationship between organic matter and cation exchange capacity for all the samples together was positive but not significant.
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    Exchangeable cations of some important soil profiles of Kerala
    (Kerala Agricultural University, 1976) Venugopal, V K; Koshy, M M
    A study was made of the exchangeable cations of forty soil samples representing fourteen soil profiles of Kerala. The exchangeable base content of the different soils was generally in the order calcium > magnesium > potassium > sodium. In the case of kari and black soils the exchangeable sodium showed a higher content over potassium. The maximum amounts of exchangeable calcium, magnesium and potassium was observed in the black soil. The heighest value of exchangeable hydrogen was observed in the case of kari soil which also recorded very low values of pH.
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    Cation exchange capacity and chemical composition of clay fraction of some important soil groups of Kerala
    (Kerala Agricultural University, 1978) Venugopal, V K; Koshy, M M
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    Micronutrient status of soil and leaf of coconut palms growing on reclaimed marshy soil
    (Kerala Agricultural University, 1985) Jose, A I; Venugopal, V K; Sushama, P K; Gopi, C S; Saifudeen, N
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    Morphology and particle size distribution in the soil profiles from a catena in Kerala
    (Kerala Agricultural University, 1985) Venugopal, V K; Koshy, M M
    Investigations on the morphology and mechanical composition were carried out in a toposequence located in the mid-upland laterite region of Kerala. The sequential profiles in the toposequence showed a striking gradation in colour from reddish in the crest to different shades of grey in the valley. The structural development showed a decrease down slope. Another significant observation was the striking decrease in the content of coarse fragments down the slope. Among the size fractions, sand tended to accumulate in the nearly level lower slope position, while clay fraction decreased down slope. The formation of the diverse group of soils have been attributed to the variations in topography, causing erosion colluviation, sedimentation and other pedogenic processes modified by water table.
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    Available nutrient status of some red soils (Alfisols) from different regions in Kerala
    (Kerala Agricultural University, 1986) Betty Bastin; Venugopal, V K
    study was made on the available nutrient status of sixty surface samples collected from red soil (Alfisols) series identified in different regions in Kerala. Among the major nutrients, Bray 1 extractable phosphorus recorded high values for all the soil series. Nitrogen was low to medium in Vellayani, Cheriniyoor and Beypore, while it was medium in Chirakkal, Bharanikkavu and Kunhimangalam series. Low to medium levels of available potassium was observed in Chirakkal, Bharanikkavu, Beypore and Cheriniyoor series while Kunhimangalam and Vellayani series showed low levelsof available potassium. All the soils showed high phosphorus fixing capacity. DTPA extractable iron and manganese were more than adequate in the surface soils of all the soils investigated. Zinc was deficient to adequate in Vellayani, Bharanikkavu and Kunhimangalam series and marginal to adequate in Cheriniyoor, Beypore and Chirakkal series. Copper was deficient to adequate in Vellayani, Cheriniyoor and Kunhimangalam series while, adequate levels were observed in Bharanikkavu, Beypore and Chirakkal series.
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    Phosphorus fractions in relation to the genesis of some oxisols in Kerala
    (Kerala Agricultural University, 1987) Stella Jacob; Venugopal, V K
    A study was made on phosphorus fractions from six profile collected from laterite soil (Oxisols) series identified in different regions in Kerala. Fe-P formed the predominant among the active fractions on all the soils investigated except Nenmanda and Thonnackal series indicating their highly weathered nature. This was followed by Ca-P and AI-P respectively in the case ©f Anjur, Kanjikulam and Mannur series. In Kootala series, Fe-P was followed by AI-P and then Ca-P. Thonnackal series showed a predominance of Ca-P followed by Fe-P and then AI-P.
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    Comparative chemical composition of soil and gravel in some oxisols
    (Kerala Agricultural University, 1987) Stella Jacob; Venugopal, V K
    A study was made on the comparative chemical composition of soil and coarse fragment gravel in some Oxisol series identified in different regions in Kerala. The chemical composition of gravel showed a depletion of SiO, and accumulation of constituents especially Fe20s and AI203. Between sesquioxides, accumulation of Fea03 appeared to be more compared to AI203. The mean values for the profiles showed the highest accumulation of Fe203 in Thonnackal series followed by Anjur, Kanjikulam, Mannur and Kootala. High gravel/fine earth ratios of the constituents have been observed for Fe2O3. AI203, MgO, P2O5 and Na20. The gravel from the upper layers of the profile showed accumulation of constituents to a greater extent than the lower layers.
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