Browsing by Author "Balagopalan, M"
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Item Changes in organic carbon and different forms of nitrogen under first and second rotation (coppiced) eucalypt plantations(Kerala Agricultural University, 1983) Balagopalan, M; Jose, A IItem Comparative study on the properties of soils in relation to vegetational types(Kerala Agricultural University, 1993) Balagopalan, M; Jose, A ISoil properties under six types of vegetative covers, evergreen, semi-evergreen and moist deciduous forests, and plantations of teak, eucalypt and rubber showed that they differed significantly. Soils in the natural forests have higher water holding capacity, cation exchange capacity, organic carbon, N, PzOs, K2O and CaO and MgO. Soils in the plantations, on the other hand, possess greater accumulation of gravel, contain highest amounts of FezOs and AhCb. Organic carbon and N contents up to an appreciable depth were considerable in soils under natural forests. It was found that growing eucalypt after clearfelling natural forests has deleterious effect on soil properties.Item Distribution of organic carbon and forms of nitrogen in soil under mahogany and teak(Kerala Agricultural University, 1982) Balagopalan, M; Jose, A IA study was made on the influence of mahogany and teak vegetation on soil characteristics, namely, pH, organic carbon and different forms of nitrogen. Soils under teak were more acidic than those under mahogany. The content of organic matter decreased with depth. Accumulation of organic matter was more under mahogany vegetation. This was true in the case of total nitrogen also. The C:N ratio of the soil was little influenced either by depth or by the type of vegetation. The ratios of total N to available N, total N to ammoniacal N and total N to nitrate N increased with increase in depth of the profile under both type of vegetation.Item Distribution of organic carbon, nitrogen, organic phosphorus and organic sulphur in the tropical and subtropical forest soils and their inter-relationships(Kerala Agricultural University, 1995) Balagopalan, M; Jose, A IItem Dynamics of organic carbon and different forms of nitrogen under first and second rotation teak plantations of Kerala(Kerala Agricultural University, 1982) Balagopalan, M; Jose, A IItem Factor analysis of soil properties in Paraserianthes Falcataria (L.) nielson plantations(Kerala Agricultural University, 1994) Rugmini, P; Balagopalan, MSoil properties in different layers viz., 0-20 cm, 20- 40 cm, 40-60 cm and 0-60 cm in Paraseriantfies falcataria plantations in Kerala were subjected to factor analysis. Out of die eleven variables studied viz., gravel, sand, pH, organic carbon, exchange acidity, exchangeable bases, total N, P, K, Ca and Mg, factor analysis identified four factors which accounted for more than 72% of the variation in these variables in each layer. The four factors were textural component, organic matter component, acidic component and nutrient capital of the soil. Certain factors in 0-20 cm, 20-40 cm and 40-60 cm layers were common with those in the 0-60 cm layer. The study indicated that it is more advisable to interpret the different factors in the 0- 60 cm layer rather than those in individual layers.Item Soil humic fractions of red ferrallitic soils as influenced by vegetational types(Kerala Agricultural University, 1993) Balagopalan, M; Jose, A IHumic and fulvic acids (HA and FA) extracted from evergreen, semi-evergreen and moist deciduous forests, and plantations of teak, eucalypt and rubber soils belonging to red ferrallitic type of Kerala were quantified and characterised by UV and IR spectroscopies. The HA and FA conlenis were relatively higher in the natural forests. They differed significantly between vegetational types and varied in chemical composition. The IR spectra of HA and FA were very weak and their aliphatic groups were lower in eucalypt soils.Item Soil properties as influenced by elevation: A factor analysis(Kerala Agricultural University, 1994) Rugmini, P; Balagopalan, MSoil properties in 0-100 cm layer of three different elevations, 150 (E,), 750 (E2) and 1450 (E,) m asl were subjected to factor analysis. Out of the nine variables studied viz., gravel, sand, pH, water holding capacity, organic carbon, cation exchange capacity, total N, P and S, factor analysis identified three factors in E, and E, and two factors in E, in the 0-100 cm layer. In E, and E, three factors accounted for 70% and 78% variations, respectively while in E; two factors accounted for 67% variation.