Browsing by Author "Kamala Devi, C.B."

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    Available micronutrient status of major soil types under coconut in healthy and root (wilt) affected tracts of Kerala, India
    (2007-02-08) Pillai, N.G.; Kamala Devi, C.B.; Wahid, P.A.; Nambiar, C.K.B.
    A survey of coconut plantation in Kerala State was carried out. In this, 733 surface soil samples were collected at about 6.5 km intervals and analyzed for available micro nutrients in five major soil types. Because of the low values encountered in a majority of cases, the following soil types are more likely to be deficient of certain elements : coastal sandy and reclaimed marshy soils for Mn, sandy loam soils for Zn, sandy loam and coastal sandy soils for Mo, and coastal sandy soils for B. The distribution of available Cu was uniform in the different soil types excepting coastal sandy soils. The root (wilt) disease affected tracts showed a significant reduction: in the levels of the following micronutrients as compared to healthy tract : Fe, Mn, and Zn in laterite, reclaimed marshy; and coastal sandy soils ; Zn in alluvial soils ; and Mn and Zn in sandy loam soils. The variation in Cu, B, and Mo content in the different soil types between healthy and disease affected tract was negligible. The intensity of deficiency of Mo, Zn, and Mn was 83, 48, and 48 per cent, respectively. The intensity of deficiency of Zn was above 47 per cent in all soil types in only the disease affected tract and that of Mo above 60 per cent in both healthy and disease affected tracts.
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    Cation, exchange capacity of excised roots of coconut seedling
    (1973-08) Pillai, N.G.; Abdul Wahid, P.; Kamala Devi, C.B.
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    CEC of coconut pollen grains
    (1977) Wahid, P.A.; Mohammed Sayed, A.A.; Kamala Devi, C.B.
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    Changes in the chemical composition of nut water and kernel during development of coconut
    (2007-02-08) Kamala Devi, C.B.; Velayutham, M.
    Maximum quantity of nut water was observed in six month old nuts. The sugar content of the nut water and kernel were maximum in eight month old nuts. Potassium was the predominant ion in nut water. With gradual decrease in acidity (free fatty acids) of nut water and sugar content of nut water and kernel, there was increase in oil content. The level of different constituents in nut water and kernel and their relative changes were similar in the different genotypes.
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    Discriminant classification of Kerala soils in relation to incidence of coconut root - (wilt) disease: 1. Soil micronutrient aspects
    (2007-02-08) Kamala Devi, C.B.; Narasimhayya, G.; Wahid, P.A.; Nambiar, C.K.B.; Pillai, N.G.; Sharma, S.P.; Velayutham, M.
    The analysis of the nutrient data on the soil samples in Kerala collected from the different root (wilt) disease categories depending on the condition of the palm and the area sampled suggested the list of essential nutrients for the discrimination of the soils associated with the categories in different soil types as: 1. Latcritc — Fe, B, Mn, 1 Mo, Cu, S and Zn 2. Alluvial Fe, Mo and Zn 3. Reclaimed marshy — Fe, Zn, Cu, Mo , Mn and B 4. Coastal Sand - Fe, Zn, Cu and Mo 5. Sandy loam - Mn, Cu and Zn The classificatory analysis of the above data on the essential nutrients showed that soils of the above categories can be grouped into three clusters namely Healthy, leading to sick and sick in case of laterite, reclaimed marshy, sandy loam and two clusters as follows: healthy and sick in case of alluvial and coastal sandy soils.
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    Effect of NPK fertilisers on trace element nutrition of three coconut genotypes
    (1975) Kamala Devi, C.B.; Wahid, P.A.; Pillai, N.G.; Sankaranarayanan, M.P.
    The micronutrient status of soil and leaf was studied in three coconut genotypes, West Coast Tall, Tall x Dwarf, and Dwarf x Tall, receiving three levels of NPK fertiliser combinations. The lowering of pH by NPK treatments enhanced the availability of Mn, Fe, and Al in soil. However, only Mn was taken up by the palm in larger amounts. Water soluble Mn in soil was highly correlated with plant uptake. The micronutrient requirements of the three genotypes were similar. Zn and Cu requirements of the palm were increased by increased NPK application. The implication of enhanced micronutrient availability in soil following NPK fertilization is discussed.
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    Effect of NPK fertilisers on trace element nutrition of three coconut genotypes
    (2007-02-08) Kamala Devi, C.B.; Wahid, P.A.; Pillai, N.G.; Sankaranarayanan, M.P.
    The micronutrient status of soil and leaf was studied in three coconut genotypes, West Coast Tall, Tall x Dwarf, and Dwarf x Tall, receiving three levels of NPK fertiliser combinations. The lowering of pH by NPK treatments enhanced the availability of Mn, Fe, and Al in soil. However, only Mn was taken up by the palm in larger amounts. Water soluble Mn in soil was highly correlated with plant uptake. The micronutrient requirements of the three genotypes were similar. Zn and Cu requirements of the palm were increased by increased NPK application. The implication of enhanced micronutrient availability in soil following NPK fertilization is discussed.
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    Effects of discontinuation of fertiliser application on the NPK nutrition of coconut palm
    (1975) Wahid, P.A.; Kamala Devi, C.B.; George Philip; Pillai, N.G.
    The effect of discontinuing fertiliser application for one year on the NPK nutrition of coconut palms which have been receiving the annual recommended fertiliser dose fcr the last 15 years was studied. High residual accumulation of soil nutrients, especially P and K, was noticed in soil basins consequent 01 the long continued fertiliser application. Discontinuation of fertilisation brought down the levels of N and Kin leaf and exchangeable K ii soil, while soil and leaf P levels remained unaffected. It is suggested that once a good soil build up of P has been attained following annual . . P-application it might be possible to discontinue P-application for certain number of years or readjust the recommended dose by decreasing the quantity of added P without affecting P nutrition of the palm
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    Effects of discontinuation of fertiliser application on the NPK nutrition of coconut palm
    (2007-02-08) Wahid, P.A.; Kamala Devi, C.B.; George Philip; Pillai, N.G.
    The effect of discontinuing fertiliser application for one year on the NPK nutrition of coconut palms which have been receiving the annual recommended fertiliser dose fcr the last 15 years was studied. High residual accumulation of soil nutrients, especially P and K, was noticed in soil basins consequent on the long continued fertiliser application. Discontinuation of fertilisation brought down the levels of N and Kin leaf and exchangeable K in soil, while soil and leaf P levels remained unaffected. It is suggested that once a good soil build up of P has been attained following annual . P-application it might be possible to discontinue P-application for certain number of years or readjust the recommended dose by decreasing the quantity of added P without affecting P nutrition of the palm
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    Elimination of acid drift during potentiometric measurement of root-CEC
    (1973-06) Wahid, P.A.; Pillai, N.G.; Kamala Devi, C.B.
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    Inter-Relationships among Root Cec, Yield and Mono- and Divalent Cations
    (2007-02) Wahid, P.A.; Pillai, N.G.; Kamala Devi, C.B.
    A study was conducted on different yield groups of coconut palm (West Coast Tall) to investigate the relationships among root CEC, yield and mono-and divalent cations. The results showed that correlation between root CEC and yield was negative but not significant. The foliar content of (K + Na) decreased with increase in root CEC while (Ca + Mg) increased with increase in root CEC. The uptake of cations by the palm was found to be governed by their ratios in soil. Highly significant correlations were obtained between K/Na, K/(Ca + Mg) and K/Mg in soil and their corresponding ratios in the leaf. Among the nutrients studied, potassium content of soil as well as that of leaf correlated positively with yield. The critical level of K, 0.8 to 1.0 per cent, was found to hold good in coconut. The interaction between leaf nutrients showed that the leaf potassium level was affected by the combined level of (Na + Ca + Mg). The impact of this interaction on critical levels of Na, Ca and Mg is discussed. Based on this, a level of 43.8 to 47.3 me per 100 g (or 0.75 to 0.82 per cent) was suggested as satisfactory level for (Na -f- Ca -f- Mg) together. The negative correlation of root CEC and positive correlation of both soil and leaf potassium with yield, indicate the role of potassium in increasing the yield of coconut.
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    Mineral Nutrition of Root (Wilt) Affected Coconut Palm
    (2007-02) Pillai, N.G.; Balakrishnan Nambiar, C.K.; Mathew, A.S.; Kamalakshi Amma, P.G.; Robert Cecil; Ramanandan, P.L.; Kamala Devi, C.B.; Wahid, P.A.
    The mineral nutrition of root (wilt) affected coconut palm was thoroughly investigated by carrying out a nutritional survey, collecting soil and leaf samples of perfeotly healthy and diseased palms covering all the major coconut growing soil groups of Kerala State. The chemical analyses of these samples for both macro and micronutrients confirmed the accumulation of NPK in diseased palms. Nitrogen status of soils of disease affected tracts is higher -than that of Healthy soils. Among the secondary nutrients, deficiency of S is. evident. Imbalances in cationio ratios viz. K/Na, K/Mg, K/(Ca+Mg) and K/(Na+Ca+Mg): and anionio ratios via. P/S and N/S are quite apparent. Similarly, the defioienoies of Fe, Mn, Mo and Zn in particular in diseased palms are the other findings of great importance.
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    Mineral Nutrition of Root (Wilt) Affected Coconut Palm
    (1975-09) Pillai, N.G.; Balakrishnan Nambiar, C.K.; Mathew, A.S.; Kamalakshi Amma, P.G.; Robert Cecil, S.; Ramanandan, P.L.; Kamala Devi, C.B.; Wahid, P.A.
    The mineral nutrition of root (wilt) affected coconut palm was thoroughly investigated by carrying out a nutritional survey, collecting soil and leaf samples of perfeotly healthy and diseased palms covering all the major coconut growing soil groups of Kerala State. The chemical analyses of these samples for both macro and micronutrients confirmed the accumulation of NPK in diseased palms. Nitrogen status of soils of disease affected tracts is higher -than that of Healthy soils. Among the secondary nutrients, deficiency of S is. evident. Imbalances in cationio ratios viz. K/Na, K/Mg, K/(Ca+Mg) and K/(Na+Ca+Mg): and anionio ratios via. P/S and N/S are quite apparent. Similarly, the defioienoies of Fe, Mn, Mo and Zn in particular in diseased palms are the other findings of great importance.
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    Nutritional Studies on High Yielding Coconut Genotypes
    (2007-02) Kamala Devi, C.B.; Nelliat, E.V.; Pillai, N.G.
    Nutrient composition of leaves and available, nutrient status of soil (0-50 cm) of a five-year-old coconut plantation were evaluated from a field experiment, consisting of three levels of fertilizers and three high yielding coconut genotypes, viz., high yielfinhg Tall, Tall xDwarf and Dwarf x Tall conducted in the acid sandy loam soil of Central Plantation Crops Research Institute, Kasaragod. N and K contents ofleavesaveraged over genotypes for fertilizers increased significantly from 1.40 and 0.46 per cent of dry matter in the no fertilized plots, tol-55andO-92per cent respectively in plots receiving highest amount offertilizers (1-0 kg N, 10 kg P2O6 and 20kgKaO per tree in an year). There was an inverse relationship between K and Mg content of leaves but Ca content did not vary much- Leaf P content did not increase significantly. However, available Pin surface soil of highest: fertilizer treatment increased significantly (131 ppm) over that of no fertilizer (20 ppm), whereas the corresponding values of exchangeable K increased from 23 to 59 ppm. But available nitrogen in soil did not vary. The variations between genotypes and genotype X fertilizer interaction were nonsignificant.
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    The occurrence of phosphatic sands in Lakshadweep Islands
    (1978-03) Singh, K.D.; Kamala Devi, C.B.; Velayutham, M.
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    Pottassium Dihydrogen Ortho Phosphate, A Substitute for Ortho Phosphoric Acid in Manganese Estimation
    (1974-06) Kamala Devi, C.B.; Pillai, N.G.; Abdul Wahid, P.
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    Soil and Leaf Analyses in Relation to the Nutrition of High Yielding Coconut Genotypes
    (1976) Kamala Devi, C.B.; Velayutham, M.; Haridasan, M.
    Seasonal changes in the nutrient composition of index- leaf and available nutrien status of a ten year old coconut planatation on acid sandy loam soil were evaluated in three high yielding coconut genotypes (West Coast Tall, Tall x Dwarf, and Dwarf x Tall) growing under three fertilizer levels. Seasonal changes in leaf nutrients status confirmed that the fourteenth leaf could be taken as the index leaf under the local conditions. Available K was a limiting nutrient which was reflected in deficient K concentration in leaf of control plots. An inverse relationship between K and Mg content of leaf was observed. Leaf concentration of N was not significantly influenced by fertilization. Even at the highest level of fertilizer application was below the critical limit proposed by IRHO. However, yield data indicated that the critical limit could possibly be lowered to suit the West Coast of India conditions. No significant variation was observed in P content of leaves due to fertilisers or genotypes. Fixation of P in the soil, appeared to be accentuated during monsoont months. NPK fertilization increased the concentrations of Mn, Zn, Fe, and Cu in the leaf while that of Ca, S, Fe, B, and Mo were unaffected.