Browsing by Author "Sankarasubramony, H."

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    Investigations on Diseases of the Coconut Palm in Travancore - Cochin State -Studies on Soil Conditions in Relation to Disease Incidence
    (2007-02) Sankarasubramony, H.; Menon, K.P.V.; Pandalai, K.M.
    1. The coconut palm appears to thrive fairly well in all the three main soil types found in the Tra-vancore-Cochin State. 2. Disease appears in trees growing in all these soil types and the disease symptoms are uniformly thesame irrespective of the locality and nature of the soil type. 3. Compared to healthy areas the results of analysis of soil samples from diseased areas show a highly depleted condition in the major plant food factors particularly in the content of available potash. 4. The soils from diseased areas have a very low clay content and consequently a very low water holding capacity. 5. The base exchange properties of the soils from diseased areas, the composition of the clay fraction etc. reveal that the soils are of a very poor type from point of view of fertility. 6. Various factors which appear to be individually or collectively responsible for the disease incidence are discussed and future lines of work briefly indicated. 7. Additional evidence has been presented with regard to the importance of soil conditions in relation to disease incidence.
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    The Manganese Content of Soil and Plant Tissue in Relation to the Root and Leaf Diseases of the Coconut Palm
    (2007-02) Sankarasubramony, H.; Menon, K.P.V.; Pandalai, K.M.
    Data is given on the manganese contents of tissues collected from healthy and diseased coconut trees and of soils of the respective areas. The manganese contents vary between very wide ranges,from traces up to 435 p.p.m. in soils and from traces to 176.5 p.p.m. in tissue samples. These make it difficult to diagnose the disease as involving a manganese factor and there appears to be no correlation between disease incidence and manganese status of the soils and tissues of the ,coconut palm. Work to elucidate the problem further is in progress in these laboratories.
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    Observations On The Sudden Wilting Of Coconut Palms At Thottapally Spill Way Area In Travancore-Cochin
    (1954) Pandalai, K.M.; Menon, K.P.V.; Sankarasubramony, H.
    1. The cause of the sudden wilting of coconut palms in the Thottapally Spillway area, where, peaty subsoil has been dredged out and dumped on to the bases of healthy palms has been investigated and described. 2. The wilting of the palms appears to be due to their desiccation and root injury as a result of the change in the soil conditions caused among other factors viz. (a) the high acidity of ths dredged subsoil and subsoil water. (fc) the presence in it of readily oxidisable agents such as sulphides, ferrous iron etc. (c) the presence in it of toxic agents such as soluble ferrous iron and soluble aluminium (J) potential capacity of the subsoil for the formation of free mineral acids by hydrolytic changes as well and (e) complete anaerobic condition in the root rhizosphere causing intense root suffocation. 3. The cause of the wilting has been shown to be purely a physiological factor.
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    Observations on the Sudden Wilting of Coconut Palms at Thottapally Spill Way Area in Travancore-Cochin
    (2007-02) Pandalai, K.M.; Menon, K.P.V.; Sankarasubramony, H.
    1. The cause of the sudden wilting of coconut palms in the Thottapally Spillway area, where, peaty subsoil has been dredged out and dumped on to the bases of healthy palms has been investigated and described. 2. The wilting of the palms appears to be due to their desiccation and root injury as a result of the change in the soil conditions caused among other factors viz. (a) the high acidity of ths dredged subsoil and subsoil water. (fc) the presence in it of readily oxidisable agents such as sulphides, ferrous iron etc. (c) the presence in it of toxic agents such as soluble ferrous iron and soluble aluminium (J) potential capacity of the subsoil for the formation of free mineral acids by hydrolytic changes as well and (e) complete anaerobic condition in the root rhizosphere causing intense root suffocation. 3. The cause of the wilting has been shown to be purely a physiological factor.
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    On the Nutritive Contents of the Leaf Tissues of the Coconut Palm in Health and in Disease
    (2007-02) Sankarasubramony, H.; Pandalai, K.M.; Menon, K.P.V.
    1. Certain disorders, causing a sort of chlorosis and necrosis of the foliage of coconut palms in Travancore-Cochin have been investigated by foliar analysis, for potassium,calcium, magnesium, phosphorous and nitrogen. 2. Statistical examination of the data of chiemical analysis of the leaflets from different fronds, From healthy trees as well as trees in diifferent stages of the disease, showed an accumulation of the nutrient factors in the leaves from diseased trees. 3. Different aspects concerning how far possible impaired physiological processes due to disease,or inadequate translocation from the. leaf to the other parts of the plant are responsible for the observed accumulation of nutrients in the diseased leaf tissue have been briefly discussed. 4. Further work from the point of view of plant physiological aspects is now in progress.