Browsing by Author "Sankarasubramoney, H."
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Item Studies on soil conditions in relation to tha "Root" and "Leaf" diseases of the coconut palm in Travancore- Cochin Part VI. The combined water, hygroscopic water, loss on ignition and water-table aspects of coconut soils(1959) Pandalai, K.M.; Menon, K.P.V.; Sankarasubramoney, H.1. The results of studies on some aspects of moisture availability, moisture excess and moisture deficiency as well as water-table of soils in the healthy and diseased areas in relation to the incidence of the root and leaf diseases of the coconut palms have been presented and discussed. 2. A higher percentage of combined water in the healthy areas in sandy, red loam and laterite areas compared to diseased areas (the reverse being the case in the alluvial loams) as well as a higher percentage of hygroscopic moisture in the healthy areas in red loam and laterite were found to be rather characteristic. 3. From the facts that a large proportion of the areas where the disease is prevalent have high water tables, it has to be concluded that water logging of the soil is a prominent factor which predisposes disease conditions in the palms. 4. The need for providing facilities for preventing water logging of coconut soils by securing good drainage conditions and preventing continued water stagnation at the root zone has been emphasised.Item Studies on soil conditions in relation to the "Root" and "Leaf" diseases of the coconut in Travancore- Cochin . Part VII. The mechanical composition of coconut soils of healthy and diseased areas(1959) Pandalai, K.M.; Menon, K.P.V.; Sankarasubramoney, H.1. The results of studies on the mechanical composition of soils from healthy and diseased coconut areas in relation to the root and leaf diseases of the coconut palms have been presented and discussed. 2. The disease appears to be prevalent in all the main soil types on which coconuts are found to grow. Since the results presented do not show any significant differences in the mechanical composition of soils from the two different categories of soils, healthy and diseased although there are slight differences in the different soil types, it would appear that differences in the mechanical composition are not responsible for predisposing conditions for the disease attack. 3. The need, however, for a free working soil with good drainage and free water movement in the soil as well as the presence of higher fine sand, silt and clay fractions and the absence of any impermeable or compact layer or hard pans near the surface soil likely to cause water stagnation etc., has been emphasised for maintaining the palms in good healthy conditionsItem Studies on soil conditions in relation to the "Root" and "Leaf" diseases of the coconut palm in Travancore - Cochin. Part V. Exchangeable cations, cation exchange capacity and pH of coconut soils(1958) Sankarasubramoney, H.; Pandalai, K.M.; Menon, K.P.V.(i) The results of studies on the exchangeable cations, exchangeable hydrogen, percentage base saturation and the pH of coconut soils from healthy as well as root and leaf infected areas have been presented and discussed. (ii) Soils belonging to the sandy, alluvial loam and red loam from healthy localities exhibit comparatively higher values for exchangeable cations and percentage base saturation and, consequently, low values for exchangeable hydrogen than from the diseased areas. The difference between the healthy and diseased areas in the three types of soils is significant enough leading to the conclusion that these factors may be positively correlated with disease incidence. The case of laterite soils appears to be slightly different. (iii) Soils of the diseased areas have definitely lower hydrogen ion concentrations than the corresponding soils of the healthy areas. (iv) The various effects of low pH values of soil which might directly and indirectly orientate healthy conditions in the palms have been briefly discussed. (v) The possible adverse influences which water logging of the soil may bring about, particularly the formation of increased total acidity have been pointed out. (vi) The conclusion appears to be justified that there is urgent need for regulated liming of coconut soils, especially in the root and leaf infected areas of Travancore-CochinItem Studies on soil conditions in relation to the "Root" and "Leaf" diseases of the coconut palm in Travancore-Cochin Part VI. The combined water, hygroscopic water, loss on ignition and water-table aspects of coconut soils(1959) Pandalai, K.M.; Sankarasubramoney, H.; Menon, K.P.V.Item Studies on soil conditions in relation to the "Root" and "Leaf" diseases of the coconut palm in Travancore-Cochin Part VII. The mechanical composition of coconut soils of healthy and diseased areas(1959) Pandalai, K.M.; Sankarasubramoney, H.; Menon, K.P.V.Item Studies on soil conditions in relation to the "Root" and "Leaf" diseases of the coconut palm in Travancore-Cochin. Part IV. Total and exchangeable calcium and magnesium contents of coconut soils(1958) Pandalai, K.M.; Menon, K.P.V.; Sankarasubramoney, H.(1) The results of studies on the total and exchangeable calcium as well as the total and exchangeable magnesium contents of healthy and diseased coconut soils have been presented and discussed. (2) Total calcium content is, in general, lower in the diseased areas as compared to healthy areas. (3) Values for total exchangeable bases are lower in the diseased areas than the healthy areas. (4) No definite conclusion regarding the role of magnesium in relation to the disease condition of the trees could be drawn, although it is clear that either lack of or non-availability of the nutrients in the soil is tied up with it. (5) The need for a systematic observational trial involving potassium, calcium and magnesium manuring of the attacked palms for assessing the interrelationships of these cations in the soil and the palm tissue in relation to the disease conditions has been emphasised.Item Studies on soil conditions in relation to the "Root" and "Leaf" diseases of the coconut palm in Travancore-Cochin. PartV. Exchangeable cations, cation exchange capacity and pH of coconut soils(1958) Pandalai, K.M.; Sankarasubramoney, H.; Menon, K.P.V.Item Studies on Soil Conditions in Relation to the 'Root' and 'Leaf' Diseases of the Coconut Palm in Travancore - Cochin. Part III. Total available and exchangeable potassium contents of coconut soils(1955) Sankarasubramoney, H.; Pandalai, K.M.; Menon, K.P.V.(1) Careful analysis of soil samples has shown that there is a signi- ficant difference between healthy and -diseased areas in their status of available and exchangeable potassium. There is a higher concentration of these factors in the samples from healthy areas, as compared to samples from diseased areas, although the difference is not so marked in the case of exchangeable potassium. (2) The symptoms exhibited by palms affected by 'root' disease appear to have resemblance to those generally attributed to a deficiency of potassium. (3) Lack of accumulation of potassium in the leaf tissues of diseased palms as evidenced by leaf analysis, tends to give support to the conclusions mentioned earlier. (4) Pot culture and field trials are considered necessary before these conclusions can be considered as final These trials are in progress.Item Studies on Soil Conditions in Relation to the Root and Leaf Diseases of the Coconut Palm in Travancore - Cochin. Part III. Total available and exchangeable potassium contents of coconut soils(1955) Sankarasubramoney, H.; Menon, K.P.V.; Pandalai, K.M.Careful analysis of soil samples has shown that there is a significant difference between healthy and diseased areas in their status of available and exchangeable potassium There is a higher concentration of these factors in the samples from healthy areas, as compared to samples from diseased areas, although the difference is not so marked in the case of exchangeable potassium. (2) The symptoms exhibited by palms affected by root disease appear to have resemblance to those generally attributed to a deficiency of potassium. (3) Lack of accumulation of potassium in the leaf tissues of diseased palms as evidenced by leaf analysis, tends to give support to the conclusions mentioned earlier. (4) Pot culture and field trials are considered necessary before these conclusions can be considered as final- These trials are in progress.Item Studies On Soil Conditions In Relation To The Root And Leaf Diseases Of The Coconut Palm In Travancore-Cochin : Part II. Total Phosphoric Acid, Available Phosphoric Acid And Iron Content Of Coconut Soils(1955) Sankarasubramoney, H.; Menon, K.P.V.; Pandalai, K.M.Soils from diseased and healthy areas have been examined for both total and available phosphorus and total iron. The conclusions arrived at are:— (1) There is no significant difference between healthy and diseased areas, in the phosphoric acid status of the soil (total and available). (2) Although soils from healthy areas have a higher content of total iron, as compared to soils of diseased areas, it cannot be concluded that there is an iron deficiency condition in diseased areas, since the quantity of available iron could not be determined. Whether such a deficiency actually exists, has to be found out by other means. (3) Fixation of phosphorus by iron, and consequent non-availability of phosphorus, does not appear to be a factor correlated with disease incidence, since it is obvious that a greater quantity of phosphorus would be rendered unavailable in healthy soils, due to their higher content of iron.Item Studies on Soil Conditions in Relation to the “Root” and “Leaf” Diseases of Coconuts in Travancore-Cochin : Part I Nitrogen, Organic Matter Content and Carbon/Nitrogen Ratio of Coconut Soils(2007-02) Sankarasubramoney, H.; Pandalai, K.M.; Menon, K.P.V.1. Detailed studies on the soil conditions in relation to the diseases of the coconut palm in Travancore-Cochin have been undertaken and comparative analytical data of soils of representative diseased and healthy areas for nitrogen, soil organic matter and carbon nitrogen ratio with special reference to soil types have been presented. 2. There is no indication from the results that these factors have any significant influence in orientating the disease conditions of the palms, in spite of their intimate association with soil fertility. 3. The above does not preclude certain indirect ways in which these factors may exercise their influence as predisposing factors for disease attack.