Browsing by Author "Mathew, A.S."

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    Calcium and Magnesium status of soils and leaves in relation to the root (wilt) disease of coconut
    (2007-02-08) Mathew, A.S.; Thomas Varkey
    The healthy and diseased tracts in the northern border of root (wilt) affected area in Kerala State were studied to find out how far calcium and magnesium contents of soil and leaf were involved in the development of the disease. Soil and leaf samples from healthy and diseased tracts were collected from sandy, loamy, and laterite soils covering the coastal, midland, and hilly regions, respectively. Results indicated that the status of calcium and magnesium of soil and leaf could not be considered as a factor for the incidence of roof (wilt) disease of coconut.
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    Calcium And Magnesium Status Of Soils And Leaves In Relation To The Root (Wilt) Disease Of Coconut
    (1976-12) Mathew, A.S.; Thomas Varkey
    The healthy and diseased tracts in the northern border of root (wilt) affected area in Kerala State were studied to find out how far calcium and magnesium contents of soil and leaf were involved in the development of the disease. Soil and leaf samples from healthy and diseased tracts were collected from sandy, loamy, and laterite soils covering the coastal, midland, and hilly regions, respectively. Results indicated that the status of calcium and magnesium of soil and leaf could not be considered as a factor for the incidence of roof (wilt) disease of coconut.
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    Calcium and Magnesium status of soils and leaves in relation to the root (wilt) disease of coconut
    (1976-12) Mathew, A.S.; Thomas Varkey
    The healthy and diseased tracts in the northern border of root (wilt) affected area in Kerala State were studied to find out how far calcium and magnesium contents of soil and leaf were involved in the development of the disease. Soil and leaf samples from healthy and diseased tracts were collected from sandy, loamy, and laterite soils covering the coastal, midland, and hilly regions, respectively. Results indicated that the status of calcium and magnesium of soil and leaf could not be considered as a factor for the incidence of roof (wilt) disease of coconut.
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    Effect of application of N, P, K, Ca and Mg on young West Coast Tall palms in the root (wilt) affected area
    (2007-02-08) Robert Cecil, S.; Pillai, N.G.; Mathew, A.S.; Kamalakshi Amma, P.G.
    The response to three levels of N, P and K and two levels of Ca and Mg by WCT palms from the seedling stage was studied in a 33 x 22 factorial split experiment conducted in loamy sand soil at CPCRI, Regional Station, Kayangulam since 1970. The fertiliser levels (adult) are: 500,750, 1000 g N; 300, 450, 600gP2O5; 1000, 1500, 2000 g K20; 0, 12.5 kg Ca (OH)2 and 0, 500 g MgO. The lime was applied broadcast uniformly and ploughed in, while the other fertilisers were applied only in the basins. The effect of application of N was found significant in increasing the height of seedlings during the first year but not during the later years. The main effect of P was not found favourable on any of the characters. The effect of K was significant in increasing the girth at collar only during the third year. The response to Ca was significant in increasing the height of seedlings during the third year, but was highly significant on the number of functioning leaves during the fourth year. The main effect of Mg was highly significant in increasing the girth at collar, height, number of leaves produced, number of functioning leaves, early flowering and the cumulative yield of nuts harvested upto the seventh year. Irrespective of the treatments given, 19% of the palms had contracted the root (wilt) till December, 1977.
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    Effect of major nutrients on the incidence of root (wilt) disease in coconut
    (2007-02-08) Robert Cecil, S.; Pillai, N.G.; Kamalakshi Amma, P.G.; Mathew, A.S.; Nambiar, P.T.N.
    Studies on the effect of application of N,P,K, Ca and Mg, from die time of planting in the main field at Kayangnlam, on the incidence and severity of root (wilt) disease in West Coast Tall palms indicated that, young palms are more susceptible to the disease at the onset of bearing. When young palms under good management contracted the disease before flowering, the onset of bearing was delayed by about 12 months. The frond production rate and the number of functioning leaves on the crown are considerably reduced in diseased palms. Among the nutrients, Mg significantly increased the expression of both these characters thereby preventing the reduction in growth due to the disease. The disease caused about 60 per cent reduction in yield in the early bearing period. The mean yields of healthy and diseased palms at the 10th year of planting were 58.8 and 23.8 nuts/palm respectively. The disease caused about 12 per cent reduction in copra weight per nut while the reduction in oil content was not significant.
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    Effect of major nutrients on the incidence of root (wilt) disease in coconut
    (1982-12) Robert Cecil, S.; Pillai, N.G.; Kamalakshi Amma, P.G.; Mathew, A.S.; Nambiar, P.T.N.
    Studies on the effect of application of N,P,K, Ca and Mg, from die time of planting in the main field at Kayangnlam, on the incidence and severity of root (wilt) disease in West Coast Tall palms indicated that, young palms are more susceptible to the disease at the onset of bearing. When young palms under good management contracted the disease before flowering, the onset of bearing was delayed by about 12 months. The frond production rate and the number of functioning leaves on the crown are considerably reduced in diseased palms. Among the nutrients, Mg significantly increased the expression of both these characters thereby preventing the reduction in growth due to the disease. The disease caused about 60 per cent reduction in yield in the early bearing period. The mean yields of healthy and diseased palms at the 10th year of planting were 58.8 and 23.8 nuts/palm respectively. The disease caused about 12 per cent reduction in copra weight per nut while the reduction in oil content was not significant.
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    Effect of zinc and molybdenum on root (wilt) affected coconut palms
    (2007-02-08) Mathew, A.S.; Jose, A.I.; Jose Abraham; Robert Cecil, S.; Kamalakshi Amma, P.G.
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    Effect of zinc and molybdenum on root (wilt) affected coconut palms
    (1986) Mathew, A.S.; Jose, A.I.; Jose Abraham; Robert Cecil, S.; Kamalakshi Amma, P.G.
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    Incidence of Stem Bleeding Disease of Coconut Palm in Relation to PH and Electrical Conductivity of Soils
    (1980-06) Mathew, A.S.; Ramanandan, P.L.
    Soil reaction (pH) and electrical conductivity were determined in soil samples collected from 16 stem bleeding affected areas belonging to Kerala, Tamil Nadu, Karnataka, and Goa. They were not directly related to the incidence of stem bleeding disease of coconut palm.
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    Leaf Characteristics And Dry Matter Production In Coconut (WCT And CDO X T) Grown Under Conditions Of Low And High Drought Intensities
    (1986-05) Rajagopal, V.; Kasturi Bai, K.V.; Ramadasan, A.; Balasimha, D.; Voleti, S.R.; Patil, K.D.; Sumathy Kutty Amma, B.; Varkey, T.; Mathew, A.S.; Gopalakrishnan Nair, M.
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    Manuring Coconut in Kerala
    (2007-02) Ramanandan, P.L.; Mathew, A.S.
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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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    A Note on the Nutrient Element Ratio in Relation to Foliar Yellowing in Coconut Palm
    (2007-02) Robert Cecil, S.; Pillai, N.G.; Mathew, A.S.; Kamalakshi Amma, P.G.
    The major nutrient composition of coconut leaves from healthy palms and from palms affected by foliar yellowing was studied and the role of major nutrients and their ratio on the incidence of yellowing was evaluated. The N and P contents did not differ between healthy and affected palms. The K content was higher in affected palms while the Ca and Mg contents were higher in healthy palms. Evaluation of nutrient element ratio indicated that the palms affected by foliar yellowing were in a state of unbalanced nutrition, particularly among the major cations, with wider K/Ca, K/Mg and Ca/Mg ratios compared to healthy palms.
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    Performance of Dwarf x Tall Hybrid Coconut in Root (Wilt) Affected Areas of Kerala Under Different Fertilizer Levels
    (2007-02) Kamalakshi Amma, P.G.; Robert Cecil, S.; Pillai, N.G.; Mathew, A.S.; Nambiar, P.T.N.
    A field experiment was conducted to study the performance of Dwarf X Tall hybrid coconut palms under different fertilizer levels in the root (wilt) disease affected area. With the lowest level of fertilizer application, an average yield of 120 nuts/palm/year was obtained. 500 g N, 300 g P205 1000 g K20 with 500 g Mg O could be taken as the ideal dose of fertilizer application in the early bearing periods under rainfed conditions. About 22 per cent of the total palms had contracted root (wilt) disease at the end of ninth year from planting.
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    Performance of Dwarf X Tall Hybrid Coconut on Root (Wilt) Affected Areas of Kerala Under Different Fertilizer Levels
    (1984) Kamalakshi Amma, P.G.; Robert Cecil, S.; Pillai, N.G.; Mathew, A.S.; Nambiar, P.T.N.
    A field experiment was conducted to study the performance of Dwarf X Tall hybrid coconut palms under different fertilizer levels in the root (wilt) disease affected area. With the lowest level of fertilizer application, an average yield of 120 nuts/palm/year was obtained. 500 g N, 300 g P205 1000 g K20 with 500 g Mg O could be taken as the ideal dose of fertilizer application in the early bearing periods under rainfed conditions. About 22 per cent of the total palms had contracted root (wilt) disease at the end of ninth year from planting.
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    Reproduction of Symptoms of Root (Wilt) Disease of Coconut in Potted Coconut Seedlings
    (1976-12) Mathen, K.; Gopinathan Pillai, N.; Mathew, A.S.; Shanta, P.
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    Short Scientific Notes: Reproduction of Symptoms of Root (Wilt) Disease of Coconut in Potted Coconut Seedlings
    (1976-12) Mathen, K.; Gopinathan Pillai, N.; Mathew, A.S.; Shanta, P.
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    Soil Condition and Nutritional Factors
    (2007) Pillai, N.G.; Kamalakshi Amma, P.G.; Mathew, A.S.; Robert Cecil, S.