Browsing by Author "Robert Cecil"

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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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    Trend In Yield Of Root (Wilt) Affected Coconut Palms (Cocos Nucifera Linn.)
    (1987) Jose Abraham; Rawther, T.S.S.; Jacob, P.M.; Robert Cecil
    Correlation and regression studies were carried out on yield and disease index of root (wilt) affected coconut palms. The significant negative correlations obtained between, yield and disease index revealed the debilitating impact of the disease on yield. Regression equations fitted on data collected from 500 palms aged above 30 years in the farmers field showed an average reduction of O.S nuts per index while it was 1.3 nuts per index for the younger palms (aged below 13 years) under the well managed farm conditions. This indicates that the impact of disease is more in the case of palms which contract disease during the early years of bearing. However, the average yield of the palms under the well managed conditions were consistantly high upto the index level of 50 points, showing the effect of good management on maintaining the yield.
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    Trend in Yield of Root (Wilt) Affected Coconut Palms (Cocos Nucifera Linn.)
    (1987) Jose Abraham; Rawther, T.S.S.; Jacob, P.M.; Robert Cecil
    Correlation and regression studies were carried out on yield and disease index of root (wilt) affected coconut palms. The significant negative correlations obtained between, yield and disease index revealed the debilitating impact of the disease on yield. Regression equations fitted on data collected from 500 palms aged above 30 years in the farmers field showed an average reduction of O.S nuts per index while it was 1.3 nuts per index for the younger palms (aged below 13 years) under the well managed farm conditions. This indicates that the impact of disease is more in the case of palms which contract disease during the early years of bearing. However, the average yield of the palms under the well managed conditions were consistantly high upto the index level of 50 points, showing the effect of good management on maintaining the yield.