Browsing by Author "Balakrishnan, R."

Now showing 1 - 6 of 6
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    The economic viability of three insecticides in the control of pollu beetle (Longitarsus nigripennis Mots.) in black pepper
    (2007-02-08) Balakrishnan, R.; Prem Kumar, T.; Devasahayam, S.
    A suitable choice of insecticides for different levels of infestation by pollu beetle (Longitarsus nigripennis Mots.) in black pepper has been worked out based on a multilocation trial involving three insecticides namely, endosulfan, quinalphos and methyl parathion.
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    Estimates on the extent of loss due to quick wilt disease of black pepper (Piper nigrum L.) in Calicut district of Kerala
    (2007-02) Balakrishnan, R.; Anandaraj, M.; Nambiar, K.K.N.; Sarma, Y.R.; Brahma, R.N.; George, M.V.
    A survey was conducted in Calicut district of Kerala State (India) to assess the extent of loss in yield due to quick wilt disease of black pepper. The study was conducted for a period of three years (1982-1984) and it was estimated that on an average about 1,88,900 vines perish due to quick wilt disease per year and the consequent yield loss amounting to about 119 metric tonnes of black pepper per year. It was also estimated that a total of 11 % of plants were lost due to the disease during the course of three years (1982-1984)
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    Leaf area and shoot dry weight in coconut seedling selection
    (2007-02) Ramadasan, A.; Satheesan, K.V.; Balakrishnan, R.
    Path-coefficient analysis was used to assess the contribution of various seedling characters that are presently employed for selection of coconut seedlings from 1-year-old nursery. The girth at collar and the leaf area, contributed mostly to the dry weight of shoot. The number of leaves and the height of seedlings did not significantly contribute to vigour. A simple multiple linear regression equation was worked out for estimating the dry weight of shoot non-destructively. The girth at collar and the leaf area were found to be the most important characters to be considered in selection and breeding.
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    Multiple Regression Analysis in Cultivars of Zingiber Officinale Rosc.
    (2007-02) Ratnambal, M.J.; Balakrishnan, R.; Nair, M.K.
    The linear relationship between the morphological characters like height of pseudostem, number of leaves and the breadth and length of last fully opened leaf and yield was studied in 23 cultivars of ginger by multiple regression technique. Based on the morphological characters, the final yield could be predicted fairly accurately with an R2 of 73 percent. The partitioning of phenotypic correlation between yield and the morphological characters into direct and indirect effects by the method of path coefficient analysis revealed that the character plant height exhibited a high direct effect as well as high indirect effect in the establishment of correlation between yield and other morphological characters.
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    A Technique For Estimating Yield In Black Pepper (Piper Nigrum L.)
    (1986-12) Balakrishnan, R.; Jose Abraham
    A technique for visually scoring for yield of pepper plants was standardised. It was found that yield of pepper plants could be estimated with a high R2 value (R2 = 0.81) using visual yield score as a predictor variable. It was established that by using visual yield score as an ancillary variable in a double sampling scheme, the cost of yield estimation could be reduced by half in comparison to that of simple random sampling for estimating the yield of pepper plantations with a given accuracy. The technique for visually scoring for yield of pepper was field tested and it was found that the method could be adopted with very minimum training to the investigators.