Browsing by Author "Nair, B.P."
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Item Biomass estimation of cocoa plant by regression analysis(2007-02-08) Balasimha, D.; Nair, B.P.Item Effect of season position and age of leaf on the major nutrient composition of cashew(2007-02-08) Harishu Kumar, P.; Rakiappan, P.; Nair, B.P.; Mohan, E.; Nagabhushanam, S.Item Frequency of occurrence and intensity of yellow leaf disease of arecanut (Areca catechu L.) in relation to water table(2007-02) Chandra Mohanan, R.; Nair, B.P.Among the diseases affecting areca palm (Areca catechu L), yellow leaf disease is one of the most important diseases based on the nature of the disease and extent of damage. Its etiology is unknown. During the present survey, 18 per cent of the palms in Trichur district (Kerala State) were found to be affected by the disease. The severity of the disease varied. In areas where the water table was above 7-5/77, the disease was noticed in 20 per cent of the palms- In areas where the water table was 1.5 to 3m below ground level the disease was observed in 20 per cent of the palms and only in 12 per cent of the palms where the water table was below 3 m. Log-likelihood ratio test conducted to examine the relationship between water table and disease incidence showed that the disease incidence was not independent of water table.Item Impact of seednut selection on heritability, genotypic and phenotypic correlations in arecanut(1985) Bhagavan, S.; Bavappa, K.V.A.; Ramachander, P.R.; Nair, B.P.; Ratnambal, M.J.The heritability studies on the six morphological characters and two yield characters in arecanut were carried out for the data derived from unselected nuts from selected mother palms and selected nuts from selected mother palms in order to see the impact of seednut selection. The yield characters recorded a very low heritability. However, the selection of seednuts increased the heritability from .05 to 0.25 in the case of number of nuts and 0.08 to 0.29 in the case of weight of nuts. The other morphological characters exception height and Bomber of leaves showed increased heritability due to seednut selection. The impact of seed nut selection on yield was further established by the high genotypic and phenotypic correlations for the yield characters with seed weight, seedling girth and age at 1st flowering thereby highlighting the importance of seednut selection.Item Mass Pedigree Selection in Arecanut (Arecacatechu L). A Case History on the Application of the Method in a Perennial Tree Crop(2007-02) Ravindran, P.N.; Bavappa, K.V.A.; Pillai, R.S.N.; Ramachander, P.R.; Nair, M.K.; Nair, B.P.; Vijayakumar, K.This paper deals with the results of a mass pedigree selection experiment carried out in the South Kanara cultivar of arecanut. The data collected from the experiment has been utilised for various genetical studies, such as correlated responses, genotypic and phenotypic correlations, path coefficient analysis, heritability, and genetic gain achieved through selection. The results of these analysis are presented and discussed.Item Seasonal fluctuations in the major nutrient composition of cashew leaf tissue (Anacardium occidentale L)(1982) Harishu Kumar, P.; Murthy, K.N.; Nair, B.P.Item Specific Gravity of Seeds as a Mass Selection Criterian in Cashew(1984) Menon, M.A.; Ravindran, P.N.; Nair, B.P.Item Standardisation of Leaf Sample Size for NPK Analysis in Cashew(Anacardium Occidentale L.)(1982) Harishu Kumar, P.; Nair, B.P.; Murthy, K.N.Item Variation in mineral composition of leaves of cashew (anacardium occidental L.)as affected by season,position and age(1982) Harishu Kumar, P.; Nair, B.P.; Rakhiappan, P.; Nagabhushanam, S.; Mohan, E.Flowering and fruiting had a depressive effect on the major nutrient composition of cashew leaves Leaves of top portions did not vary in their N P K contents with that of lower portions. Freshly matured leaves, emerged after fruiting recorded higher contents of NPK than the matured leaves of previous season. The variation among the trees with respect to NPK contents of freshly matured leaves is less as compared to older leaves.Item Vigour Index As An Additional Parameter In Identifying Elite Palms In Arecanut(1989) Bhagavan, S.; Nair, B.P.Multiple regression and path analysis was attempted to study the causal relationship of the yield and ten vigour variables for the local South Kanara variety of arecanut. Palm height, internodal distance at permanent mark and maximum length of leaf sheath showed high correlations and high direct effects, whereas the girth at permanent mark had a high negative direct effect, but its positive correlation with yield was largely due to highly positive indirect effect via palm height, thereby indicating the importance of these four vigour variables in identifying the actual potential elite areca palms. A vigour index is formulated by regressing these four selected variables on the yield and a selection criterion is proposed to select elite areca palms using yield and vigour index.Item Yellow leaf spot of Cashew(1979) Menon, M.A.; Chandra Mohanan, R.; Harishu Kumar, P.; Rakkiyappan, P.; Nair, B.P.