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Item Studies on crop population density in pineaopple var. kew (Ananas comosus Merr)(Kerala Agricultural University, 1981) Balakrishnan, S; Nayar, N K; Valsamma Mathew; Gopalakrishnan, T RItem Relative susceptibility of brinjal lines resistant to bacterial wilt (Pseudomonas Solanacearum Smith)(Kerala Agricultural University, 1985) Gopalakrishnan, T R; Gopalakrishnan, P KItem Evaluation of a few selected lines of pumpkin for local adaptability(Kerala Agricultural University, 1987) Gopalakrishnan, T R; Peter, K VItem Variability in a set of chilli lines(Kerala Agricultural University, 1987) Gopalakrishnan, T R; Gopalakrishnan, P K; Peter, K VThe study was aimed to estimate variability in the existing germplasm of chilli and to study components of variation. Significant differences were observed for many of the quantitative characters. Phenotypic coefficient of variation was maximum for fruits/plant (75.16) followed by fruit length (59.21) and main stem length (55.87). Fruit yield/plant recorded only moderate value of pcv (43.54) High heritability coupled with high genetic advance was observed for fruit length and main stem length. Fruits/plant had moderately high estimates of heritability and expected genetic advance. Days to flower, days to red chilli harvest and fruit girth having high heritability estimates had only low expected genetic advance. There is scope to evolve chilli line with long fruit aTid more fruits/plant through simple selection method.Item Effects of graded doses of nitrogen, phosphorus and potassium on yield of pumpkin (Cucurbita Moschata Poir)(Kerala Agricultural University, 1983) Rajendran, P C; Gopalakrishnan, P K; Gopalakrishnan, T R; Peter, K VItem Effect of time of sowing on incidence of mosaic in Pumpkin(Kerala Agricultural University, 1994) Latha, P; Gopalakrishnan, T RItem Seasonal variation in white fly population and its influence on the yellow vein mosaic and productivity in pumpkin (cucurbita Moschata poir)(Kerala Agricultural University, 1995) Latha, P; Gopalakrishnan, T RWhen pumpkin(O/r«rtoa moschata Poir) was sown at bimonthly interval at the College of Horticulture, Vellanikkara, incidence of yellow vein mosaic disease and population of white fly, vector of the disease, were maximum during summer. White fly populatioti was positively correlated with temperature and negatively with rainfall and relative humidity. Rainfed crops sown in the month of May was free from yellow vein mosaic disease, due to reduction in vector population during the cropping season.Item Evaluation - cabbage varieties for the high range zone of Kerala(Kerala Agricultural University, 1996) Gopalakrishnan, T R; Varghese, C A; Giridharan, M P; Devadas, V SEvaluation of cabbage varieties for five years at the Regional Agricultural Research Station, Ambalavayal resulted in the identification of a variety "September" adaptable to high altitude zones of Kerala. September is characterised by flat head with medium lightness having an average weight of 1.12 kg and diameter of 17 cm. Under the mild subtropical climate during winter, the establishment of plants and heading ability of the variety are excellent.Item Variability and divergence in pumpkin (Cucurbita moschata poir)(Kerala Agricultural University, 1996) Suresh Bahu, V; Gopalakrishnan, T R; Peter, K VFifty pumpkin genotypes evaluated during 1988-89 differed significantly in all characters except yield per plant. The coefficients of variation, heritability and genetic advance indicated that variation is mainly genetic. Genotypic coefficient of variation was maximum for seeds per fruit followed by average fruit weight and productive branches per plant. The carotene content in the genotypes ranged from 4.46 to 215/j.g per 100 g, while iron content ranged from 0.51 to 2.74 mg per 100 g. The genotypes were classified into five clusters based on Mahalanobis D2 statistics. The clusters I, II, III, IV and V contained 2, 7, 9, 12 and 20 genotypes respectively.Item Varietal screening in cabbage (Brassica Oleracea L. Var. Capitata)(Kerala Agricultural University, 1997) Gopalakrishnan, T R; George, C M