2. Institutional Publications
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Item Variability and heritability of yield and quality components in the ratoon crop of sugarcane(Kerala Agricultural University, 1990) Sreekumar, S G; Gopinathan Nair, V; Sukumaran Nair, SEvaluation of the first ratoon crop of 48 hybrid sugarcane varieties in RED with three replications at the Sugarcane Research Station, Thiruvalla revealed that certain characters viz., germination count on the 45th day, shoot count on the 180th day, number of millable canes per plot and cane yield per plot had high genotypic coefficient or variation, heritability in the broad sense and genetic advance. Hence they are amenable to genetic improvement through selection and may be considered as dependable selection criteria for the improvement of cane and sugar yields in the first ratoon crop of sugarcane.Item Inter-relations of yield and its components in sesame(Kerala Agricultural University, 1990) Sverup John; Gopinathan Nair, VOne hundred sesame types were evaluated in replicated trials in rice fallows. There was positive and significant genotypic correlation of yield of seeds with number of capsules on branches, number of capsules per plant, number of branches, number of fruiting axils per unit length and weight of 1000 seeds. Number of days to flowering, maturing, height of the plant, height up to first capsule, length and circumferance of capsule and number of seeds per capsule exerted negative and significant genotypic correlation with yield of seeds. The quality characters such as seed oil content and seed protein content did not have significant genotypic correlation with yield of seeds. The maximum positive direct effects on yield of seeds was exerted through number of capsules per plant followed by number of branches. The indirect effects of other characters via. these characters on yield of seeds were considerable. Hence it can be inferred that number of capsules per plant and number of branches are to be given importance in selection programme. The proposed plant architecture for higher productivity during summer can be dwarf in stature, profuse branching, early flowering and maturing, bearing large number of capsules with large sized seeds.Item Genetic evaluation of pre-release cultures and varieties of rice for yield, sheath blight and sheath rot diseases(Kerala Agricultural University, 1992) Sreekumar, S G; Gopinathan Nair, V; Balakrishnan Asan, R; Manikantan Nair, PItem TG-3, a variety of groundnut suitable for cultivation under partial shade in coconut gardens(Kerala Agricultural University, 1991) Sreekumar, S G; Gopinathan Nair, V; Saraswathy, PComparative evaluation of eight varieties of groundnut was conducted at the Regional Agricultural Research Station of NARP (SR), College of Agriculture, Vellayani for three years during 1984, 1986 and 1987 kharif seasons. The field experiment ( 8 x 3 RBD) was conducted at the interspaces of coconut garden under partial shade for identifying a suitable groundnut variety with high yield and shade tolerance. The pooled analysis of the data for three years revealed that the variety TG 3 was consistently superior in dry pod yield. Therefore, it was recommended for inclusion in the package of practices recommendations of the Kerala Agricultural University as a suitable variety for cultivation as intercrop in coconut garden under partially shaded conditions.Item Genetic parameters for groundnut in summer rice fallows(Kerala Agricultural University, 1991) Pushkaran, K; Gopinathan Nair, VGenetic parameters for 15 metric characters in 80 divergent varieties of groundnut grown in the summer rice fallows were estimated. The varieties differed significantly in respect of all the characters. The pcv was higher than gcv for all the characters. High estimates of gcv, heritability and genetic advance were obtained for number of branches, flowers and leaves, spread of flowering and 100 pod weight whereas the values were low for fresh weight of pods and dry pod yield. So also the high pcv for dry pod yield suggests that the genetic improvement for the economic trait through selection for summer rice fallows is meagre. Oil content, shelling percentage and duration up to flowering and maturity registered high heritability, but low genetic advance.Item Correlation studies in black gram under partially shaded conditions(Kerala Agricultural University, 1992) Saji T Abraham; Sreekumar, S G; Saraswathy, P; Gopinathan Nair, V; Manikantan Nair, PItem Path analysis for harvest index in black gram(Kerala Agricultural University, 1992) Saji T Abraham; Sreekumar, S G; Saraswathy, P; Gopinathan Nair, V; Manikantan Nair, PItem Variability in black gram under partially shaded conditions(Kerala Agricultural University, 1992) Saji T Abraham; Sreekumar, S G; Saraswathy, P; Gopinathan Nair, V; Manikantan Nair, PVariability in nineteen varieties of black gram was studied, under partially shaded conditions in coconut plantations. Analysis of variance for nineteen characters showed significant differences among the varieties for ten characters. Analysis of variance for chlorophyll pigments (a and b) at flowering and pod maturity revealed that there was no significant difference in the chlorophyll content among the varieties, but significant differences existed among the varieties for the chlorophyll pigments estimated at flowering and pod maturity periods. High genotypic coefficient of variation, moderate to high heritability and high genetic advance recorded for leaf area index at 50 per cent flowering and accumulation of dry matter (photosynthetic efficiency) at 50 per cent and 100 per cent flowering, number of days to blooming and number of days to the first pod harvest suggest the reliability of these characters during selection programmes for the improvement of this crop.Item Gujarath cowpea 2 (Chharodi 1) - an ideal cowpea variety for intercropping in coconut garden(Kerala Agricultural University, 1993) Sreekumar, S G; Gopinathan Nair, V; Balakrishnan Asan, RComparative yield trials were conducted with nine varieties of cowpea for three years during kharif in the interspaces of coconut garden at the Instructional Farm, Vellayani. Based on the comparative yield trials' result, Gujaralh Cowpea 2 (Chharodi 1) variety of cowpea was selected and advanced to farm trial at seven locations in Thiruvananlhapu ram district during kharif 1989 along with C 152 and local variety. The variety Gujarath Cowpea 2 (Chharodi 1), which recorded a highest grain yield in farm trials was recommended for cultivation in the interspaces of coconut garden in Thiruvananlhapuram district during kharif.Item Genetic variability and correlations in sugarcane hybrid clones(Kerala Agricultural University, 1993) Alice Antony; Manikantan Nair, P; Gopinathan Nair, VA field trial with selected sugarcane hybrid clones of the intervarietal cross Co 775 x Co 453 was conducted at the Sugarcane Research Station, Thiruvalla to study the different genetic parameters in the settling progeny. High heritability was observed for shoot count, total weight of cane, number of miIIable canes, length of internode, length and girth of cane and weight of single cane at harvest. Cane yield and its components displayed low coefficients of variation. Correlation studies indicated that cane yield has positive correlation with all majoreconomicaltributes except U.K. Brix. The closest association of cane yield with number of millablc canes at harvest was well established with the present study. The study suggested that probabilities of varieties combining higher yield and quality attributes are remote.