Browsing by Author "Ramachandran Nair, N"
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ArticleItem Open Access Breaking seed dormancy in pottavaga (Albyzzia Stipulata, Boivin)(Kerala Agricultural University, 1978) Gopinathan Nair, N; Ramachandran Nair, N; Sreekumar, S G; KAUArticleItem Open Access Effect of ethrel (2 chloro-ethyl phosphonic acid) on growth and yield of bhendi (Abelmoschus Esculentus L Moench)(Kerala Agricultural University, 1979) Sreekumar, S G; Ramachandran Nair, N; Jayachandran, B K; Mary K George; KAUArticleItem Open Access Gamma ray induced viable mutations in sesamum(Kerala Agricultural University, 1978) Ramachandran Nair, N; Gopinathan Nair, VThesisItem Open Access Genetic analysis of productivity parameters in horsegram(Department of Plant Breeding, College of Agriculture,Vellayani, 1991) Elizabeth, Mathew; Ramachandran Nair, NA study on the parameters of variability, correlation and path coefficient were undertaken in forty eight horsegram varieties. The study was conducted at the Department of Plant Breeding, College of Agriculture, Vellayani during Rabi 1989. The varieties showed significant differences in all the characters studied. Genotypic coefficient of variation was maximum for days to flowering and minimum for length of pod. High heritability estimates were observed for hundred seed weight and days to flowering. Genetic gain was maximum for days to flowering. Hundred seed weight and days to flowering recorded high heritability and high genetic gain indicating the presence of additive gene action. At the genotypic level seed yield showed high positive correlation with harvest index and number of pods per plant. Path coefficient analysis projected number of pods per plant, length of pod and number of branches as the traits exerting high positive direct effect on seed yield. The study indicated that the model for plant selection in horsegram should be one with more number of branches, long pods and more number of pods per plant. The varieties P. Palayam, CODB-1, Calicut local, PLS-6056 and No.447 were found to fit in this model.ArticleItem Open Access Makaram and Kumbham - Two improved rice varieties for the Cherady tracts of Kerala(Kerala Agricultural University, Vellanikara, 2003) Sverup John; Mohanakumaran, P D; Vijayagopal, N; Kunjamma P Mathew; Vasanthakumar, K; Ramachandran Nair, N; Alexander, D; KAUArticleItem Open Access Mutagenic efficiency of gamma rays in sesamum(Kerala Agricultural University, 1977) Ramachandran Nair, N; Gopinathan Nair, V; KAUSeeds of sesamum Cv. Kayamkulam-l were irradiated with gamma rays at doses 5 to 30 krad. The effects of irradiation in the M and M, generations were studied. The doses employed had no effect on germination, seedling emergence and plant height in the M, generation. With increase in the dose there was a steady decrease in survival and pollen fertility. The frequency of chlorophyll mutation estimated on M, plant basis was higher than the estimate on !V plant basis The mutation spectrum included xantha (yellow) and chlorina (yellow green). Segregation ratio was maximum at 10 krad and minimum at 25 krad. Mutagenic effectiveness and efficiency were high at the lower doses and decreased with increasing doses. These observations indicate that gamma rays at low fo medium doses can be successfully employed for inducing mutations in sesamum.ThesisItem Open Access Potential for drought tolerance in blackgram (Vigna Mungo L. Hepper)(Department of Plant Breeding, College of Agriculture, Vellayani, 1989) Sudha Rani, S; KAU; Ramachandran Nair, NAn investigation was carried out in the Department of Plant Breeding, College of Agriculture, Vellayani to evaluate the drought tolerance potential of twenty genotypes of blackgram under moisture stress situation. The variability present in the population was studied and a selection index was worked out to identify desirable genotypes from undesirable ones. The varieties were evaluated for yield, yield components and other drought tolerant parameters in a field trial in Randomised Block Design with three replications. The varieties tested showed significant difference for most of the drought tolerant parameters. Genotypic coefficient of variation was maximum for free proline content of leaves and minimum for days to first flowering. Days to maturity, grain-filling period and hundred seed weight exhibited high heritability indicating lesser environmental influence on these characters. Moderate to high heritability and appreciable genetic advance was recorded by leaf area, root/shoot ratio and free proline content of leaves. The correlation study has revealed that leaf area, free proline content of leaves, root spread, number of pods per plant, number of grains per pod, hundred seed weight and grain size showed positive correlation with grain yield. Days to first flowering, days to maturity and grain-filling period were found to be negatively correlated with grain yield. A selection index based on yield, yield components and drought tolerant parameters like leaf area, grain- filling period, root/shoot ratio and free proline content of leaves was found to be relatively more efficient than direct selection for yield. Based on index values, five genotypes were found to be drought tolerant. It can be concluded from the present study that an ideal plant type in blackgram for drought prone area should have early maturity, moderate leaf area, fewer number of stomata, short to medium grain-filling period, high root length and spread and moderate number of pods having maximum grain number and size.ArticleItem Open Access Seed germination in palmarosa (Cymbopogan martini Staff var. Mopia)(Kerala Agricultural University, 1981) Ramachandran Nair, N; Gopinathan Nair, N; KAU