Browsing by Author "Ramadasan, A."

Now showing 1 - 20 of 54
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    Certain leaf anatomical characteristics of two coconut cultivars and hybrids
    (2007-02-08) Ramadasan, A.; Satheesan, K.V.
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    Changes in carbohydrate levels and starch/sugar ratio in three turmeric (Curcuma domestica Val.) cultivars grown in monoculture and as an intercrop in coconut garden
    (2007-02-08) Satheesan, K.V.; Ramadasan, A.
    Seasonal changes in the carbohydrate fractions like starch and total sugars as well as starch/sugar ratio in three turmeric cultivars viz., Cls. No. 24 (C1), CU. 328 Sugandham (C2) and Duggirala (C3) grown in monoculture and as an intercrop in coconut garden were determined. Cultivar Cls. No. 24 showed higher build up of starch in leaves as well as rhizomes when grown as a pure crop than as an intercrop, while for the cultivars Cll. 328 Sugandham and Duggirala this difference between the two cropping systems was not apparent. The stage of maximum rhizome growth rate coincided with a reduction in the starch/sugar ratio in leaves, the reduction being more pronounced in cultivar Cls. No. 24 than in cultivars Cll 328 Sugandham and Duggirala. Such a marked reduction in the starch/sugar ratio in leaves recorded by the cultivar Cls. No. 24 indicated that during rhizome bulking period, this cultivar was more efficient in the transloca-tion of photosynthates than the other two cultivars.
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    Changes in leaf carbohydrates in relation to commencement of flowering in coconut palm
    (1979) Kasturi Bai, K.V.; Ramadasan, A.
    Changes in leaf carbohydrates were monitored in a group of young palms for a duration of three years during which period six of them commenced flowering. The changes in cafbohydrate fractions, as influenced by the environmental factors, in the palms that commenced flower­ing, during the period under study are discussed.
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    Chlorophyll content in certain cultivars and hybrids of coconut
    (2007) Chacko Mathew; Ramadasan, A.
    N/2 or (N+1/2) leaf (where N is the total number of leaves) were determined to be the most representative one for chlorophyll estimations in coconut. Significant differences in the chlorophyll content were noted among the different varieties and hybrids of coconut. The two high yielding hybrids, viz., T x D and D x T, possessed more chlorophyll than West Coast Tall, Dwarf Grange and Dwarf Green. Chlorophyll content was lowest in the Dwarf Orange variety.
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    Chlorophyll content in certain cultivars and hybrids of coconut
    (2007-02-08) Chacko Mathew; Ramadasan, A.
    N/2 or (N+l/2) leaf (where N is the total number of leaves) were determined to be the most representative one for chlorophyll estimations in coconut. Significant differences in the chlorophyll content were noted among the different varieties and hybrids of coconut. The two high yielding hybrids, viz., Tx D and D x T, possessed more chlorophyll than West Coast Tall, Dwarf Orange and Dwarf Green. Chlorophyll content was lowest in the Dwarf Orange variety.
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    Chlorophylls and nitrate reductase activity in relation to heterosis in coconut seedlings
    (1985) Shivashankar, S.; Rajagopal, K.; Ramadasan, A.
    The F1 progeny of Chowghat Dwarf Orange (CDO) and West Coast Tall (WCT) cross tend to be highly heterozygous with respect to the colour of petiole and seedling vigour. The study indicated that the greenish brown coloured vigorous plants had higher chlorophyll (a + b) content and nitrate reductase (NR) activity compared to the orange coloured vigorous plants and the dwarfs. The greenish brown seedlings were also characterized by a larger leaf area and shoot d. wt. The results provide biochemical evidence in support of the morphological criteria being used at present in the selection of hybrid coconut seedlings.
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    Chlorophylls and Nitrate reductase activity in relation to Heterosis in coconut seedlings
    (2007-02-08) Shivashankar, S.; Rajgopal, K.; Ramadasan, A.
    The F1 progeny of Chowghat Dwarf Orange (CDO) and West Coast Tall (WCT) cross tend to be highly heterozygous with respect to the colour of petiole and seedling vigour. The study indicated that the greenish brown coloured vigorous plants had higher chlorophyll (a+b) content and nitrate reductase (NR) activity compared to the orange coloured vigorous plants and the dwarfs. The greenish brown seedlings were also characterized by a larger leaf area and shoot d. wt. The results provide biochemical evidence in support of the morphological criteria being used at present in the selection of hybrid coconut seedlings.
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    Coconut
    (2007-02-08) Ramadasan, A.; Rajagopal, V.
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    Coconut and arecanut based high density multispecies cropping systems
    (2007-02-08) Bavappa, K.V.A.; Kailasam, C.; Khader, K.B.A.; Biddappa, C.C.; Khan, H.H.; Kasthuri Bai, K.V.; Ramadasan, A.; Sundararaju, P.; Bopaiah, B.M.; George V. Thomas; Misra, L.P.; Balasimha, D.; Bhat, N.T.; Shama Bhat, K.
    High density multispecies cropping models were laid out one each in coconut and arecanut plantations during 1983. Data on various aspects of the system behaviour showed that the yield of coconut and arecanut increased to the extent of 176% and 12S% respectively in the two systems. The possibility of getting additional yields due to cropping system approach was, evident. There was no marked yield difference of the crops in the full, two-third and one-third levels of fertilizers applied though depletion in N and Mg balance was indicated. The air space utilisation was 31% in coconut while it was 63% in the arecanut system. The biomass production of the two systems showed that there was substantial increase in coconut biomass while the biomass of other crops remained more or less the same. In general, there was build-up of P and K nutrients in the systems. Under the arecanut system N also showed increased balance. There was improved microbial activity in the systems. No serious pest and disease management problems were indicated due to the high density cropping system approach. A number of crop varieties and hybrids tolerant/resistant to the nematode pathogen could be identified. The interaction of various, factors for exploiting higher levels of productivity through a system approach and the need for predicting crop choices based on data and crop performance are discussed in the paper.
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    Coconut and arecanut based high density multispecies cropping systems
    (1986-12) Bavappa, K.V.A.; Kailasam, C.; Khader, K.B.A.; Biddappa, C.C.; Khan, N.H.; Kasthuri Bai, K.V.; Ramadasan, A.; Sundararaju, P.; Bopaiah, B.M.; George V. Thomas; Misra, L.P.; Balasimha, D.; Bhat, N.T.; Shama Bhat, K.
    High density multispecies cropping models were laid out one each in coconut and arecanut plantations during 1983. Data on various aspects of the system behaviour showed that the yield of coconut and arecanut increased to the extent of 176% and 125% respectively in the two systems. The possibility of getting additional yields due to cropping system approach was evident. There was no marked yield difference of the crops in the full, two-third and one-third levels of fertilizers applied though depletion in N and Mg balance was indicated. The air space utilisation was 31% in coconut while it was 63% in the arecanut system. The biomass production of the two systems showed that there was substantial increase in coconut biomass while the biomass of other crops remained more or less the same. In general, there was build-up of P and K nutrients in the systems. Under the arecanut system N also showed increased .balance. There was improved microbial activity in the systems. No serious pest and disease management problems were indicated due to the high density cropping system approach. A number of crop varieties and hybrids tolerant/resistant to the nematode pathogen could be identified. The interaction of various factors for exploiting higher levels of productivity through a system approach and the need for predicting crop choices based on data and crop performance are discussed in the paper.
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    Comparative study of coconut genotypes for components of photosynthesis and respiration
    (2007-02-08) Shivashankar, S.; Kasturi Bai, K.V.; Ramadasan, A.
    The three coconut genotypes, West Coast Tall (WCT), Chowghat Dwarf Orange (CDO) and the hybrid WCTxCDO (TxD) were com-pared for the rate of apparent photosynthesis, dark respiration, chlorophylls a and b, total carotenoids, relative assimilation rate (RAR), leaf area, and stomatal frequency. With die exception of WCT, the rate of photosynthesis was not correlated with yield, There was significant difference in the rate of photosynthesis between TxD and WCT. CDO exhibited higher dark respiration as compared to WCT and TxD. TxD had significantly higher amounts of total chlorophylls than WCT and CDO. Stomatal frequency was not related with the rate of photosynthesis. The total leaf area of T x D was the highest followed by WCT and CDO. The results indicate that the total leaf area might be an important factor determining productivity.
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    Curcumin and essential oil contents of three turmeric (Curcuma domestica Val.) cultivars grown in monoculture and as intercrop in coconut garden
    (2007-02-08) Satheesan, K.V.; Ramadasan, A.
    The concentration and accumulation of curcumin and essential oil in the rhizomes of three turmeric cultivars grown in monoculture and as intercrop in coconut garden were determined, The maximum concentration of both curcumin and essential oil attained prior to the maturity of the rhizome. The cultivars showed differential response towards the cropping systems in their curcumin and essential oil contents in the rhizome. The change in the accumulation as well as concentration of essential oil was different from those of curcumin as influenced by the cropping systems.
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    Curcumin and essential oil contents of three turmeric (Curcuma domestica Val.) cultivars grown in monoculture and as intercrop in coconut garden
    (1987-06) Satheesan, K.V.; Ramadasan, A.
    The concentration and accumulation of curcumin and essential oil in the rhizomes of three turmeric cultivars grown in monoculture and as intercrop in coconut garden were determined. The maximum concentration of both curcumin and essential oil attained prior to the maturity of the rhizome. The cultivars showed differential response towards :the cropping systems in their curcumin and essential oil contents in the rhizome. The change in the accumulation as well as concentration of essential oil was different from those of curcumin as influenced by the cropping systems.