Browsing by Author "Naresh Kumar, S."

Now showing 1 - 20 of 65
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    Adaptive mechanism of coconut palms in the changing environment conditions for higher production
    (2007-02-08) Rajagopal, V.; Kasturi Bai, K.V.; Naresh Kumar, S.
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    Biotechnology and abiotic stress tolerance in plants
    (2007-02-08) Naresh Kumar, S.
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    Carbon Sequestration in Plantation Crops
    (2017) Hebbar, K.B; Balasimha, D.; Naresh Kumar, S.
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    Characteristics of coconut oil blended with sunflower oil and mustard oil
    (2009) Madhavan, K.; Naresh Kumar, S.; Mathew, A.C.; John George
    The studies suggested that balanced oil can be formed by suitably blending CNO with other PUFA or MUFA oils so that it can contain all essential components required for the human health.
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    Characteristics of coconut oil blended with sunflower oil and mustard oil
    (2009) Madhavan, K.; Naresh Kumar, S.; Mathew, A.C.; John George
    The studies suggested that balanced oil can be formed by suitably blending CNO with other PUFA or MUFA oils so that it can contain all essential components required for the human health.
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    Chlorophyll flourescence transients with response to leaf water status in coconut
    (2006-12) Kasturi Bai, K.V.; Rajagopal, V.; Naresh Kumar, S.
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    Climate change and coconut plantations in India: Impacts and potential adaptation gains
    (2013) Naresh Kumar, S.; Aggarwal, P.K.
    The assessment of impact of climate change on coconut, a plantation crop, is challenging. However, the development of a simulation model (InfoCrop-COCONUT) has enabled the process. We present the first simulation analysis of the potential impacts of climate change on coconut productivity in India following two approaches, namely: (i) ‘fixed increase in temperature and CO2, and (ii) scenarios as per PRECIS (Providing Regional Climates for Impact Studies) – a regional climate model. Impact of changed management on coconut productivity in current as well as in future climates is also assessed. Climate change is projected to increase coconut productivity in western coastal region, Kerala, parts of Tamil Nadu, Karnataka and Maharashtra (provided current level of water and management is made available in future climates as well) and also in North-Eastern states, islands of Andaman and Nicobar and Lakshadweep while negative impacts are projected for Andhra Pradesh, Orissa, West Bengal, Gujarat and parts of Karnataka and Tamil Nadu. On all India basis, even with current management, climate change is projected to increase coconut productivity by 4.3% in A1B 2030, 1.9% in A1B 2080, 6.8% in A2 2080 and 5.7% in B2 2080 scenarios of PRECIS over mean productivity of 2000–2005 period. Agronomic adaptations like soil moisture conservation, summer irrigation, drip irrigation, and fertilizer application cannot only minimize losses in majority of coconut growing regions, but also improve productivity substantially. Further, genetic adaptation measures like growing improved local Tall cultivars and hybrids under improved crop management is needed for long-term adaptation of plantation to climate change, particularly in regions that are projected to be negatively impacted by climate change. Such strategy can increase the productivity by about 33% in 2030, and by 25–32% in 2080 climate scenarios. In fact, productivity can be improved by 20% to almost double if all plantations in India are provided with above mentioned management even in current climates. In places where positive impacts are projected, current poor management may become a limiting factor in reaping the benefits of CO2 fertilization, while in negatively affected regions adaptation strategies can reduce the impacts. Thus, intensive genetic and agronomic adaptation to climate change can substantially benefit the coconut production in India.
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    Climate Change, Carbon Sequestration, and Coconut-Based Ecosystems
    (2018) Ramachandran Nair, P.K.; Mohan Kumar, B.; Naresh Kumar, S.
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    Coconut
    (Naya Udyog, Kolkata., 2006-01) Rajagopal, V.; Parthasarathy, V.A.; Naresh Kumar, S.; Reddy, D.V.S.; Rohini Iyer
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    Coconut
    (2017) Naresh Kumar, S.; John Sunoj, V; Muralikrishna, K.S; Hebbar, K.B; Rajagopal, V; Kasturi Bai, K.V.; Chowdappa, P
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    Coconut community in India -a profile
    (CPCRI, 2001-09) Arulraj, S.; Rajagopal, V.; Sairam, C.V.; Thamban, C.; Anithakumari, P.; Dhanapal, R.; Bosco, S.J.D.; Subaharan, K.; Naresh Kumar, S.; George V. Thomas; Vinayaka Hegde; Kumaran, P.M.; Parthasarathy, V.A.
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    Criteria for identification of coconut palms in situ tolerant to abiotic stresses in farmers fields
    (2006-10) Naresh Kumar, S.; Rajagopal, V.; Kasturi Bai, K.V.
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    Day time fluctuations in photosynthetic parameters and water relations in juvenile coconut palms grown under rainfed and irrigated conditions
    (2007-02-08) Rajagopal, V.; Naresh Kumar, S.; Kasturi Bai, K.V.; Laxman, R.H.
    Day time (7 h to 18 h) fluctuations in photosynthetic parameters (net photosynthetic rate, Pn; stomatal conductance, gs; internal CO2 concentration, Ci); water relations (leaflet water potential, Yiear; transpiration rate, E) and weather parameters (photosynthetically active radiation, PAR; leaflet temperature, Tleaff; air vapor pressure deficit, VPD) were estimated in juvenile palms of coconut grown under rainfed and irrigated conditions. Variations in values and day time fluctuations in photosynthetic parameters and water relations were observed between palms grown under rainfed and irrigated conditions, Pn, E and gs were maximum between 09:00 and 11:30 and 15:00 and 16:00 h. Ci and ψie,r were least during mid-day. Mid-day slump in Pn and gs was observed. Tleaf, PAR and VPD were maximum between 09:00 and 16:00 h. E and VPD were positively correlated. Rainfed palms had higher Tleaf, Ci, CilCa and leaf to ambient temperature difference (∆T) and lower Pn, ψr and E compared to the irrigated palms. Instantaneous and intrinsic water use efficiency increased under mild water-deficit conditions. It is apparent that under rainfed conditions the carbon assimilation efficiency was low compared to irrigated condition. VPD and Ar influenced gs and water relations during day time which predominantly determined the variations in photosynthetic efficiency of coconut under irrigated and rainfed conditions.
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    Diversified uses of coconut cultivars
    (2007-02-08) Naresh Kumar, S.; Rajagopal, V.
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    DNA polymorphism among coconut (Cocos nucifera L.) cultivars and reciprocal cross derivatives differing in drought tolerance
    (2004-12) Manimekalai, R.; Nagarajan, P.; Bharathi, M.; Naresh Kumar, S.
    Coconut seedlings of Laccadive Ordinary Tall (LCT). Gangabondam Green Dwarf (GBGD) and their reciprocal cross combinations were analysed by molecular markers viz. Random Amplified Polymorphic DNA (RAPD) and Inter Simple Sequence Repeats (ISSR). These seedlings were evaluated for water stress tolerance based on leaf water potential measured during stress and non- stress periods. Thc leaf water potential decreased during stress period. The differences among the individuals for leaf water poteniial during stress were not significant. The molecular markers revealed the genetic structure of the cultivars and derivatives clearly. In the dendrogram. individuals of GBGD and GBGD X LCT formed one cluster and LCT and LCT X GBGD formed another cluster. The individuals of LCT and LCT X GBGD showed variation among themselves and they were scattered in the principal co-ordinate plot. Even though the parents are same. the reciprocal cross derivatives behaved differently for leaf water potential and showed polymorphism at DNA level. When the dwarf palm was used as female parent, the F, s were similar to female parent in their banding pattern.
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    Drought management in coconut garden through soil moisture conversion
    (2007-01) Naresh Kumar, S.; Rajagopal, V.
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    Drought management in plantation crops
    (2007-02-08) Rajagopal, V.; Kasturi Bai, K.V.; Naresh Kumar, S.
    Drought is major constraint for crop producing in plantation crops under rainfed conditions. in coconut soil water plant relationships have been worked out. In sandy loam soil, water deficit of 110 mm is the critical level at which coconut suffered most due to moisture stress. The drought tolerant characters has been identified by screening the germplasm for specific traits sensitive to stress conditions. The sensitive critical stages to drought stress has been identified in Coconut and Arecanut. The strategies for drought management like conservation of available soil moisture and efficient use of available water resources for higher productivity have been discussed in detail. Development of molecular makers; for such desirable drought tolerant traits is one of the future goals, so as to transfer it into promising genotypes.
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