Browsing by Author "Srinivasulu, B."
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Item Coconut variety Kalpa Pratibha(2009-05) Niral, V.; Augustine Jerard, B.; Samsudeen, K.; Arunachalam, V.; Kumaran, P.M.; Ratnambal, M.J.; Rao, E.V.V.B.; Pillai, R.V.; Satyabalan, K.; Nampoothiri, K.U.K.; Nair, M.K.; Bavappa, K.V.A.; Nair, R.V.; George V. Thomas; Reddy, V.S.K.; Goutham, B.; Kalpana, M.; Raghava Rao, D.V.; Nageswarao, M.B.; Srinivasulu, B.; Vaithilingam, R.; Natarajan, C.; Kumar, M.; Meenakshi Ganesan, N.; Nagwekar, D.D.; Arulraj, S.;Item Evaluation of Certain Coconut Crosses for Heterosis(2002) Rao, D.V.R.; Hameed Khan, H.; Srinivasulu, B.; Rao, N.B.V.C.; Kalpana, M.The extent of heterotic effects in coconut crosses involving different parent combinations of 16 crossess and 7 characters was studied. The studies revealed the prevalence of wide range of variability and heterosis in the coconut crosses. The level of heterosis with respect to different characters in the crosses studied and its. significance in the coconut breeding programme are discussed in this paper.Item Identification and Characterization of in Situ Drought Tolerant Palms in Farmers Fields in Different Agro-Climatic Zones(2002) Naresh Kumar, S.; Rajagopal, V.; Siju Thomas, T.; Vinu K. Cherian; Hanumathappa, M.; Anil Kumar; Srinivasulu, B.; Nagvekar, D.Coconut palms are mainly grown as rainfed crop, and are exposed to drought of different intensities and durations in various parts of the country. It is important to identify and conserve the ecotypes, which could withstand the vagaries of nature and still performed better in terms of growth and yield. Such efforts will ensure that the natural genetic variability and desirable traits are identified and conserved for further exploitation. With this in view present survey was undertaken in farmers fields at different agro-climatic zones, viz., Western coastal area - hot sub-humid-per-humid (Ratnagiri - Maharastra), hot semi arid (Arisikere - Karnataka) and Eastern coastal plains- hot sub-humid (Ambajipeta- Andhra Pradesh), which represent the major coconut growing areas in India. These places faced periodical durought during last 15 years and the dry spell was longer in Ratnagiri (216 days) and Arsikere (202 days). During survey drought affected and apparently tolerant palms were selected based on morphology. The data indicate that in situ drought tolerant palms had more number of leaves, bunch and mature nuts compared to the affected palms. Gas exchange characters were also high in apparently tolerant palms. These palms also exhibited good water use efficiency. However, the biochemical composition did not show any definite trend between tolerant and susceptible types. The superiority of these palms in the photosynthetic parameters showed their capacity for drought tolerance and high yield. The tolerant palms can be used as mother palms in breeding programme for drought tolerance.Item Integrated disease management of basal stem rot in coconut(2007-06) Srinivasulu, B.; Vijaya Krishna Kumar, K.; Aruna, K.; Rao, D.V.R.Item Performance of coconut based cropping systems for sustainable productivity under Coastal Ecosystem of Andhra Pradesh(2004-12) Rao, D.V.R.; Kalpana, M.; Srinivasulu, B.; Khan, H.H.Two coconut based multispecies cropping systems consisting of Model-I (Coconut + Cinnamon + Pepper + Cocoa + Banana + Pineapple + E.F.Yam + Colocasia + Turmeric) and Model-II (Coconut + Pepper + Banana + Pineapple + E.F.Yam + colocasia + Turmeric) were evaluated comparing with coconut monocropping system (Model-III) for coconut yield, nut quality and sustained productivity and economic viability for four consecutive years (1999-2003) at ARS, Ambajipeta. Data on mean nut yield/palm/year revealed that the highest yields were registered by the palms of Model-I (102.7 nut/palm/ year) followed by Model-II (96.47 nut/palm/year) compared to only 7 1.14 nut/palm/year in Model-III (monocropping) accounting for an yield increase of 35.60 to 44.36 per cent. Data on annual nut yield exhibited a gradual increase year after year from 1999- 2000 up to 2002-03 indicating the sustainability of the cropping system. The nut yield increased, by 27.04 per cent in Model-I and 18.47 per cent in Model-II compared to only 3.63 per cent in Model-III prior to the experimental values. The economic analysis and employment generation studies revealed that the maximum returns and maximum number of mandays/ha/year were obtained from Model-I (Rs.47,589 and 680 mandays) followed by Model-II (Rs. 39,496 and 569 mandays) with Model-III putting up the lowest returns and mandays (Rs. 9,477 and 166 mandays). Considering the monetary returns and sustainability of the coconut yields, cropping system Model-I followed by Model-II were found suitable and these models may be recommended to the coastal ecosystem of AP.Item Prevalence of Basal Stem Rot Disease of Coconut in Coastal Agro-Ecosystem of Andhra Pradesh(2002-11) Srinivasulu, B.; Aruna, K.; Krishna Prasadji; Rajamannar, M.; Sabitha Doraisamy; Rao, D.V.R.; Khan, H.H.Item Transmission electron microscopy confirms pytoplasmal etiology of Tatipaka disease of coconut(2006) Srinivasulu, B.; Nagamalleswari Devi, Y.; Vijay Krishna Kumar, K.; Aruna, K.; Krishna Prasadji, J.; Rao, D.V.R.Item Trichoderma Hamatum - A Potential Biocontrol Agent For Basal Stem Rot (Ganoderma Wilt) Disease Of Coconut(2002) Srinivasulu, B.; Aruna, K.; Lakshmi, K.M.; Sabitha Doraisamy; Rao, D.V.R.; Hameed Khan, H.Basal stem rot (Ganodenna wilt) disease caused by Ganoderma spp is one of the major constraints in coconut cultivation, especially in light soils of Andhra Pradesh. Native bio control agents, Trichodenna spp were isolated and were identified as T.viride, T.harzianum and T.hamabim. The compatibility of commonly used agrochemicals with native bioagents and test pathogen was determined. Talc formulations for the three spp of Tnchoderma were developed. Neem cake, wheat grains and farmyard manure were found to be superior over other substrates for mass multiplication as indicated by maximum growth and sporulation of these bio agents. ZnSO, (296) was found inhibitory to Ganoderma spp but not to T.viride, T.hamatum and T.harzianum (1% ZnSO,). Field studies indicate that the talc formulations (50 glpalm) of T.hamatrrm alone and in combination with 5 kg neem cake potentially arrested the spread of the disease (0 to 3%) followed by T.harzianum and T.viride when fortified in neem cake 8 5 kg per palm.Item Variations in nut yield of coconut and dry spell in different agro-climatic zones of lndia(2007-09) Naresh Kumar, S.; Rajagopal, V.; Siju Thomas, T.; Vinu K. Cherian; Ratheesh Narayanan, M.K.; Ananda, K.S.; Nagawekar, D.D.; Hanumanthappa, M.; Vincent, S.; Srinivasulu, B.Coconut is the major perennial crop in coastal areas of lndia. It is mainly grown under rainfed conditions in areas of high rainfall. However, these plantations face summer drought situations as the rainfall distribution is restricted to only 4 to 5 months a year, leaving remaining period as dry. The objective of the study is to quantify the dry spell and to deduce the influence of rainfall and dry spell on the nut yield in major coconut growing areas situated in different agro-climatic zones of India. viz., western coastal area - hot sub-humid per-humid (represented by Kasaragod in Kerala and Ratnagiri in Maharashtra), Western Ghats - hot sub-humid per-humid (represented by Kidu in Karnataka); hot semi-arid (represented by Arsikere in Karnataka); and eastern coastal plains - hot subhumid (represented by Veppankulam in Tamil Nadu and Ambajipeta in Andhra Pradesh). Variation in annual rainfall was from a maximum of 3337.7 mm (Kasaragod) to a minimum of 718.23 mm (Arsikere). Dry spell was longer in Ratnagiri (216 days) and Arsikere (202 days), and shorter at Kidu (146 days). The annual nut yield under rainfed conditions varied from 68 (Ambajipeta) and 66 (Kasaragod) to 41 (Arisekere) and 30 (Kidu). Impact of variations in dry spell on nut yield was discernible from the study. In view of the long duration (44 months) between the inflorescence initiation to nut maturation, the occurrence of dry spell in any one year would affect the yield for the subsequent three to four years. It can be inferred that the longer dry spell affects the nut yield for next four years to follow with stronger impact on fourth year, irrespective of the total rainfall.