Browsing by Author "Karunakaran, K"
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Item Chemical control of the rice leaf roller Cnaphalocrocis Medinalis Guen(Kerala Agricultural University, 1977) Thomas, B; Karunakaran, KA field trial was conducted in the Rice Research Station, Pattambi for four consecutive seasons in 1974-75 and 1975-76 with a view to study the relative efficiency of ten insecticides against the Rice Leaf roller Cnaphalocrocis medinahs. Leptophos, monocrotophos, ethyl parathion, quinalphos and dicrotophos applied at 0.25 kg a.i/ha and carbaryl applied at 0.5 kg a.i/ha were highly effective in checking the pest incidence.Item Chlorophyll mutation yields of earlier and later tillers in rice(Kerala Agricultural University, 1977) Karunakaran, K; Varkey, P AItem Effect of planting seasons and the associated weather conditions on the incidence of the rice stem borer Tryporyza incertulas (Walker)(Kerala Agricultural University, 1972) Abraham, C C; Thomas, B; Karunakaran, K; Gopalakrishnan, RItem Expression of heterosis in some inter-varietal hybrids of oryza sativa linn(Kerala Agricultural University, Vellanikara, 1968) Karunakaran, KItem Note on stomatal studies in some rice varieties-Letters to the editor(Kerala Agricultural University, Vellanikara, 1966) Karunakaran, KItem On the need and feasibility of identifying rice varieties giving high yields at lower levels of NPK(Kerala Agricultural University, 1978) Karunakaran, KItem Pachytene analysis in two varieties of Oryza sativa L.(Kerala Agricultural University, Vellanikara, 1967) Karunakaran, KItem Performance of the rice varieties satya, soorya and suhasini in Kerala(Kerala Agricultural University, 1977) Karunakaran, K; Gopalakrishnan, RItem PTB 47, a promising flood tolerant rice variety(Kerala Agricultural University, 1993) Rosamma, C A; Karunakaran, K; Rajappan Nair, NIn order to identify a high yielding variety suited to the flood prone areas, a total of 405 entries were screened for their flood tolerance. Selected entries were yield tested for three seasons and finally BR 51-315-4, a semi-tall nonlodging variety with reasonably high grain as well as straw yield was identified as the ideal variety for these areas. Performance of this variety was highly promising in the multilocational farmers field trials also and this high yielding variety is capable of replacing all the traditional rice varieties in flood prone areas.Item Red triveni, a promising rice variety(Kerala Agricultural University, 1993) Rosamma, C A; Karunakaran, K; Rajappan Nair, NReselection has been effectively utilised as a breeding programme for defect elimination by many workers and a successful programme in this direction is discussed in this paper. Reselection was attempted in the variety Triveni in order to overcome the drawback of sprouting of grains on the panicle itself under high moisture conditions. While attempting for reselection, red riced plants which might have evolved through natural mutation were identified. Red riced plants wilh dormancy were selected after progeny testing and the new line was designated as Red Triveni. Red Triveni exhibited dormancy fora period of 15 to 20 days. Performance of this culture was highly promising in all the station trials and adaptive trials and was released as Ptb 45.Item Relative efficiency of some plant products in controlling infestation by the Angoumois grain moth Sitotroga cerealella Olivier (Gelechiidae: Lepidoptera) infesting stored paddy in Kerala(Kerala Agricultural University, 1972) Abraham, C C; Thomas, B; Karunakaran, K; Gopalakrishnan, RItem Research notes on anthocyanin pigmentation in certain intervarietal hybrids of Oryza sativa Linn.(Kerala Agricultural University, Vellanikara, 1969) Karunakaran, KItem Studies in some varieties and inter-racial hybrids of Oryza sativa Linn.(Faculty of Cytogenetics and Plant Breeding, Agricultural College and Research Institute, Coimbatore, 1964) Karunakaran, K; Ponnaiya, B W XThe evolution in the concept of geographical rices in Oryza sativa L. The nature and extent of sterility in inter-varietal hybrids and the different explanations for the same, heterosis and its utilization of rice breeding, and pachytene analysis as amethod of karyotypic studies in the genus Oryza with special reference to the intervarietal karyotypic diversity in O.sativa have been briefly reviewed.