2. Institutional Publications
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Item Effect of growth regulators on the yield of tomatoes(Kerala Agricultural University, 1974) Manikantan Nair, P; Mohanakumaran, N; Ramachandran Nair, VItem Study of varietal performance of soya beans(Kerala Agricultural University, 1975) Mary K George; Chandramony, D; Manikantan Nair, PItem Cytological studies on four inter varietal crosses of capsicum annuum(Kerala Agricultural University, 1975) Manikantan Nair, P; Mary K GeorgeCytological studies of microsporocytes in four hybrids and five parents of the varieties of Capsicum annuum were conducted. Variety local blue was taken as the seed parent. The pollen parents Included varieties, Russian, Indian long red, Chinese g-'ant and Oskosh. All the four crosses revealed pronounced heterosis as regards pollea size. Further, all the hybrids manifested the presence of ring quadrivalents, chain quadrivalents, and trivalents while the hybrid local blue x Indian long red contained univalents, pycnotic behaviour, unequal distribution and anaphase bridges. The abnormal meiotic behaviour of microsporocytes had a positive correlation on the pollen sterility and affected the ultimate fruit set.Item Performance of cowpea varieties under varying levels of phosphorus in red-loam soils(Kerala Agricultural University, 1976) Mohamed Kunju, U; Ramachandran Nair, V; Manikantan Nair, P; Sadanandan, NItem Heterosis in chilli (Capsicum annum L.)(Kerala Agricultural University, 1986) Manikantan Nair, P; Mary K George; Mohanakumaran, NAn experiment was laid out in 1979 at the Department of Agricultural Botany, College of Agriculture, Vellayani to study the heterosis in Capsicum annum L. Nine parents and 36 F1 hybrids were compared. Eighteen economic attributes including vitamin A, vitamin C, capsaicin and oleoresin content were studied. All the characters under investigation manifested heterosis over midparental values though there was wide variation for different traits in different cross combinations. Maximum heterosis was noticed for number of primary bradches and vitamin C content. A comparison of average heterosis for various characters revealed that number of secondary branches topped the list followed by vitamin C, capsaicin content and number of primary branches. The studies identified two promising hybrids with desirable attributes namely Purple Round x Vellanotchi and Pant C1 x Purple Cluster. Negative heterosis was noticed for two important economic attributes namely number of days taken for blooming and number of seeds per fruit. For nutritive and quality characters very little expression of hybrid vigour in vitamin A content was noticed. However, there was considerable manifestation of hybrid vigour in vitamin C and oleoresin content.Item Variability and correlations in sugarcane hybrids for economic attributes(Kerala Agricultural University, 1986) Alice Antony; Manikantan Nair, P; Sukumaran Nair, SItem Heterosis in bhindi(Kerala Agricultural University, 1988) Sheela, M N; Manikantan Nair, P; Gopinathan Nair, VSix parents and their six hybrids were evaluated during 1984-'85 on the basis of percentage of heterosis manifested by them for yield and its components. All the hybrids displayed desirable heterosis for the major economic characters such as weight of fruits per plant, number of fruits per plant etc. Negative heterosis was exhibited by the hybrids for crude fibre content, the most important quality attribute in bhindi. The results suggested that heterosis breeding could be effectively employed in augmenting the yield potential and allied attributes in bhindi. The present study could identify two hybrids Selection 2-2 x Kilichundan and Sevendhari x Kilichundan with high yield potential coupled with other desirable attributes. The hybrids, Selection 2-2 x Kilichundun and Sevendhari x Kilichundan have out yielded the standard cultivar, Pusa Sawani, by 65.06 percent and 50.34 per cent respectively. Both the hybrids produced large number of long heavy fruits with good thickness and low crude fibre content. These hybrids will go a long way in boosting up the production potential of bhindi in homestead and commercial cultivations.Item Genetic evaluation of pre-release cultures and varieties of rice for yield, sheath blight and sheath rot diseases(Kerala Agricultural University, 1992) Sreekumar, S G; Gopinathan Nair, V; Balakrishnan Asan, R; Manikantan Nair, PItem Correlation studies in black gram under partially shaded conditions(Kerala Agricultural University, 1992) Saji T Abraham; Sreekumar, S G; Saraswathy, P; Gopinathan Nair, V; Manikantan Nair, PItem Path analysis for harvest index in black gram(Kerala Agricultural University, 1992) Saji T Abraham; Sreekumar, S G; Saraswathy, P; Gopinathan Nair, V; Manikantan Nair, P