Browsing by Author "Nayar, N K"

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Dryback - a successful method to prolong the storage period of sprouted seeds in rice
(Kerala Agricultural University, Vellanikara, 2001) Leena Kumary, S; Nayar, N K
Effect of artificial induction of flowering in pineapple
(Kerala Agricultural University, 1980) Balakrishnan, S; Nayar, N K; Valsamma Mathew
A study was undertaken at the Pineapple Research Centre, Vellanikkara during 1976—78 ye^irs to 3Ssess the influence of growth regulator 100 ppm ethrel solution containing 2% urea and 0,04# calciu.n carbonate in inducing flowering of pineapple plants raised from suckers and crowns. The crowns were not found to be as vigorous as suckers in growth chaiacteristics. Crowns the age group 17 to 20 months can be induced to flower earlier and uniformly. For getting better fruit weight, it is preferable to apply growth regulator on 20 month old crowns.
Effect of size of suckers on growth and yield in pineapple (Ananas Comosus. Merr.) cv. Kew
(Kerala Agricultural University, 1981) Balakrishnan, S; Nayar, N K; Valsamma Mathew
Studies carried out at the Pineapple Research Centre, Kerala Agricultural University, Vellanikkara during 1976-78 on the effect of different sizes of suckers on growth and yield in pineapple variety 'Kew' revealed that the productivity of the crop is not influenced by the size of suckers used for planting.
Effect of weight of suckers of nendran banana on plant growth and yield
(Kerala Agricultural University, 1978) Nayar, N K; Balakrishnan, S; Shilaja, S
Frequency and spectrum of gamma ray induced variations in the weight of ears in rice variety jaya
(Kerala Agricultural University, 1978) Nayar, N K; Ninan, C A
The relative magnitude of induced variability in the weight of ear was assessed after treating dry seeds of rice variety jaya with 10, 20 and 30 kR exposures of gamma rays. The treated population showed a significant reduction in mean value both in M, and M:: without any significant differences between the seven M, panicle categories. Studies on the phenotypic frequency distribution of the mutants in M, and M8 showed bidirectional shift compared to control. The analysis of variance showed significant variation both in M, and M9 for negative mutation frequency. Both in negative and positive mutation frequencies there were no significant differences among the seven M, panicle categories. As there is a reduction in segregation values in later generations it is better to have selection for desirable mutants in M, than in M.2. The higher values both in genetic advance and heritability observed in this study suggest that improvement through gamma ray irradiation is possible in this particular character.
Gamma rav induced variations in fruit quality of banana [Musa (Aab) Nendran]
(Kerala Agricultural University, 1996) Radha Devi, D S; Nayar, N K
Gamma ray induced variation for yield in sweet potato
(Kerala Agricultural University, 1995) Suma Bai, D I; Nayar, N K
Genetic variability in brinjal germplasm
(Kerala Agricultural University, 1984) Gopimony, R; Nayar, N K; Mary K George
Genetic variability was worked out for 12 characters in brinjal germplasm of 27 varieties. Days to flower recorded ths lowest PCV and GCV indicating little scope for improvement for those characters. Percentage of fruit set showed the lowest heritability indicating a high degree of nonheritability variability. An association of high heritability and genetic advance was shown by single fruit weight, total fruit yield and equatorial diameter of fruit indicating additive gene effects.
Hardening and ex vitro establishment of rose plantlets
(Kerala Agricultural University, 1997) Wilson; Nayar, N K; Sivaprasad, P
Plantlets regenerated by in \ilro techniques under high humidity and low temperature in an artificial medium did not survive by direct planting out in small pots. An improvised structure made of wooden frame and polyethylene cover helped to maintain high humidity to ex vitro plantlets. Attempts made to get successful field establishment with different potting media and nutrient solutions did not give any positive results. Successful hardening and ex vitro establishment of plantlets were achieved by surface inoculation of different species of vesicular arbuscular mycorrhizae {VAM). Inoculation with Glomus etunicatum (Becker and Gerd) recorded the highest survival rate of 66.67 per cent, and took minimum days for flowering.
In vitro propagation of Rose cv. Folklore
(Kerala Agricultural University, 1998) Wilson; Nayar, N K
Surface sterilisation, stage of explant, media for culture establishment and multiple shoot induction were standardised for in vitro propagation of rose cv. Folklore. Treatment with mercuric chloride 0.08% for 12 min was found to be optimum for the surface sterilisation of axillary bud explants. Axillary buds excised four days after flower opening, having 1.0 cm length, exhibited the best response in culture establishment. The Murashige and Skoog (MS) basal medium supplemented with benzyl aminopurine (BAP) 2.5 mg I 1 + 2.4 dichlorophenoxy acetic acid (2,4-D) 0.5 mg 1' was found to be the suitable medium for culture establishment. The best combination for multiple shoot induction was MS basal medium supplemented with kinetin 2.0 mg 1' + gibberellic acid (GA,) 1.0 mg 1'.
Path analysis in guinea grass (Panicum maximum jacq.)
(Kerala Agricultural University, 1986) Sreenivasan, E; Kamalam, N; Nayar, N K
Twenty four diverse genotypes of guinea grass were assessed to test the path coefficient relation to fix the characters having maximum influence on fodder yield. Path analysis revealed that the maximum direct contribution to fodder yield was through plant height followed by girth of internode. Number of days to 50 per cent flowering, girth of internode and length of panicle also showed indirect contributions towards higher yield. It was also clear from the present investigation that a positive selection can be achieved based on plant height and culm thickness »B tfas fodder crop.
Studies on crop population density in pineaopple var. kew (Ananas comosus Merr)
(Kerala Agricultural University, 1981) Balakrishnan, S; Nayar, N K; Valsamma Mathew; Gopalakrishnan, T R