Browsing by Author "Tessy Joseph"

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Correlation and yield component analysis in greengram (Vigna Radiata L.) in summer rice fallows
(Kerala Agricultural University, 1996) Kanakamany, M T; Gracy Mathew; Leenakumary Tessy Joseph, S; Tessy Joseph
Twelve genotypes of greengram were evaluated during summer 1995 in the rice fallows of tiie Regional Agricultural Research Station, Pattambi. WGG 62 was the highest yielder among the genotypes tested. Out of the ten characters studied the number of pods per plant, per day productivity, chlorophyll ' a' and total chlorophyll contents showed positive and significant association with grain yield. Duration of the crop was found to have no direct relation with yield.
Floral biology and fruit development in varikka and koozha of jack (Artocarpus heterophyllus Lam.)
(Department of Agricultural Botany, College of Horticulture, Vellanikkara, 1983) Tessy Joseph; Kumaran, K
The present investigations were carried out in the Department of Agricultural Botany, College of Horticulture, Vellanikkara during the year 1981-82. The object was to study the pattern of flowering, floral biology, fruit set, fruit drop and fruit development in jack types ‘Varikka’ and ‘Koozha’. The studies were conducted on 14 trees, eight belonging to ‘Varikka’ and six belonging to ‘Koozha’, which were about 50 years old, and maintained under uniform management conditions, located at the Instructional Farm and Research Station, Mannuthy. There was difference in pattern of male and female spike production. The male spike production commenced from October and extended for a period of five months, while female spike production was confined to only three months, starting from late November. The peak time of male and female spike production was in December-January. The inflorescence in jack is a catkin. The process of development of spike took on an average 33.7 days in male and 59.7 days in female. The individual flowers were radially arranged on a fleshy peduncle. The perianth tubes of male flowers were free from each other while that of female were fused in the middle. In a male spike anthesis continued upto 5 to 7 days, on a particular day, anthesis started at 6 am and reached a peak between 12 noon and 4 pm and continued upto 6 pm. The emergence of stigma on a female spike was highly eratic and continued for about three weeks. The peak time for anther dehiscence was between 6 pm and 7 pm, on the day of its emergence. In a female spike complete fading away of stigma occurred in 21 to 30 days after anthesis started. The percentage pollen fertility ranged from 89 to 93 per cent, and mean pollen diameter ranged from 16 to 22 u. 10 per cent sucrose-1 per cent agar media was found to be the best media for pollen germination. The viability of pollen was lost completely within 24 hours after dehiscence. The chief agent of pollination was found to be wind. Fruit set under natural conditions was 83.33 per cent. Hand pollination gave decreased set. Apomictic fruit development was absent in Jack. The percentage fruit drop ranged from 30 to 40 per cent. The whole spike after anthesis developed into a large composite fruit which was a ‘false fruit’, with the persistent perianth forming the bulk of the fruit. Among the flowers on a spike few showed normal development rest got aborted. The time required for full development of fruit ranged from 100 to 138 days, the growth showed a sigmoid pattern. The two types ‘Varikka’ and ‘Koozha’ did not vary significantly for most of the flower and fruit characters except for the texture of flakes; ‘Varikka’ had hard flakes while ‘Koozha’ had softy mushy flakes.
Flowering, floral biology and pollination in hard and soft flaked types of jack (Artocarpus heterophyllus Lam.)
(Kerala Agricultural University, 1996) Tessy Joseph; Kumaran, K
Investigations'on the floral characters of "Varikka' and "Koozha' types of jack (Artocarpus heterophyllus Lam.) were conducted at the Agricultural Research Station, Mannuthy, Trichur on 14 mature trees. There was no significant difference between 'Varikka' and 'Koozha' types in respect of any of the characters studied. The pattern of male and female catkin production was found to differ in jack, the former occurred from October to February while the later was confined to only three months starting from late November to February. In a male catkin, anthesis started by 6 a.m. and continued up to 6 p.m. in a day. This pattern continued for 5 to 7 days in a catkin. Anther dehiscence occurred between 6 p.m. and 7 p.m. on the day of its emergence. The sequence of emergence of stigma on the female catkin was highly erratic and continued for 3 to 4 weeks. Complete fading away of the stigma occurred in 21 to 35 days after anthesis started. The chief agent of pollination was found to be wind although certain amount of insect pollination cannot be ruled out.
Fruit set, fruit development and eruit drop in hard and soft flaked types of jack (Artocarpus heterophyllus Lam.)
(Kerala Agricultural University, 1996) Tessy Joseph; Kumaran, K
Studies on fruit set, fruit drop and fruit development in ' Varikka' and ' Koozha' types of jack (Artocarpus heteropkylhis Lam.) have indicated that the fruit set under natural condition was 83.335?,. The post-set drop ranged from 3040% in the two types studied. The peak period of drop was observed between the 60th and 80th day after emergence of the catkin. The time required for full development of fruit ranged from 100 to 138 days. Growth of fruit showed a sigmoid pattern, the rate being rapid up to the first 80 days and thereafter declined gradually The two types 'Varikka' and 'Koozha' did not vary significantly in any of the above characters.
Genetic analysis of seed dormancy and productivity in groundnut (Arachis hypogaea L.)
(Department of Plant Breeding and Genetics, College of Horticulture, Vellanikkara, 1997) Tessy Joseph; Namboodiri, K M N
Investigations on genetic analysis of seed dormancy and productivity in groundnut (Arachis hypogaea L.) were carried out in the Department of Plant Breeding and Genetics, College of Horticulture, Vellanikkara from 1992-95. The objective of the study was to find out the gene effects of biometric traits and seed dormancy in groundnut, so as to suggest appropriate breeding methodology and parental combinations to evolve domant, high yielding and early manuring varieties. The findings of the study are briefed below. Evaluation of 28 genotypes (14 domant and 14 non domant) for two seasons revealed that wide range of variability existed among them. Donors for specific traits were identified . The genotypes were also genetically diverse and could be grouped into four clusters. The line x tester analysis with three lines and five testers revealed that additive gene effects governed most of the characters except pod yield and number of mature pods , for which , non addictive gene effects were important. To harness both the types of gene effects pedigree method followed by selection in advanced generations will be fruitful.
Intercropping of irrigated banana (Musa aab nendran) with tapioca, groundnut and vegetables
(Kerala Agricultural University, 1995) Prasanna, K P; Kanakamany, M L T; Tessy Joseph; Sasidhar, V K
Morphology of the inflorescence and fruit in jack (Artocarpus Heterophyllus Lam.)
(Kerala Agricultural University, 1995) Tessy Joseph; Kumaran, K
The iiiflorescence in jack is a catkin. The individual flowers are radially arranged on a lleshy peduncle. The perianth tubes of male flowers are free from each other, while those of female (lowers are fused in the middle region. Androecium consisted of a single stamen with a hasifixed four celled anther. Gynoecium consisted of a white waxy clavate stigma, a slender style and a unicelled ovary with a solitary ovule inside, attached by marginal placentation. The female catkin after pollination developed into a large composite fruit (sorosis) which is a 'false fruit', with the persistent perianth forming the hulk of the f r u i t . The 'tnie fruit' resembled an achene. Except for the texture of the flakes after ripening, the two types studied had the same morphological features; the 'koo/.ha' with soft mushy Hakes an 'varikka' with crisp hard flames.