Thumbnail Image

Theses

Browse

1981 - 19843
Reset filters
Subject: Others × Author: KAU × End date: 1989 × Start date: 1981 ×
Reset filters

Search Results

Now showing 1 - 3 of 3
  • Thumbnail Image
    ThesisItemOpen Access
    Comparative Study of The Contribution of Biometric Characters on Yieldin Dessert and Culinary Varieties of Banana
    (Department of Statistics, College of Veterinary,Mannuthy, 1981) Vijayaraghava Kumar; KAU; George, K C
    Investigations on the different morphological characters were undertaken from the crop raised at the University Banana Research Farm, Kannara. The plants were grown in Randomised blocks of 3 replications. There were 58 varieties in dessert type and 30 in culinary varieties of bananas. The important morphological characters studied were height, girth, number of leaves, weight of hands, weight of fingers, number of fingers, length of fingers, thickness of fingers, number of hands, number of fingers per hand, length of peduncle and the yield. In both of the groups all of these characters were shown high significant difference among varieties. In many characters and in yield the ‘average values’ were slightly greater in culinary varieties. The correlation studies revealed that the phenotypic and genotypic correlations of all these characters with yield is positive. The path coefficient analysis on dessert varieties has shown that the character having maximum contribution to yield is weight of hands. The weight of fingers and number of fingers also influences the yield indirectly. In the case of culinary varieties of bananas the number of fingers had the maximum direct contribution to yield. In this group the conclusion made was that when the number of hands increases, the number of fingers per hand decreases which will bring down the yield. Studies on the discriminant function were also carried out in both the varieties. The genetic advance through discriminant function didn’t reveal any worth significance as the genetic advances through these functions were less than that calculated by straight selection (in both groups). Thus straight selection is enough for such purposes in these banana varieties. By fixing index values for all the varieties in the two groups selection was made easy. The best varieties obtained by this method were Chenkadali and Red Banana in dessert group and Peykunnan and Walha in the culinary varieties. The results from the path analysis has revealed that there is no need of putting any restriction on the dessert varieties. In the other group after putting restriction on ‘girth’ the genetic advance were calculated individually for the significant (the ones taken in this analysis) morphological characters. It has seen that ‘number of fingers’ had the maximum genetic advance. Finally by combining all the varieties in the dessert and culinary groups a combined selection index was also fitted. The genetic advances of this index was found to be nearer to that obtained from the analysis of culinary varieties.
  • Thumbnail Image
    ThesisItemOpen Access
    Compatability among Varieties in Capsicum Annum L. and Frutescens L.
    (Department of Olericulture, College of Horticulture,Vellanikkara, 1984) Krisnakumari, K; KAU; Peter, K V
    Attempts at interspecific hybridization in the genus Capsicum have succeeded only in a few cases. Most of the crosses resulted in negligible seed set and flower fall. Capsicum frutescens is valued for its high pungency and also for the source of resistance to leaf curl and mosaic complex. An experiment was planned and carried out during 1982-83 at the Instructional Farm of the College of Horticulture, Vellanikkara, Trichur to find out crossability and related aspects involving two cultivated varieties of Capsicum annuum (Jwala and K2) and three useful lines of Capsicum frutescens (White Kanthari, Green Chuna and Ornamental Type). All crosses including directs and reciprocals were found to be compatiable except in two combinations where white kanthari was used as the female parent. Relative efficiency of hand pollination, mixed pollination and pollination after NAA (15ppm) spraying on compatibility indicated that the crosses white kanthari x Jwala and white kanthari x K2 failed with hand pollination and pollination after NAA sprying whereas these crosses were successful with mixed pollination. Effect of maternal parent on crossability index and percentage seed set efficiency was found to be significant. The chromosome numbers of the five parental lines were found to be 2n= 24. Significant heterosis was observed for many of the characters. Genetic distance reveals that parents Jwala and Green Chuna were the farthest whereas K2 and ornamental Type were the closest. Maximum oleoresin content was in Jwala (16.83%) and in hybrids Jwala x ornamental Type had the highest (16.6%).
  • Thumbnail Image
    ThesisItemOpen Access
    Standardisation of the Technique of Stonegrafting in Cashew and Management Practices For Field Establishment
    (Department of Pomology, Floriculture and Landscaping, College of Horticulture,Vellanikkara, 1984) Shylaja, M R; KAU; Aravindakhan, M
    The studies on the propagation of cashew by stone – grafting was carried out at the College of Horticulture, Vellanikkara during June, 1982 to May, 1983 to find out the season for stone – grafting, to study the effect of procuring of scions, to standardise the best method of grafting and to find out the proper size, thickness and age of the rootstock on percentage of success of grafting. The studies revealed that the months of August and September were most suitable for stone – grafting under Kerala conditions. The period from October to December was most unsuitable. Of the different treatments tried the treatment TI, where grafting was done by the cleft method using scion sticks defoliated 10 days ahead of the grafting operation was found to be significantly superior to all the other treatments. Defoliation 10 days prior to the grafting operation was definitely superior to five days procuring and non – curing. Similarly the cleft method was found to be better than splice method. There was no significant correlation between the percentage of success and the various weather parameters like quantity of rainfall, number of rainy days, maximum and minimum temperatures and relative humidity. The mist condition did not improve the ultimate take of the grafts. There was linear growth rate for the different growth parameters tested such as the girth of the stock and scion and height of the scion. Also the girth of the stock and scion exhibited the same growth rate giving a ratio of about one for all the treatments except for the treatment T1 (grafting by the cleft method using 10 day procured scions) of the grafts produced in the month of June. There was apparently no difference in the percentage success in stone – grafting prepared from 10 days old and five days old stocks. Stocks and scions of girth 2.1 to 2.4 cm was found to give better success than those of above 2.4 cm. Scions of length 8.6 to 10.5 cm was found to be better than those with a length of 4.5 to 6.5 cm, 6.6 to 8.5 cm and above 10.5 cm.