Browsing by Author "Devadas, V S"

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Arka jyothi - a promising watermelon hybrid
(Kerala Agricultural University, 1993) Abdul Vahab, M; Devadas, V S; Peter, K V
Assessment of variability in annona spp.
(Department of Pomology and Floriculture, College of Horticulture, Vellanikkara, 2016) Jyolsna, M; Devadas, V S
Annona spp. is a group of underutilized fruit crops with tremendous potential. Among these, Annona reticulata, A. squamosa, and A. muricata are seen as a homestead crop in Kerala. Since Annona spp. is cross pollinated as well as a seed propagated fruit crop, there exists wide variability indicating scope for selection of promising types. In a purposive sample survey, 71 trees comprising of 30 trees of Annona reticulata, 16 trees of A. squamosa and 25 trees of A. muricata were identified from the homesteads of Ernakulam, Thrissur and Palakkad districts of Kerala. The accessions were notated as AR for A. reticulata, AS for A. squamosa and AM for A. muricata. They were further evaluated for their morphological, biochemical characters as well as for sensory evaluation. Tree characters, leaf characters, inflorescence characters, fruit characters and quality parameters were recorded as per IPGRI crop descriptor. Morphological characters such as tree, leaf, floral and fruit characters were distinct for the three species. Flowering and fruiting seasons exhibited wide variability among the three species irrespective of districts. In A. reticulata and A. muricata, flowering was from August to March and fruiting was from September to May. In A. squamosa, flowering was observed from January to June and fruiting was from February to August. Wide variability was observed in fruit characters and quality parameters of A. reticulata accessions. The fruit weight ranged from 110 g (AR 14) to 435 g (AR 9).TSS, titratable acidity, total sugar and antioxidant activity of the fruits ranged from 13.4 0Brix (AR 8) to 16.6 0Brix (AR 6), 0.16 to 0.29 per cent, 9.7 (AR 13) to 11.36 per cent (AR 26) and 1.26 mg (AR 7) to 2.86 mg (AR 6) of ascorbic acid per g of sample respectively.In A. squamosa, individual fruit weight varied from 81.5 g (AS 6) to 116.9 g (AS 16). The TSS, titratable acidity, total sugar and antioxidant activity of the fruits ranged from 18.23 0Brix (AS 3) to 19.9 0Brix (AS 7), 0.16 to 0.22 per cent, 11.26 (AS 3) to 12.78 per cent (AS 7) and 1.64 mg (AS 14) to 2.86 mg (AS 2 and AS 7) of ascorbic acid per g of the sample respectively. Fruit weight in A. muricata ranged from 410 g (AM 2) to 850 g (AM 18).TSS of the fruit samples varied from 12.2 0Brix (AM 16) to 14.9 0Brix (AM 19). The titratable acidity, total sugar and antioxidant activity ranged from 0.36 to 0.38 per cent, 7.72 (AM 23) to 9.57 per cent (AM 19) and 3.52 mg (AM 2) to 4.52 mg (AM 25) of ascorbic acid per g of sample respectively. The principal component analysis of accessions based on all quantitative observations separately for the three species revealed variability existing between them. The common and distinct characters of the species were fruit weight, number of flakes per fruit and shelf life. The principal component analysis for three species was performed separately to determine promising types based on the characters such as fruit weight, yield of fruits per tree, number of seeds per fruit, TSS, acidity, total sugar and antioxidant activity. The clustering of the three species done separately using score plot confirmed that the promising accession in A. reticulata is AR 2, in A. squamosa are AS 7 and AS 11 and in A. muricata is AM 8. In sensory evaluation, the accessions AR 21 and AR 3 of A. reticulata, AS 8 and AS 16 of A. squamosa and AM 19 and AM 12 of A. muricata were preferred by the panelist. The study revealed that the three different species of Annona had wide variability in terms of their growth, vegetative, flowering and fruit characters. Among the three species, with regard to fruit quality parameters, Annona squamosa wassuperior in TSS and total sugar whereas fruits of Annona muricata were superior with respect to antioxidant activity. Performance of the identified promising types is to be evaluated for another 3-4 years so as to ascertain the performance. There is also a scope for extending the studies to other districts so as to make an account of the total variability available and to select the most promising types in each species suited for Kerala condition.
Early performance of mandarin oranges (Citrus reticulata Blanco.) of different rootstocks in the submontane region of Wywad in Kerala
(Kerala Agricultural University, 1988) Devadas, V S; Jessy M Kuriakose; Kannan, K
Twenty stionic combinations involving scions of five mandarin orange varieties and four rootstocks were evaluated for their performance under the agroclimatic conditions of Wynad, Kerala since 1980. The first six years study showed that Coorg mandarin on Rough lemon was the most vigorous combination in respect of all the biometric characters recorded. Rough lemon was the most invigorating rootstock, while Trifoliate stock induced dwarfness of scions. Though it was too prematureto assess the yield potential, data recorded in 1984, 1985 and 1986 showed that Coorg mandarin on Rough lemon was comparatively higher in yield than most other combinations. With regard to quality also, it was on par with other combinations. Further studies will be continued.
Effect of fruit maturity, seed processing and storage methods on seed quality of ash gourd (Benincasa hispida Thumb.)
(Department Of Olericulture, College Of Horticulture, Vellanikkara, 1996) Bejoy Kannath; Devadas, V S
Evaluation - cabbage varieties for the high range zone of Kerala
(Kerala Agricultural University, 1996) Gopalakrishnan, T R; Varghese, C A; Giridharan, M P; Devadas, V S
Evaluation of cabbage varieties for five years at the Regional Agricultural Research Station, Ambalavayal resulted in the identification of a variety "September" adaptable to high altitude zones of Kerala. September is characterised by flat head with medium lightness having an average weight of 1.12 kg and diameter of 17 cm. Under the mild subtropical climate during winter, the establishment of plants and heading ability of the variety are excellent.
Evaluation of selected varieties of okra for yield and resistance to yellow vein mosaic
(Kerala Agricultural University, 1993) Sally K Mathew; Abdul Vahab, M; Devadas, V S; Anitha Cherian
Seven selected varieties of okra were evaluated foryield and YVMV disease resistance under field conditions for three years at the Department of Olericulture, College of Horticulture, Vellanikkara, Trichur. Considering yield and disease resistance, the performances of the varieties Selection-4 and Arka Anamika were promising.
Performance evaluation of certain rice cultivars
(Kerala Agricultural University, 1993) Susamma P George; Devadas, V S; Sansamma George; Pillai, G R
Experiments were conducted with 12 rice cultivars for three consecutive years from 1984-85 to 1987-88 during kharif and rabi seasons in randomised block design. Pooled analysis of the data for kharif and rabi seasons indicated that MO 4 registered the highest grain yield in the kharif (5068 kg/ha) and rabi (4891 kg/ha) crop seasons. Hence MO 4 can be recommended for cultivation in Wynad in both the seasons. Edavaka was also found to be a promising cultivar when grain yield, straw yield and comparatively shorter duration were considered and hence requires further studies.
Screening for non-bolting type (S) of Amaranthus suited for year-round planting
(Department of Olericulture, College of Horticulture, Vellanikkara, 1982) Devadas, V S; Gopalakrishnan, P K
The investigation, "screening for non-bolting type(s) of amaranthus suited for year round planting" was conducted during April 1981 to March 1982 at Instructional Farm of College of Horticulture, Vellanikkara with the following objectives - to isolate stable line (s) for yield and bolting, line (s) with negligible content of antinutrient factors. ie., nitrate and oxalates and to ascribe the reasons for bolting . The 25 amaranth genotypes belonging to four botanical species were grown in a randomised block design with 2 replications at monthly intervals. All the 25 genotypes varied significantly with regard to the total yield yield components and bolting. The heritability, phenotypic coefficient of variation and expected genetic advances were high for all the characters.
Standardisation of agrotechniques in phalaenopsis orchids
(Department of pomology and floriculture, College of horticulture, Vellanikkara, 2012) Narender Negi; Devadas, V S
The present study entitled “Standardisation of agrotechniques in Phalaenopsis orchids” was carried out at the Department of Pomology and Floriculture, College of Horticulture, Vellanikkara from May 2011 to April 2012. The studies were conducted to find out the best plant type and environment suited for commercial cultivation of Phalaenopsis and to standardise the agrotechniques like type of pot, growing media and growing method for better plant growth and quality spikes. The study involved comparison of 32 treatment combinations involving two plant types, two types of pots, two types of potting media, two growing conditions and two methods of growing. The experiment was laid out in CRD with three replications. Various vegetative and floral characters were recorded, analysed and correlated with weather parameters. Results indicated that of the two growing structures used in the study i.e., fan and pad and rain shelter, the latter promoted vegetative growth manifested by enhanced leaf length, leaf breadth and leaf area. Plant height was not influenced in both the situation. The plant types viz., pot plant and cut flower, differed in their growth rate. Pot plant type recorded higher growth rate in terms of length, breadth and area of leaf but per se length, breadth and area of leaf was higher in cut flower type. Regarding the media, brick + coconut husk bits was found better for vegetative growth as compared to brick + charcoal. The other two factors, method of growing and type of pots did not affect the vegetative growth. But root growth outside the pot was recorded more in black pot compared to that on white pot. Percentage of flowering was also influenced by growing structure, type of plant and media. Plants grown under fan and pad, pot plant type and brick + coconut husk bits medium recorded higher flowering percentage than those under rain shelter, cut flower and brick + charcoal medium. Correlation values with weather parameters indicated positive correlation between increase in leaf area and minimum temperature under rain shelter and fan and pad system whereas negative correlation with light intensity was seen under fan and pad system. Considering the overall effect by pooled analysis, only minimum temperature had a significant influence on increase in leaf area.
Variability in seed quality and storability of cowpea (Vigna spp.) varieties
(Department of Seed Science and Technology, College of Horticulture, Vellanikkara, 2015) Aswathi, C; Devadas, V S
Yield, quality and shelf life of bittergourd (Momordica Charantia Linn.) fruits as influenced by plant growth regulators
(Kerala Agricultural University, 1994) Veenakumari, D; Raju, V K; Devadas, V S
Effect of pre-harvest application of GA (200 and 300 ppm), CCC (250 and 500 ppm) and MH (500 and 1000 ppm) as compared to a no-spray control, on growth, quality components and storage life of hittergourd fruits of MC 84 was studied during 1992. The chemicals were applied twice; 10 days after the first fruit set and 15 days after the first application. GA at 300 ppm produced the highest yield, length and girth of fruits which was followed by GA 200 ppm. Moisture content was maximum in fruits obtained from plants treated with CCC at 250 ppm, whereas the highest ascorbic acid content was in fruits of GA (200 ppm) treated plants. Maximum shelf-life of fruits was observed with MH (500 ppm) spray.