Radiation processing of fruits involves exposure to short wave energy to achieve a specific purpose to maintain the physiological changes and sensory quality of the product. The effect of gamma irradiation and storage temperature on physiological changes and organoleptic properties of mango fruit var. Kesar was studied. The fruits were exposed to gamma radiation at different doses i.e. 0.00kGy, 0.20kGy, 0.40kGy and 0.60kGy from the radio isotope C storage temperature with 90% RH recorded maximum reduction in physiological loss in weight and reduced ripening. The minimum physiological loss in weight and ripening and highest marketability of fruits was recorded from fruits irradiated with 0.40kGy gamma rays and stored at 12 o C storage temperature with 90 RH including maximum scores on skin colour, pulp colour, texture, taste and overall acceptability at the end of shelf life (41.43 days).
Abstract:The present investigation was carried out at the Forestry Research Farm, Navsari Agricultural University; Navsari to evaluate the gamma rays at 10 kR, 20 kR and 30 kR induced variability in Jatropha curcas L. on germination, growth and yield for seven Jatropha genotypes (Phule J-1, Urlikanchan, Hansraj, SKN Big, Chhatrapati, Hansot and MPJ-55). The significantly maximum germination percentage (66.96%), seedling survival (74.18%), seedling collar diameter (0.958cm), shoot length (49.442cm), number of leaves per seedling (7.757) and leaf area (37. 58) was observed in Chhatrapati genotype during nursery stage. While low rate of gamma rays treatment (10 kR) had stimulatory effect for germination percentage, seedling survival, seedling collar diameter, shoot length, number of leaves per seedling and leaf area. However, higher gamma rays doses (30 kR) drastically reduced all studied characters. The interaction effect of genotype and gamma rays were significant for number of leaves per seedling. Further, it was not significant in other traits like germination percentage, seedling survival, seedling collar diameter, shoot length and leaf area.
Rooftop water harvesting is an ideal technique to collect and store rainwater for drinking purposes. However, with time, in spite of all precautions, there is a possibility of development of microbes in stored water, making it unsafe for drinking. An attempt was made at Navsari Agricultural University, Gujarat to design the rooftop water harvesting system in such a way that stored water meets the annual water demand maintaining the quality of water at minimum cost. The water harvesting system was constructed at six locations and water quality in the storage tanks was monitored at regular intervals. Physical, chemical and bacterial quality of harvested rainwater was evaluated in laboratory and the water was found to be of excellent quality. However, microbial growth was found to be present at few places over the time. Laboratory study was undertaken to find economical solution to remove microbes from the stored water before consumption using copper vessel, silver strip of 30 cm × 10 cm × 0.03 cm size, commercially available cloth filter, earthen pot, and control (without any treatment). The results revealed that copper vessel showed maximum inhibitory effect on coliform as well as total bacterial count when water was stored for 12 h and 24 h. Though, there was a slight increase in copper residue, but it remained within the permissible limits. Therefore, vessel made up of copper could safely be used for antimicrobial treatment to purify the drinking water. The methodology could be useful to meet the precariously deteriorating potable water situation in rural areas especially for the poor people of developing economies.
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