Research Journal of Agricultural Sciences Vol : 5 - Issue : 5 ; 845-851 TH Amarjeet Singh and A D Patel Department of Plant Physiology, Anand Agricultural University, Anand - 388 110, Gujarat, India Abstract The study was conducted at the Main Vegetable Research Station, Anand Agricultural University, Anand during the period kharif-rabi 20010-11 with the objective to determine the effects of different concentrations of GA3 and chemicals on quality and shelf-life of tomato. The experiment consisted of two main factors, factor A with two levels [Breaker stage (S1) and Redripestage (S2)] and factor B with nine treatments [GA3 @ 20 and 40 mg/l; KNO3 @ 2000 and 4000 mg/l; KHCO3 @ 2000 and 4000 mg/l; boric acid @ 100 and 200 mg/l with the control (without spray)]were arranged in 2 × 9 factorial randomized block design with three replications. The quality parameters viz total soluble solid (TSS), physiological loss of weight (PLW), decay or rotting, acidity, lycopene, ascorbic acid and carotenoid content influenced by stages of picking and post-harvest treatments of GA3 and chemicals had significant and positive effect over the control. The fruit harvested at red-ripe stage (S2) exhibited significantly the higher effect on various qualitative parameters. However, significantly the lowest PLW and decay loss were recorded under the fruits harvested at breaker stage (S1) as compared to the red-ripe stage. The post-harvest treatment of GA3 @ 40 mg/l (T2) recorded significantly the highest TSS (4.23 and 4.62%), acidity (1.43 and 0.95%), lycopene (6.40 and 8.75 mg), ascorbic acid (8.52 and 10.05 mg) and carotenoid content (17.33 and 19.25 mg) at initial (after harvest) as well as 6th day of storage, respectively. On the other hand, significantly the lowest PLW (0.18 %) and decay loss (33.47 %) were observed in the treatment T2 (GA3 @ 40 mg/l) and T1 (GA3 @ 20 mg/l) at 12th day of storage, respectively. While, the interaction effect between the harvesting stages (S) and post-harvest treatments (T) had non-significant effects in all the parameters except PLW and decay loss during the storage of tomato fruit cv. Anand Tomato-3.