INFLUENCE OF GIBBERALIC ACID ON GROWTH, YIELD AND QUALITY OF TOMATO CV. BIPUL PLUS

Abstract

An experiment was conducted at the experimental field of Hajee Mohammad Danesh Science and Technology University (HSTU), Dinajpur during the period from January 2024 to June 2024 to observe the effects of gibberellic acid (GA3) on growth and quality of tomato cv bipul plus. The experiment consisted of five doses of GA3 acid such as 10, 20, 30 and 40 ppm with control. The experiment was laid out in a Randomized Complete Block Design (RCBD) with 15 plots. Different doses of GA3 showed significant influence on almost all the parameters studied concerned with growth and quality contributing characters of tomato. The hormone GA3 (40 ppm) produced the tallest plant (72.94 cm) at 60 DAT, maximum number of leaves (96.00), maximum number of flowers (38.00), maximum number of fruits (20.00), maximum diameter of fruit (4.46 cm) and maximum fresh weight of fruit (53.33 g) in T4 treatment. Maximum number of branches per plant (12.00) at 60 DAT produced by T2 (20 ppm). On the other hand, minimum number of leaves (66.67) at 60 DAT, minimum number of branches (9.00), minimum number of flower (23.33), minimum length of leaf (37.39 cm), minimum diameter of fruit (3.89 cm), minimum fresh weight of fruit (42.01 g) were recorded from the treatment of 10 ppm GA3 (T1 treatment). The shortest plant height (72.94 cm) at 60 DAT, minimum number of fruit (14.33) produced by T2 (20 ppm) treatment. The highest amount of total sugar (6.1 mg/100g), β carotene (14.48 mg/100g), vitamin C (29.0 mg/100g), sodium content (41.16 mg/100g), potassium content (108.92 mg/100g), calcium content (40.1 mg/100g) were recorded from 40 ppm (T4 treatment). The lowest amount of total sugar (5.3 mg/100g), lowest ash content (0.48%), value of β carotene (5.26 mg/100g), value of vitamin C (16.43 mg/100g), sodium content (36.86 mg/100g), potassium content (98.3 mg/100g), calcium content (29.55 mg/100g) were recorded from 10 ppm GA3 (T1 treatment). The highest amount of moisture (95.49%) was obtained from T1 (10 ppm) treatment. On the other hand, the lowest amount of moisture (94.23 %) was recorded from T2 (20 ppm) treatment. From experiment, T2 (20 ppm) treatment was given the highest amount of ash (0.64%), protein (1.65%) and ß-carotene (14.48 mg/100g). The highest amount of reducing sugar (5.5 mg/100g) was recorded from T3 (30 ppm) treatment and the lowest amount of reducing sugar (3.85 mg/100g) was recorded from T0 (control) treatment. So, it can fairly be concluded that the application of gibberellic acid at 40 ppm is quite effective to increase growth, yield and quality of tomato.