Ritesh Kumar Jha 1 , Arjun Kumar Shrestha2 , Baikuntha Adhikari3 , Basanta Kumar Shrestha4
1 Faculty of Agriculture, Agriculture and Forestry University, Rampur, Chitwan, Nepal
2 Department of Horticulture, Agriculture and Forestry University, Rampur, Chitwan, Nepal
3 Ministry of Agriculture Development, Government of Nepal
4 Prime Minister Agriculture Modernization Project, Government of Nepal
Corresponding author e-mail: ritesh.lord.of.truth@gmail.com
Abstract
An experiment was carried out under naturally ventilated greenhouse to assess the performance of tomato cv. Srijana as influenced by GA3 and NAA during the summer season of 2018-2019 at Pokhara, Kaski, Nepal. Treatments comprised of four levels of GA3 (i.e. 0 ppm, 25 ppm, 50ppm and 75 ppm) each combined at four different levels of NAA (i.e. 0ppm, 25ppm, 50ppm and 75 ppm). The result revealed that the fruit yield was significantly influenced by the levels of GA3, NAA and their interactions. Among four levels of NAA, the highest yield (109.91metric ton ha-1) of tomato was recorded with NAA at 25 ppm which was 10.37%, 17.47% and 24.78% higher over NAA at 0ppm, NAA at 50ppm and NAA at 75ppm respectively. Similarly, a significantly higher yield (103.46metric ton ha-1) of tomato was attained with GA3 at 50 ppm and it was 13.91 %, 10.31% and 6.74 % higher over GA3 at 0ppm, GA3 at 25 ppm and GA3 at 75 ppm respectively. Interactions between GA3 and NAA levels were significant for all yield attributes. Regression analysis on the effect of GA3 and NAA on the yield of tomato showed polynomial regression equation, while the physical maximum dose of GA3 was 52.65 ppm and NAA was 20.29 ppm respectively. It can be concluded that the production of tomato could be improved by the combined application of GA3 at 50 ppm and NAA at 25 ppm under the protected condition of Pokhara, Nepal.
Keywords: GA3, Greenhouse, NAA, Tomato, Yield