To improve the vegetative growth of the eureka lemon, studies were performed to standardize the doses of bio-regulators (GA3 and NAA), experiment was carried out during 2020 September to 2021 February in an open field, Central Research Farm, Department of Horticulture, from, Sam Higginbottom University of Agriculture, Technology and Sciences, Prayagraj. The experimental field was laid out in a randomized block design (RBD) with nine treatments of different concentrations of two kinds of bio regulators, namely NAA and GA3 with just one variety replicated thrice. The variety used in this experiment was Eureka Lemon. The experiment comprised eight foliar applications consisting of GA3 @ 10 ppm l-1, 15 ppm l-1, 20 ppm l-1, 25 ppm l-1; NAA @ 20 ppm l-1, 30 ppm l-1, 40 ppm l-1, 50 ppm l-1 with Control. Experiment results revealed that the imposition of different treatments had a significant effect on improving vegetative growth and establishment of the eureka lemon plants. The resul

Eureka lemon, Seedlings, GA3, NAA, Bio-regulators, vegetative growth, establishment.

From the foregoing discussion it can be concluded that among the different suitable doses of NAA and GA3 treatment T8 NAA @ 50 ppm l-1 significantly bore maximum number of leaves, branches, stem girth and plant spread, whereas treatment T4 GA3@ 25 ppm l-1 gave significantly taller plants, maximum of chlorophyll content. Overall, treatment T8 NAA @ 50 ppm l-1 showed better result in the term of vegetative growth. Hence, for better growth and establishment it is recommended to apply the foliar application of bioregulators at initial stage of eureka lemon seedlings under Prayagraj agro-climatic conditions.

Das, P., Prasad, V.M., Bahadur, V., Topno, S.E. and Paruchuru, V.S.K.K. (2021). Effect of Foliar Application of bio-regulators (GA3 and NAA) on Vegetative Growth characters and Establishment of Lemon Citrus limon (L.) cv. Eureka under Subtropical Prayag