Abstract
Aim: Guava (Psidium guajava L.) is a member of the family Myrtaceae and the order Myrtales which is 4th most important crop in India after mango, increasing productivity. Therefore, In addition to Plant growth regulator are required for proper growth, yield and quality of guava.
 Study Design: The experiment comprised of 10 treatments of different levels of PGR replicated thrice in a Randomized Block Design. The main objective of the experiment was to find out the effect of different PGR on growth, quality as well as to evaluate the yield and yield attributes of guava. Three concentrations of gibberellic acid (GA3) at 100, 150 and 200 ppm, three concentrations of naphthalene acetic acid (NAA) at 50, 100, and 150 ppm, and three concentrations of Brassinosteriods at 200, 400, and 600 ppm.
 Place and Duration of Study: So, to find out Effect of Plant Growth Regulators and Brassinosteroids on Growth, Yield and Quality of Guava (Psidium Guajava L. Cv. Allahabad Safeda") A field experiment was conducted at the Central Research Farm, Department of Horticulture, Naini Agricultural Institute, Sam Higginbottom University of Agriculture, Technology and Sciences (SHUATS), Prayagraj, during 2021- 22.
 Results: Treatment T9, which consisted of the T9 (Naphthalene Acetic Acid (NAA) @150ppm) had the best effect on Plant height (335.7 cm), number of flowers per plant (61.3), fruiting buds per plant (151.8), number of fruits per plant (48.23), fruit weight (137.7 g), Fruit length (5.36 cm), fruit diameter (7.33), weight of pulp/fruit (104.57 g), weight of seed/fruit (6.74 g), total soluble salts (TSS) (10.97○ Brix), vitamin C content (188.52 gm) ,total sugar (8.03), acidity (1.27 %) and yield (33.3 t/ha).
 Conclusion: According to the present investigation it is concluded that treatment T9 T9 (Naphthalene Acetic Acid (NAA) @150 ppm) was found most effective in terms of growth, yield and quality of Guava (Psidium Guajava L. Cv. Allahabad Safeda").
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