Vol. 10, Issue 9 (2021)

Author(s):
Achyut Suman, AK Singh, Neeharika Kanth and Ajay Kumar

Abstract:
Guava (Psidium guajava L.) belongs to the family Myrtaceae. Guava fruit is a rich source of Vit. C and contain 0.5- 1.8% pectin. The origin of Guava is Tropical America and it was introduced to India through Portuguese in the early 17^thcentury. Zinc is basic constituent for protein and auxin manufacture and plays important role in production of seeds and proper fruit maturity. The foliar spray of micronutrient and PGR plays an important role in improving the fruit quality. Plant growth regulators like auxins, GA3 and cycocel obtain widely used to improve the fruit quality. A field experiment was conducted during 2018-19 at Guava block of model farm of DR. RPCAU, Pusa, Samastipur, Bihar on 7 year old plants of uniform size and vigour planted at (4) were selected for the study. Experiment was laid out under Randomized Block Design with three replications and 9 treatments, to know effect of foliar feeding of micronutrients and plant growth regulators on flowering and physical parameter of Guava. The minimum days to first flowering (36.33), maximum number of flowers (7.66) per shoot, highest fruit set per cent (92.33) and fruit retension (55.00) were found with 60 ppm GA3. The maximum fruit length (8.4 cm), fruit width (6.25 cm), fruit weight (110.25 g) and volume (116 ml), yield (46.0 kg/plant) were recorded under 0.4% Borax and specific gravity (1.10 g/ml) were recorded under 0.6% Zinc Sulphate.