Effect of Different Chemicals and Manual Thinning on Crop Regulation in Guava (Psidium guajava)

The present experiment was conducted at Department of Horticulture, Naini Agricultural Institute, Sam Higginbottom University of Agriculture, Technology and Sciences, Prayagraj during the session March 2022 – December 2022. The experiment was laid out in randomized block design with three replications, and the study consists of ten treatment combinations including control by using different chemicals and manual thinning on Crop Regulation in Guava (Psidium guajava)”. The best treatment was T9 (Manual Deblossoming) & T6 (Ethrel@2500 ppm) which shows highest values in all the parameters viz., Number of flower plant-1 (120.55 & 130.55) Number of fruit plant-1 (101.22 & 120.15), Fruit set (%) (83.97 & 92.03), Fruit weight (g) (110.1 & 204.22), Fruit diameter (cm) (6.33& 6.78), Fruit yield plant-1 (kg) (11.14 & 24.54), Total soluble solids (0Brix) (10.15 & 12.55), Acidity (%) (0.2 & 0.14), Ascorbic acid (mg/100 g) (160.25& 165.25) and Pectin (%) (0.94 & 0.98) during rainy and winter season. All the treatments were significantly superior in their flowering, fruit yield and quality of guava cv. Allahabad Safeda over control (T0) and (T9). Increase flowering, fruit yield and quality was might be due to the increased duration of fruit quality during winter season as compared to summer.