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The present experiment entitled “Effect of Foliar Application of Nano Urea, Boron and Zinc Sulphate on Growth, Yield and Quality of Guava (Psidium guajava L.) cv. Allahabad Surkha” was conducted at Department of Horticulture, Naini Agricultural Institute, Sam Higginbottom University of Agriculture, Technology and Sciences, Prayagraj during the session 2022 - 2024. The experiment was laid out in randomized block design with three replications, and the study consists of ten treatment combinations including control. The best treatment was T9 (Nano urea 2.0% + zinc sulphate 0.6% + boron 0.6%) & T8 (Nano urea 2.0% + zinc sulphate 0.4% + boron 0.4%) which shows the highest values in all the parameters viz., number of flower/tree (86.47), Days taken to fruit harvesting (49.19), fruit set (74.00%), Number fruit/tree (63.25), Fruit length (7.42 cm), fruit weight (178.73g), fruit diameter (7.12 cm), fruit yield/tree (11.29 kg). Increased flowering, fruit yield and quality might be due to the increased absorption of nutrients when given as foliar application.
Kumar et al. (2024) studied this question.