The present investigation was carried out at Horticultural Research Centre of Sardar Vallabhbhai Patel University of Agriculture and Technology, Meerut. The experiment titled “A study on yield attributes of guava (Psidium guajava L.) cv. Lalit affected by foliar application nano urea and chelated zinc” was laid out in a Factorial Randomized Block Design (FRBD) and the number of treatments were 16 viz., T1- control, T2- nano N 1.5 ml, T3- nano N 3.0 ml, T4-nano N 4.5 ml, T5- chelated Zn 0.4%, T6- nano N 1.5 ml + chelated Zn 0.4%, T7- nano N 3.0 ml + chelated Zn 0.4%, T8- nano N 4.5 ml + chelated Zn 0.4%, T9- chelated Zn 0.8%, T10- nano N 1.5 ml + chelated Zn 0.8%, T11- nano N 3.0 ml + chelated Zn 0.8%, T12- nano N 4.5 ml + chelated Zn 0.8%, T13- chelated Zn 1.2%, T14- nano N 1.5 ml + chelated Zn 1.2%, T15- nano N 3.0 ml + chelated Zn 1.2% and T16- nano N 4.5 ml + chelated Zn 1.2%, each replicated thrice. Because horticulture crops mostly rely on chemical fertilisers, precise nutrient management of these crops is a significant challenge on a global scale. Traditional fertilisers can be hazardous to people and the environment in addition to being expensive for the producer. Due to this, people are looking for environmentally acceptable fertilisers, especially ones that are highly nutrient-efficient, and nanotechnology is emerging as a possible substitute. Out of the 16 treatment applied, the results revealed that treatment T12 recorded the highest number of fruits per tree (179.67 and 180.33), maximum fruit yield per tree (18.53 and 18.59 kg) and yield per hectare (205.90 and 206.50 q/ha). Among nano urea and chelated zinc doses, T4 and T9 were found to be best.

Guava, Nano Urea, Chelated Zinc, Yield Attributes, Foliar Application, Nutrient Management, Nanotechnology and Environmental Sustainability

Based on above investigation, it was observed that there was significant effect of nano urea and chelated zinc yield attributes of guava cv. Lalit. It can be concluded that guava plants sprayed with combination of nano urea@ 4.5 ml/tree and chelated zinc @ 0.8% recorded maximum number of fruits per tree, fruit yield per tree and yield per hectare. Among the doses of nano urea applied, nano urea@ 4.5 ml/tree performed the best and nano urea@ 3.0 ml/tree was also found to be at par. Also, the single doses of chelated zinc applied, chelated zinc @ 0.8% recorded the best findings and chelated zinc @ 1.2% was found to be at par with it. Therefore, it can be recommended that under western Uttar Pradesh conditions, guava trees when sprayed with combination of nano urea (4.5 ml/tree) and chelated zinc (0.8%) thrice, starting from one month before flowering, at full bloom and at fruit set, along with recommended cultural practices increases the yield attributes of guava.

Shalini Singh, Arvind Kumar, Satya Prakash, Vipin Kumar, Aastha Dubey, Vishal Gangwar and Amit Kumar (2023). Enhancement in Yield Parameters of Guava (Psidium guajava L.) cv. Lalit through Foliar Application of Nano Urea and chelated Zinc under Western Uttar Pradesh conditions. Biological Forum – An International Journal, 15(8): 402-407.