Effect of Nano Zinc and Nano Iron on the Vegetative Growth of Guava (Psidium guajava L.) cv. Allahabad Safeda

In June 2023, the Department of Horticulture at Lovely Professional University in Jalandhar, Punjab conducted a field experiment. The experiment utilized a factorial Randomized Block Design with 9 treatments and 3 replications, covering a total of 27 plants. The experiment ran from June 2023 to December 2023. Regarding the individual effect of nano zinc, it was found that the application of nano zinc at a concentration of 200 ppm resulted in significant increases in various vegetative parameters. The maximum plant height increased by 18.06%, canopy spread increased by 30.16% East to West and 30.31% North to South, canopy volume increased by 121.34%, leaf length increased by 119.25%, leaf width increased by 110.94%, and leaf area increased by 363.27%. However, the increase in stem diameter was not significant compared to other treatments. Similarly, the individual effect of nano iron was also studied. The application of Nano Iron at a concentration of 150 ppm resulted in significant increases in various vegetative parameters. The maximum plant height increased by 17.26%, canopy spread increased by 27.63% East to West and 27.78% North to South, canopy volume increased by 109.42%, leaf length increased by 113.28%, leaf width increased by 107.08%, and leaf area increased by 343.06%. However, the increase in stem diameter was not significant compared to other treatments. The experiment revealed that among various treatment combinations, the application of Nano Zinc @ 200ppm + Nano Iron @ 150ppm (nZn2+nFe2) was observed significantly superior and maximum maximum plant height increased by 19.98%, canopy spread increased by 34.69% East to West and 34.88% North to South, canopy volume increased by 144.72%, leaf length increased by 130.89%, leaf width increased by 120.56% and leaf area increased by 409.25% over other treatments about vegetative parameters except stem diameter compared to other treatments.