The present study was conducted to evaluate the effect of foliar application of micronutrients on the growth, yield, and fruit quality of guava (Psidium guajava L.) cv. Shweta at the research farm of Mr. Lakhwinder Singh, Village Maujowal, Tehsil Nangal, District Rupnagar and Punjab. The experiment was laid out in a Randomized Block Design (RBD) with eight treatments: T₁ - ZnSO₄ @0.1%, T₂ - FeSO₄ @0.2%, T₃ - Borax @0.3%, T₄ - ZnSO₄ @0.1% + FeSO₄ @0.2%, T₅ - ZnSO₄ @0.1% + Borax @0.3%, T₆ - FeSO₄ @0.2% + Borax @0.3%, T₇ - ZnSO₄ @0.1% + FeSO₄ @0.2% + Borax @0.3%, and T₈ - Control. The results indicated that the combined application of ZnSO₄, FeSO₄, and Borax (T₇) significantly enhanced plant growth parameters, including plant height, stem girth, and tree spread (E-W and N-S), compared to the control and other treatments. The highest fruit yield (kg/plant) and number of fruits per plant were also recorded under T₇, followed by T₆ and T₅. Furthermore, fruit quality parameters such as total soluble solids (TSS), ascorbic acid content, and total sugars were maximized in T₇, demonstrating its superiority in improving guava fruit quality. The findings suggest that foliar application of ZnSO₄ @0.1% + FeSO₄ @0.2% + Borax @0.3% is the most effective treatment for enhancing growth, yield, and fruit quality in guava cv. Shweta

Guava, micronutrients, foliar application, growth, yield, fruit quality, ZnSO₄, FeSO₄, Borax

The present study demonstrated that foliar application of micronutrients significantly improves the growth, yield, and fruit quality of guava (Psidium guajava L.) cv. Shweta. Among the different treatments, the combined application of ZnSO₄ @0.1% + FeSO₄ @0.2% + Borax @0.3% (T₇) resulted in the highest improvements in plant height, stem girth, and leaf area. Additionally, T₇ recorded the highest fruit yield per tree, number of fruits per tree, and fruit quality attributes such as TSS, ascorbic acid content, and total sugars while reducing titratable acidity. The study confirms that foliar supplementation of zinc, iron, and boron plays a crucial role in enhancing guava production by improving nutrient uptake, metabolic activities, and physiological functions. Therefore, the foliar application of ZnSO₄ @0.1% + FeSO₄ @0.2% + Borax @0.3% can be recommended as an effective nutrient management strategy for maximizing guava yield and fruit quality under similar agro-climatic conditions. Author Contributions. All authors have contributed significantly in the research paper. Pallavi and Ravinder have conducted the research trial. Avinash, Sachin and Shivangi have provided all the necessary help in formatting, writing and reviewing of manuscript. Avinash and Sunidhi have done the analysis of the data

Ravinder Singh, Pallavi, Avinash Kumar Bhatia, Sachin Bhardwaj, Shivangi Sood1 and Sunidhi (2025). Optimizing Growth, Yield, and Fruit Quality of Guava (Psidium guajava L.) cv. Shweta through Foliar Application of Micronutrients. Biological Forum, 17(5a): 06-10