Influence of foliar application of boron, iron and magnesium on quality attributes and leaf nutrient status of guava cv. Hisar Surkha.

Foliar application of nutrients escalates efficient use of nutrients along with quick response. An experiment was undertaken to study the effect of foliar application of mineral nutrients viz., boron (B), magnesium (Mg) and iron (Fe) sprayed at different growth stages viz., at fruit set and one month after first spray at the experimental orchard of Chaudhary Charan Singh Haryana Agricultural University, Hisar, Haryana during year 2020–21 and 2021–2022. The experiment was conducted in a Randomized Block Design with 21 treatments and 3 replications with a spacing of 6 × 6 m. Foliar sprays with boron, magnesium and iron significantly affected the physio-chemical properties of the fruits. Total soluble solids, TSS acidity ratio, ascorbic acid, total sugar, reducing sugar, non-reducing sugar and pectin content were found to be maximum under the treatment T₂₁ [FeSO₄ (0.5%) + H₃BO₃ (0.5%) + MgSO₄ (0.5%)] while in case of titratable acidity was found significantly lowest under the treatment T₂₁ [FeSO₄ (0.5%) + H₃BO₃ (0.5%) + MgSO₄ (0.5%)]. Treatments also affected the leaf chlorophyll content and leaf nutrient status significantly. It can be concluded from this study that foliar sprays of boron, magnesium and iron are beneficial for improving fruit quality, leaf chlorophyll content and leaf nutrient status of guava cv. Hisar Surkha. Further, 0.5 per cent each of FeSO₄, H₃BO₃ and MgSO₄ foliar sprays two times at one month's interval can obtain the best results in terms of quality of fruits. [ABSTRACT FROM AUTHOR]