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The present investigation on Guava (Psidium guajava L.) cv. G-27 was conducted during the year 2013-14 and 2014-15. Foliar spray of zinc, boron and magnesium was done as Zn₁ = Zinc sulphat @ 0.25%; Zn₂ = Zinc sulphat @ 0.50%; Zn₃ = Zinc sulphat @ 0.75%;B₁ = Boric acid @ 0.1%; B₂ = Boric acid @ 0.2%;  B₃ = Boric acid @ 0.3% ;Mg₁= Magnesium sulphat @ 0.20%; Mg₂ = Magnesium sulphat @ 0.40%; Mg₃  = Magnesium  sulphat @  0.60%. The result showed that Zn₃ recorded On the basis of results obtained in present investigation. It was found that foliar spray of zinc, boron and magnesium had significantly improved the various chemical characteristics of guava. From the different concentration Zn₃ and Mg₃ recorded highest TSS of 10.4, Zn_3, significantly lower the acidity. Ascorbic acid recorded 192.05% and 191.89% in Zn₃ and Mg_3. Higher concentration of zinc, magnesium and boron significant increase the sugar and pectin content also_. These results are on pooled basis of 2013-14 and 2014-15.

Key word: Guava, Zinc, Boron, Magnesium, Foliar spray, TSS, Acidity, Sugar, Pectin.