Author(s):

N Nireshkumar, S Saraswathy, A Subbiah and K Venkatesan

Abstract: An experiment was conducted to assess the effect of pre-harvest treatments on biometrical, physio-chemical and shelf life in grapes variety Muscat Hamburg. The experiment was conducted in randomized block design with 14 treatments (T₁ (Ca(NO_3­)₂ 0.5%)_, T₂ (Ca(NO₃)₂ 1.0%), T₃ (KNO₃ 0.5%), T₄ (KNO₃ 1.0%), T₅ (CaCl₂ 0.5%)_, T₆ (CaCl₂ 1.0%)_, T₇ (sulphate of potash (SOP) 0.5%), T₈ (SOP 1.0%), T₉ (T₁+T₃), T₁₀ (T₂+T₄), T₁₁ (T₅+T₇), T₁₂ (T₆+T₈), T₁₃ (water spray) and T₁₄ (control)) in two replications and imposed at berry development and veraison stage. The data revealed that T₁₂ showed the highest values for bunch weight, fruit yield vine^-1, berry diameter, berry weight, seed weight, berry firmness, juice recovery, TSS, total sugars, reducing sugars, non-reducing sugars, shelf life, petiole potassium and berry potassium with the least berry cracking, berry shattering, PLW and berry rotting. While T₁₄ showed the lowest values for yield and quality parameters. The treatment T₁₁ recorded the highest anthocyanin and total phenols content. T₁₀ expressed the maximum nitrogen content in petiole, whereas T₈ recorded the highest petiole phosphorus. The petiole calcium was more in T₆. The highest petiole magnesium was found in T₃.

DOI: 10.22271/phyto.2020.v9.i5ae.12678

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