Pre-harvest treatment of Chitosan and Potassium Schoenite on Yield, Quality, Biochemical Changes and Shelf Life in Manjari Shyama Grapes (Vitis vinifera L.)

Abstract

An investigation was carried out to know the effect of foliar application of Chitosan and Potassium Schoenite with different concentration on Manjri Shyama grape (Vitis. Vinifera. L.) at ICAR-NRCG Pune, during 2021-2022. The experiment was carried out in Randomized Block Design with five treatments and four replications. The application of Potassium Schoenite @ 2.5g/l , 5 g/l and Chitosan @ 0.2% and 0.4 % along with control vines was carried out at veraison stage. The effect of Potassium Schoenite and Chitosan were studied on bunch, berry characters, yield and quality parameters. The results revealed that the vines treated with chitosan 0.2 % recorded higher bunch weight (493.5 g) and yield/vine (38.42 kg).In terms of quality parameters i.e. TSS (21.98 Brix), Acidity (0.60%) were recorded in vine treated with Chitosan @ 0.2%. The Potassium Schoenite @ 5 g/l recorded higher phenol, tannin and flavonoids content. Among these treatment anthocyanin content was increased due to application of Potassium Schoenite, which is important for colour development of berry. From this investigation the foliar application of 0.2% of Chitosan and 5g/l of Potassium Schoenite reported higher yield, quality and improve shelf life of grapes.