Postharvest treatments with calcium-based bioactivators to preserve table grape quality (Vitis vinifera L) cv. Red Globe during storage

Abstract

The article presents the results of studies on the use of calcium-based bioactivators in aerosol spraying of V. vinifera L cv. Red Globe in the postharvest period and the assessment of its impact on the quality of grapes during storage (30 and 90 days). In the international practice calcium-containing preparations are widely used to solve problems of quality preservation of the resulting crops. Level of calcium in fruits and berries affects the duration of storage by increasing the resistance to pathogens. Calcium-containing preparations are safe for human health and can become good alternative to synthetic fungicides and SO2 when storing and improving the quality of table grapes. In the work we used calcium-based bioactivators Brentax Ca in concentrations of 50 and 75g per 20l of water; Brentax KCa - in concentration of working mixture - 50g / 20l and Master Green Ca in concentration of 35g / 20l. The following parameters were evaluated: mass concentration of dry matter and titratable acids, weight loss of bunch and organoleptic parameters.High efficiency was performed by preparations Master Green Ca and Brentax Ca 50. Their use made it possible to reduce significantly the weight loss of bunch towards the end of storage by 45 and 34% compared to the control, to preserve organoleptic parameters (7.8 and 7.6 points), respectively, at the level of fresh grapes during storage owing to safekeeping of stem in a flexible condition, preservation of natural color, turgor of berries and balanced flavor. The data obtained will allow improve the system of long-term storage of grapes due to the use of calcium-based bioactivators Master Green Ca and Brentax Ca in concentration 50g / 20l of water.