Effectiveness of growth regulators application in table grape yield and postharvest quality during storage

The influence of growth regulators was studied based on yield and quality of table variety ?Moldova? and by the dynamics of post-harvest storage. The use of growth regulators during 30% fungicide load reduction enhances the weight of grapes and berries harvest by 11-14%, increases the mass concentration of sugar in juice and improves the sensory evaluation to 8.2-8.8 points. The yield of standard products in the experiment variants? was increased by 3.6 -7.7% compared to the control. The impact of growth regulators on sensory evaluation of table grapes and the value of the natural losses of a bunch mass during storage period are described.? The results show that the use of growth regulators significantly improves the quality of ?Moldova? table variety. The study demonstrated that after 90 days of storage the natural cluster weight loss index was lower in the grapes that had been treated with the preparation as compared to control. Under treatments with different growthregulators, the sensory evaluation of Moldova variety rises up to 8.4-8.7 points. In addition, it is shown that these indicators were preserved over the long-term storage of grapes. The tested products were Albit and the fertilizer Mival-Agro. The active ingredient of?Albit is a microbial biopolymer poly-?-hydroxybutyrate (PHB). PHB is a natural storage compound of beneficial soil bacteria (like starch in plants or fat and glycogen in animals). Mival-Agro is an humic fertilizer containing lignohumat and minerals. ConclusionsIn light of the foregoing experimental data, it can be concluded that application of "Albit" preparation increased 'Moldova' variety productivity during cultivation, both in conditions of drip irrigation and on arid soils. The use of "Albit" preparation increased the yield of 'Moldova' variety by 10.7 - 14.4%, improved commercial quality (by 7%) and transportable properties of Moldova grapes cultivated on arid soils, increased total sugars, improving the taste of fresh grapes, which affected the tasting assessment results (8.0-8.2 points in test samples). We registered an improvement in the organoleptic properties of Moldova grapes after ?Mival-Agro?application (taste panel score made 8.7 points), which was due to an accord in standard indices resulting from the use of the preparation. "Mival-Agro" application decreases activity of peroxidase and polyphenol oxidase along with respiratory gas exchange intensity, which allows longer-term preservation of biologically active substances? reserve, and reduces the natural loss of the mass of the grapes. Experimental treatment schedule of Moldova grapes with ?Mival-Agro? preparation provides for a net income of 240.6 thousand rubles per hectare, while treatment with ?Albit? preparation results in net income of 142.4 thousand rubles/ha. The obtained data provide rationale for the system of protective measures and organo-mineral fertilizing involving ?Albit TPC? and ?MivalAgro? preparations in agrotechnologies. SourcesEffectiveness of Growth Regulators Application of Table Variety Moldovany Yield and Quality in Postharvest Storage During Fungicide Load ReductionS. Levchenko, ?. Batukaev, I. Vasylyk, V. Boyko & D. BelashAdvances in Engineering Research, volume 151: 900-904International Conference on Smart Solutions for Agriculture (Agro-SMART 2018)Picture by?Mad Farmer