The effect of foliar fertilizing on ecological optimization of the application of fungicides on the productivity and phenolic complex composition of grapes

A Batukaev,E Ostroukhova,S Levchenko,P Probeigolova,N Lutkova,I Peskova,V Boyko,D Belash,P Roca

doi:10.1051/bioconf/20191501012

Abstract

One of the ways to reduce the pesticidal burden in mature ampelocenoses is the use of foliar bio-preparations of multifunctional action. We studied the influence of growth bioregulators “Albit” and “Mival-Agro” at reduced by 25–50% fungicidal load on productivity and phenolic complex composition (using the HPLC method) of Vitis vinifera “Asma” (Crimean autochthonous table cultivar), “Cabernet Sauvignon” and table grapes of complex genetic structure “Moldova”, grown in the mountain-valley seaside region of Crimea. It was established that bio-regulators increase the harvest of grapes, especially in the first and third years of treatment, depending on the preparation and grape cultivar, by 27–64% and 24–29%, respectively, as compared to control; the bunch weight increased by 134 ± 41%. The first two years of treatment enhance sugar accumulation in berries by 0.7–2.6 Brix. “Albit” preparation proved to be more effective as compared to “Mival-Agro”. The use of “Albit” on “Moldova” and “Cabernet Sauvignon” grapes increased components content in the berries by 19%–88% relative to control, depending on the cultivar and year of treatment, of which: anthocyanins – by 23–83%, stilbenes – by 24–138%. Regardless of treatment, the anthocyanin complex consisted by 75–87% of malvidin monoglucosides in “Cabernet Sauvignon” and “Asma”; 22–56% of malvidin monoglucosides and 21–62% of malvidin diglucoside in “Moldova”. The studied preparations had no significant impact on the quality of wines from “Cabernet Sauvignon”, however, they improved the quality of table grapes and their preservation capacity during storage.

Highlights

The intensive farming practices adopted in the world practice since the mid-20th century with the aim of increasing the crop yields include the widespread application of chemical agents to provide plants with nutrients and protect them against pests, diseases, and weeds
We studied the influence of growth bioregulators “Albit” and “MivalAgro” at reduced by 25–50% fungicidal load on productivity and phenolic complex composition of Vitis vinifera “Asma” (Crimean autochthonous table cultivar), “Cabernet Sauvignon” and table grapes of complex genetic structure “Moldova”, grown in the mountain-valley seaside region of Crimea
The issues addressing the rational use of soil resources and reduced pesticidal burden in mature ampelocenoses are relevant in viticulture, being a monoculture

Summary

Introduction

The intensive farming practices adopted in the world practice since the mid-20th century with the aim of increasing the crop yields include the widespread application of chemical agents to provide plants with nutrients and protect them against pests, diseases, and weeds. One effective way of addressing this problem is to stimulate plant’s own defense system by introducing mineral nutrition elements in the form of foliar biopreparations of multifunctional action [4, 5]. This generates a considerable scientific and practical interest in the development of new foliar preparations of biological origin, optimization of their composition, timing, doses and methods of application [6, 7]. Aleinikova et al demonstrated that it is possible to reduce the frequency of treatment and rates of chemical pesticides application during one treatment (by 30%) without reducing their biological effectiveness against major malevolent objects due to the rational use of multifunctional bio-preparations [7]

Methods

Results

Conclusion