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CNAA / Theses / 2021 / July /

The impact of microelements and biofertilizers on the realization of the potential for productivity and resistance of grapes


Author: David Tatiana
Degree:doctor of agriculture
Speciality: 06.01.04 - Agrochemistry
Year:2021
Scientific adviser: Sofia Velixar
doctor habilitat, professor, Institute of Genetics, Physiology and Plant Protection of the ASM
Institution: Institute of Genetics, Physiology and Plant Protection of the ASM

Status

The thesis was presented on the 9 July, 2021
Approved by NCAA on the 4 October, 2021

Abstract

Adobe PDF document1.07 Mb / in romanian

Thesis

CZU 631.81 : 579.64 : 634.8

Adobe PDF document 4.84 Mb / in romanian
130 pages


Keywords

grapes, trace elements, plant growth promoting bacteria, biofertilizers, growth, productivity, resistance, bio absorption

Summary

Structure of the thesis: Introduction, 5 chapters, conclusions, practical recommendations, bibliography - 252 cited sources, 41 tables, 7 figures, 118 pages. The results are published in 17 scientific papers and 2 patents.

The domain of study: - 411.03- Agrochemistry The aim of the work: To reveal the contribution of trace elements complex MicrocomV and bacterial products of PGPB strains (Azotobacter chroococcum, Pseudomonas fluorescens, Pseudomonas aureofaciens) in regulation of plant nutrition aimed at increasing of the productivity and resistance of the grapes to unfavourable conditions during the winter period.

The novelty and the scientific originality: The complex studies in the soil-plant system were conducted, focused on the elucidation of the modifications of some agrochemical, physiological and morphological parameters depending on the nutrition of the plants and growing conditions in order to elaborate the procedures for increasing the resistance to wintering and production of Vitis vinifera L. For the first time the interaction and application of the trace elements complex Microcom-V with the metabolism products of PGPB bacteria (suspensions, metabolites, biosurfactants), known as biofertilizers, have been studied with the purpose of regulating the nutrition of grapes.

The important scientific problem solved. It was shown that PGPB, that produce different biological substances, influences not just growth, but also are actively involved in various metabolic processes related to productivity. The beneficial contribution of the trace elements in a reduced dose and biofertilizers on the mineral status of seedlings and fruit-bearing plants, also in the accumulation of stress-protective compounds (proline, carbohydrates, and photosynthetic pigments) depending on the growth conditions, followed by increased resistance and productivity of grapes, was revealed. The combined use of trace elements and biofertilizers contributes to the availability of nutrients and, as a consequence, to the improvement of the quality of cuttings, the quality and quantity of the crop.

Theoretical significance: The obtained data demonstrate the inductive role of trace elements and biofertilizers in the regulation of plant mineral nutrition, in the formation of plants tolerance to unfavourable growth conditions, in a more complete realization of the grape resistance potential to the winter. The obtained results significantly complement the information available in the literature on the role of biofertilizers in plant metabolism.

The practical significance of the work: The established scientific principles and obtained practical results allow us to elaborate the procedures for the regulation of mineral nutrition of plants in order to increase the efficiency of the most important branch of the Republic Moldova and reduce the chemical pressing on the environment.

Implementation of scientific results: The developed procedures can be applied in viticulture in order to increase the productivity and plant resistance to adverse conditions. The information obtained regarding the role of the complex of trace elements and biofertilizers in regulating the nutrition of plants and increasing the productivity and resistance of grapes, can be included in teaching courses on Agrochemistry, Viticulture and Ecology, in higher education institutions.