Published in Scientific Papers. Series A. Agronomy, Vol. LXVII, Issue 1
Written by Bogomil MIHAYLOV
The main problem in the technology of growing winter oilseed rape comes down to overcoming adverse consequences in early and late development of winter oilseed rape, which leads to the failure of the harvest from the sown areas or unsatisfactory yields with low quality indicators. This necessitates the need to seek and use ways, methods and means to reduce or overcome these adverse consequences. One of the ways for this is the application of means /substances/ with growth-regulatory action and substances with biostimulating action. Therefore, it is necessary to study the influence of substances with growth-regulatory action and substances with biostimulating action. Rapeseed is a strategic crop for global agriculture. The application of growth regulators and biostimulators is an important element of the technology of growing winter oilseed rape. Plant growth regulators allow deployment of the productive potential of hybrids and increase the quality indicators of the production. They lead to morphological and physiological changes in plants, plant growth inhibition, inhibition of plant gibberellins biosynthesis and inhibition of sterol biosynthesis, reduction of internode elongation, increased chlorophyll content, delayed senescence, increased antioxidant potential and improvement in alkaloid production. Bioregulators reduce the biotic and abiotic stress in plants. Their use leads to an increase in cellular energy, the permeability of the cell membranes of the root system increases, the penetration of mineral nutrients from the soil solution into the plants is improved, which promotes better absorption of nutrients by the plant, the growth of the root system increases, the aboveground mass and dry matter yield. The application of plant bioregulators leads to an increase in productivity and its quality, but also contributes to the development of sustainable agriculture and the protection of the environment. Analytical review of cited sources and presented results regarding various aspects of impact on growth, development, productivity and quality gives reason to conclude that the toolkit that will be applied to develop strategies and biotechnological approaches to overcome stress in the development of rapeseed.
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