Sowing quality of seeds sunflower, depending on the influence of plant growth regulators and protectants

Abstract

Aim. The aim of this work was to study the influence of plant growth regulators and protectants on the sowing quality of seeds parental forms and hybrids of sunflower.Methodology and materials. Research conducted in the Plant Production Institute named after V.Ya. Yuriev NAAS. The predecessor of sunflower – winter wheat. Sunflower seeds parent lines Сх1010А, Х720В, Х526В and hybrids F1 Romance and Maximus were sown in optimal terms with the seeding norm of 57 thousand pieces of viable seeds per 1 hectare.Presowing processing of seeds of sunflower regulators of plant growth Radostim and Treptolem combined with preplanting treatment Apron and Cruizer.Results. Presowing seed processing by growth regulators of plants in combination with protectants provides increase laboratory germination of the seed lot with reduced sowing qualities: line Сх1010А on 4–8 %; line Х526В on 4–12 %; line Х720В on 2–16 %. On the germination of seeds of sunflower lines in control variants 95–98 % and hybrids 93–98 % additional increase laboratory germination in a result of seed treatment with plant growth regulators and protectants is not installed.The most significant increase of the field germination of seeds obtained for favourable weather conditions, in particular lines of sunflower on 3–17 % and hybrids on 1–8 %.The improvement in laboratory and field germination of seeds in the variants of application of plant growth regulators provided formation of a given density of plants prior to harvesting sunflower. The number of plants of sunflower lines before gathering harvesting in the variants of application of growth regulators increased on 6.0–10.8 thousand pieces/hectare, sunflower hybrids on 1.8–3.1 thousand pieces/hectare.Increased germination of seeds lines sunflower obtained from harvest in variants of application of growth regulators on 2 %.Conclusions: Presowing seed processing by growth regulators of plants in combination with protectants provides increase laboratory germination of seeds sunflower lines on 2–16 %, increasing field germination of seeds sunflower lines on 3–17 % and hybrids on 1–8 % and improved sowing qualities seed parent lines of sunflower received with harvest.