Эффективность применения регулятора роста растений Сетар, КС* при выращивании рапса ярового на чернозёме выщелоченном Краснодарского края

Abstract

The productivity of spring rapeseed plants is significantly affected by the weather conditions of the growing season and the phytosanitary condition of the sowings. Plant growth regulators can increase crop resistance to environmental stress factors and pathogens. Combined application of plant growth regulators and fungicides is also an effective technique in rapeseed cultivation. In 2020–2021, on leached chernozem of the Krasnodar region, we studied the effectiveness of plant growth regulator Setar, SC during the cultivation of a spring rapeseed variety Tavrion. Setar, SC is a combination of a plant growth regulator paclobutrazol and a systemic fungicide difenoconazole. Spraying of rapeseed plants with Setar, SC preparation at the budding stage in doses 0.3, 0.4, and 0.5 l/ha has increased the preservation of the plant density by the harvesting time by 3.2–6.5 %, number of pods on plants – by 6.0–13.6, seeds – by 5.8–8.5, and thousand-seed weight – by 3.4–4.3 %. The application of preparation did not significantly affect the oil content of seeds of spring rapeseed. Due to the positive impact on the yield structure elements, the treatment of plants with the growth regulator Setar, SC resulted in the increase of seed yield of spring rapeseed by 0.15–0.22 t/ha and oil yield by 61–93 kg/ha on av-erage during the two years of research. The multiple correlation and regression analysis revealed the dependence of the yield of spring rapeseed variety Tavrion on the number of plants per 1.0 m2 and the number of seeds on the plants per 1.0 m2 with the impact proportions of 69.4 and 21.4 %, respectively. The optimal dose for spraying the spring rapeseed plants at the budding stage with Setar, SC preparation in the conditions of the central natural and climatic zone of the Krasnodar region was 0.4 l/ha.