Реакция ярового рапса на предпосевную обработку семян инсектицидом и срок посева формированием урожайности

Abstract

During three vegetation periods (2015-2017), the effect of presowing seed treatment with insecticide and the sowing time on seed productivity and quality of spring rape of Accord variety was studied. Pre-sowing seed treatment was carried out 2 ... 3 days before the planting by Tabu insecticide (active substance - imidacloprid), VSK. Rape was sown at different times: early spring (perhaps early - after 5 days from it), medium spring - after 10-15 days possible early, late spring — after 20-25 days from possibly early. The experiments were laid on the sod-medium-podzolic medium loamy soil, the arable layer of moderate cultivation. The early spring period provided a longer rapeseed growing season (an average of 112 days over three years) and a relatively high seed yield of –235 g/m2. The yield advantage at the early spring sowing period is due to the greater 161 pcs per ton of plant standing before harvesting and plant productivity of 1.48 g. productive plants (164 pieces/m2). When sowing rape in medium spring and late spring, preseeding application of insecticide did not affect the yield. Sowing rape in the early and medium spring periods contributed to obtaining seeds with a higher fat content of 45%. The gross yield of fat was the highest 106 g/m2 when sowing rape in the early spring.