Published in Scientific Papers. Series A. Agronomy, Vol. LXV, Issue 2
Written by Vera GUSHCHINA, Aleksei VOLODKIN, Anna LYKOVA, Natalya OSTROBORODOVA, Daria OSTROBORODOVA
Among the elements of Miscanthus giganteus cultivation technology, the most important link is the protection of plants from weeds. Weed component control is necessary in the most critical periods of plant development. For Miscanthus giganteus, mainly plots are allocated on low-fertility previously uncultivated lands with high weediness. In this regard, it became necessary to study the methods of weed control in the Miscanthus giganteus agrocenosis and their effect on the yield of plantations in the second year of life. Research to examine the aftereffect of herbicides on the formation of the productivity of Miscanthus giganteus was carried out in 2016-2018 on the experimental site of Penza State Agrarian University (Russia) on light gray forest sandy loamy soil. The most favorable weather conditions were in 2016. With optimal thermal conditions and sufficient precipitation, by the end of the growing season, the plants reached a height of 239.0-300.0 cm with the number of stems 12.0-22.0 pcs/plant. The maximum yield of Miscanthus giganteus dry mass of 11.35 t/ha was obtained by applying the herbicide based on metsulfuron-methyl against the background of glyphosate. The return of frosts in May 2017 to minus 1.8°С led to the death of regrown plants and the number of stems after overwintering decreased to 4-8 pcs/m2, against 18-38 pcs/m in 2016. The highest stem density of 24 pcs/m2 on average over three years was noted in the agrocenosis, where in the year of laying the plantation of Miscanthus giganteus, against the background of glyphosate-containing herbicide, they were treated with preparations based on metsulfuron-methyl and 2.4D + florasulam.
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