EFFICIENCY OF DIFFERENT WAYS TO PROTECT OF POTATO CROPS FROM WEEDS AFTER PERENNIAL GRASSES

V. V. Smuk¹, А. М. Shpanev^1,2
1Agrophysical Research Institute, Grazhdanskiy pr., 14, Saint-Petersburg, 195220, Russian Federation
²All-Russian Research Institute of Plant Protection (VIZR), sh. Podbel’skogo, 3, Pushkin, Sankt-Peterburg, 196608, Russian Federation

Abstract. In the North-West region of the Russian Federation the complex infestation type with a high level of perennial weeds forms in potato crops cultivated after perennial grasses. The authors determined the most effective weed control method for potato crops after such forecrop during 2014–2016 on the fields in Gatchina district, Leningrad region using the method of permanent registration sites. The mechanical method involved two unstriped pre-emergence and two inter-row post-emergence treatments with KON-2.8 + BRU-0.7, as well as hilling. In a variant with chemical protection, apart from hilling, two treatments with herbicides were carried out: Tornado, WS 3–5 days before the emergence and Titus, DFS + Trend 90 at a potato plant height of 10–15 cm. The combined method included two unstriped pre-emergence treatments with KON-2.8 + BRU-0.7, herbicide treatment with Titus, DFS + Trend 90 and hilling. The mechanical method showed insufficient efficiency; the loss of weed plants was 68%, according to the data averaged over the period of the studies, and it varied in the limits of 63–71% over the years. To the harvesting of potato, such plantations were strongly overgrown with weeds. Chemical weed control method of potato agrocoenosis was found to be more effective than mechanical one due to the greater efficiency against all groups of weeds. The total weed destruction after all activities provided by this variant was 77% (from 80 to 91%). The combined protection option, in its effect on weed vegetation, surpassed the mechanical one by 19.9%, the chemical variant – by 10.6%, ensuring the destruction of weed vegetation by 88%, with the variation in the range of 84–93%. The economic efficiency of the combined weed control method was 16–28% depending on the year, which was also higher than that of the chemical weed control method (5–10%).

Keywords: weeds; potato protection; herbicide application on potato crop; efficiency of weed control methods.

Author Details: V. V. Smuk, research fellow; А. М. Shpanev, D. Sc. (Biol.), chief research fellow (e-mail: Этот адрес электронной почты защищён от спам-ботов. У вас должен быть включен JavaScript для просмотра.).

For citation: Smuk V. V., Shpanev А. М. Efficiency of Different Ways to Protect of Potato Crops from Weeds after Perennial Grasses. Dostizheniya nauki i tekhniki APK. 2018. Vol. 32. No. 3. Pp. 83-87 (in Russ.). DOI: 10.24411/0235-2451-2018-10317.