Abstract
Goal. To improve the system of soybean crops weed control under different methods of tillage.
Methods. Field and laboratory experiment, mathematical and statistical method to assess the reliability of the obtained results.
Results. The researched species composition of weeds in soybean crops included 12 species of 7 families, with a predominance of dicotyledonous species (80.1—93.3%), regardless of the tillage method the proportion of the monocotyledonous species made up 6.7—19.9%. The following species were most common: Chenopodium album L., Amaranthus retroflexus L., Polygonum lapathifolia L., Galinsoga parviflora Cav., Echinochloa crus-galli (L.) Pal. Beauv. and Setaria glauca (L.) Pal. Beauv. The maximum weediness of soybean crops before herbicides application was observed under the moldboardless main tillage use (to a depth of 10—12 cm) and amounted to 481.5 pcs./m2, of which dicotyledonous species made up 81.7% and monocots — 18.3%. The lowest number of weeds (at the level of 254 pcs./m2) was observed under the No-till technology, the share of dicot species made up 80.1%. With the use of the moldboard tillage in soybean crops before herbicides use, the total number of weeds was 425.5 pcs./ m2, where annual dicotyledonous species predominated (93.3%). Soybean crops subject to herbicides use on the moldboard tillage variant formed a 2.49 t/ha yield, which was 50% higher than that of the weeded control variant. The use of the moldboardless tillage and No-till technology ensured productivity in the range of 2.34—2.40 t/ ha.
Conclusions. Regardless of the soil tillage method, dicotyledonous weed species occupied from 80.1 to 93.3% of the soybean crops, with the predominance of Chenopodium album L., the share of which was 66.6—77.3% and Polygonum lapathifoliа L. — 17.6—24.9%. The use of various methods of soil tillage and weed control ensures elimination of weeds at the level of 91.0—91.5% and maintaining productivity in the range of 45—50%.
Publisher
Institute of Plant Protection of NAAS
Subject
General Earth and Planetary Sciences,General Environmental Science
Reference14 articles.
1. Ivashchenko O.O., Ivashchenko O.O. (2019). Zahalna herbolohiia : monohrafiia. [General herbology: monograph]. Kyiv: Feniks. 752. https://doi.org/10.36495/ISBN978-966-136-649-6/2019.752s. (in Ukrainian).
2. Demjanová E., Macák M., Ĉaloviü I., Majerník F, Týr Štefan, Smatana Jozef. (2009). Effects of tillage systems and crop rotation on weed density, weed species composition and weed biomass in maize [Effects of tillage systems and crop rotation on weed density, weed species composition and weed biomass in maize]. Agronomy Research, 7(2), 785-792. URL: https://www.researchgate.net/ publication/288958455_Effects_of_tillage_systems_and_ crop_ rotation_ on_ weed_ density_ weed_ species_ composition_and_weed_biomass_in_maize. (in Slovakia).
3. Cheţan F., Rusu T., Cheţan, C., Urdă C., Rezi R., Şimon A., Bogdan I. (2022). Influence of Soil Tillage Systems on the Yield and Weeds Infestation in the Soybean Crop. Land. 11, 1708. https://doi.org/10.3390/land11101708
4. Tkalich Yu.I., Tsyliuryk O.I., Rudakov Yu.M., Kozechko V.I. (2021). Efektyvnist strakhovykh herbitsydiv u posivakh soi Pivnichnoho Stepu Ukrainy. [Effectiveness of insurance herbicides in soybean crops of the Northern Steppe of Ukraine]. Agrology, (4), 165‒173. https://doi:10.32819/021019. (in Ukrainian).
5. Marchenko D.I. (2020). Konkurentni vzaiemovidnosyny soi ta burianiv v ahrotsenozakh. [Competitive relationships between soybeans and weeds in agrocenoses]. Tavriiskyi naukovyi visnyk, (114), 84-90. https://doi.org/10.32851/2226-0099.2020.114.12. (in Ukrainian).