Combined effects of pesticides on weedines and seed yield of soybean crops
Goal. of my study was to investigate the combined effect of pesticides, including seed dressers, post-emergence herbicides, fungicides, biologicals, and plant growth regulators on weediness and soybean yield in the Eastern Forest-Steppe of Ukraine.
Methods. Field, analytical and statistical.
Results. The weeds in the soybean crops were represented by 15 species. Cockspur (Echinochloa crusgalli (L.) Roem et Schult.), yellow foxtail (Setaria glaua (L.) Beauv.), lamb’s quarters (Chenopodium album L.) and redroot pigweed (Amaranthus retroflexus L.) dominated in the soybean crops. In the controls, the dominant position in the soybean crops (in terms of the wet weight of weeds) was occupied by biennial and annual dicotyledonous weeds (56—57% of the total wet weight of weeds). Annual gramineous weeds (37—42%) and perennial dicotyledonous weeds (2—6%) ranked the second and third most spread species. Pre-sowing treatment of seeds increased the competitiveness of soybean plants against weeds. Herbicide composition Tabezon (2.0 l/ ha) + Formula (6 g/ ha) + surfactant Trend 90 (0.2 l/ ha) (primordial leaves) + Lemur (1.5 l/ ha) (biternate/ triternate leaves) significantly reduced the total number of weeds in the soybean crops by 89% and their wet weight by 97%. There was no evidence of significant effects of post-emergence combinations of herbicides with chemical or biological pesticides on the effectiveness of weed control in the soybean crops. Analyzing the soybean seed yield, I revealed that application of herbicides alone in the crops was the most justified.
Conclusions. Increased competitiveness of soybean plants against weeds on pre-sowing seed treatment has been demonstrated. There was no evidence of significant effects of post-emergence combinations of herbicides with chemical and biological pesticides on the weed control effectiveness. Monoapplication of herbicides was the most justified.
Babych A.O., Babych-Poberezhna A.A. (2011). Selektsiia, vyrobnytstvo, torhivlia i vykorystannia soi u sviti. [Breeding, production, trade and use of soybean in the world]. Kyiv: Ahrarna Nauka, 548 p. [in Ukrainian].
Kyrychenko V.V., Krasylovets Yu.H. (Ed.) (2006). Optymizatsiia intehrovanoho zakhystu polovykh kultur (dovidnyk). [Optimization of integrated protection of field crops (guide)]. Kharkiv: Mahda LTD. 251 p. [in Ukrainian].
Petrenkova V.P., Sokol T.V., Luchna I.S. (2013). Teoretychni osnovy selektsii zernobobovykh kultur na stiikist do shkidlyvykh orhanizmiv. [Theoretical principles of grain legume breeding for resistance to harmful organisms]. Kharkiv: Kolehium. 200 p. [in Ukrainian].
Perelik pestytsydiv i ahrokhimikativ, dozvolenykh do vykorystannia v Ukraini. (2016). [List of pesticides and agrochemicals approved for use in Ukraine]: special issue of the journal “Propozytsiia.” Kyiv: Univest Media OOO. 1023 p. [in Ukrainian].
Kyryliuk V.P. (2015). Produktyvnist soi zalezhno vid sposobiv zastosuvannia biofunhitsydu Mikosan. [Soybean performance depending on ways of application of biofungicide Mycosan]. Visnyk TsNZ APV Kharkivskoi Oblasti. Issue 18. P. 39–44. [in Ukrainian].
Hutianskyi R.A. (2013). Herbitsydy i bulbochky soi. [Herbicides and soybean nodules]. Farmer. No 5. P. 52–54. [in Ukrainian].
Hutianskyi R.A. (2018). Vplyv kombinatsii pisliaskhodovykh herbitsydiv z rehuliatoramy rostu roslyn i mikrodobryvom na pokaznyky vyroshchuvannia soi. [Influence of combinations of post-emergence herbicides with plant growth regulators and microfertilizers on soybean cultivation parameters]. Zbalansovane Pryrodokorystuvannia. No 1. P. 48–55. [in Ukrainian].
Dospekhov B.A. (1985). Metodika polevogo opyta. [Methods of field experimentation]. Moscow: Agropromizdat. 351 p. [in Russian].
This work is licensed under a Creative Commons Attribution 4.0 International License.