Abstract
This scientific article provides data on the effectiveness of successive application of herbicides against annual and perennial weeds in cotton fields on arable lands plowed with simple and two-sided plows. When the herbicide Samurai (1.5 l/ha) is applied separately, the annual weeds are effectively lost (86.8-90.2%), and have a weak effect on perennials. When Zellek Super (1.0 l/ha) herbicide is used separately, it has a weak effect on annuals (24.0-32.0%), effectively reducing weeds. Both perennial weeds (90.5-93.0%) and perennial weeds are effective when applied in series with Samurai (1.5 l/ha) and Zellek Super (1.0 l/ha) herbicides 88.9 -93.3% loss. Cotton yield will increase by 1.8-5.4 q/ha compared to the control option. Consecutive application of Samurai (1.5 l/ha) and Samurai (1.5 l/ha) and Zellek Super (1.0 l/ha) herbicides against annual and perennial weeds is recommended.
Highlights
Today, cotton is grown on 33 million hectares in 84 countries around the world, with an annual yield of about 25 million tons
In the field experiment (2017-2020), the number of annual weeds in the control option in the first accounting period on a simple plowed field was 31.9 pieces/m2 in 3 years, while in the options using herbicides their number was significantly reduced compared to the control option
When applied Samurai 33% preparations 1.0, annual weeds when applied at the rates of 1.5 and 2.0 l/ha are 82.8, respectively; decreased by 85.7 and 87.1%, respectively, with the Samurai 33% (1.5 l/ha) and the Zellek Super 10.4% (1.0 l/ha) used sequentially, the figure being 89.8% (Table 2)
Summary
Cotton is grown on 33 million hectares in 84 countries around the world, with an annual yield of about 25 million tons. More than 3,000 species of weeds are prevalent in world agriculture, and 1,800 of them cause enormous economic damage, of which more than 200 species are in strong competition with major agricultural crops [1,2,3,4,5]. As a result of a combination of agro-technical and chemical control measures against them, high results are being achieved in the United States, Brazil, Australia, China, India, Pakistan, Germany, South Korea, Russia and a number of other countries [2, 4, 6,7,8,9,10]. Improving the phytosanitary condition of cotton fields by agro-technical measures alone is not always possible [12, 17-21]
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