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Effect of Doses, Application Dates, Adjuvants and Zinc Sulfate on Bromoxynil + Terbuthylazine + NicosulfuronWeed Control Efficacy and Maize Grain Yield in Mid-West Poland
Influence of Application Timings, Rates, and Adjuvants on Tiencarbazone-Methyl Plus Isoxaflutole and Mesotrione with Nicosulfuron and Rimsulfuron on Weed Control and Yield of Maize
Weed control in maize is usually limited to a single herbicide treatment, but the application of two or more herbicides is associated with many benefits, e.g., increasing the spectrum of control weeds, reducing the risk of damage to crops by using reduced rates of herbicides, limiting their residues in the soil or crop, etc. This field experiment was conducted in the years 2016–2018 to determine whether the split application of soil-applied thiencarbazone-methyl + isoxaflutole and foliar-applied mesotrione + nicosulfuron + rimsulfuron, in reduced rates with adjuvants, can contribute to enhancing herbicide effectiveness and increasing maize yield. Weed control in maize in a split-dose system with a mixture of thiencarbazone-methyl + isoxaflutole at strongly reduced rates with the addition of UAN and the adjuvant Atpolan SoilMaxx or Grounded, and then mesotrione + nicosulfuron + rimsulfuron at strongly reduced rates with UAN and Atpolan SoilMaxx or Actirob 842 EC allowed for great control of weeds. The total amount of substances was slightly higher than in single treatments with adjuvants, but lower than for individual active substances, leading to a reduction in the amount of active substances reaching the environment, while maintaining very high herbicide efficacy.
Impact of chemical weed management in sugar beet (Beta vulgaris) on productivity, quality and economics
Weeds in sugar beet ( Beta vulgaris L.) can contribute to a significant reduction in the root yield. The species composition of these plants is an important factor influencing the competition with crops. The aim of the 2-year field experiment with mixtures of: phenmedipham + ethofumesate + metamitron + quinmerac; ethofumesate + metamitron + metamitron + + quinmerac + triflusulfuron-methyl; phenmedipham + ethofumesate + metamitron + + quinmerac + triflusulfuron-methyl + clopyralid + lenacil, and phenmedipham + ethofumesate + metamitron + quinmerac + triflusulfuron-methyl + clopyralid applied in split doses, microdoses and Conviso Smart technology was to determine the weed species community composition and effectiveness of weed control strategies. The most common species occurring in both years were: Chenopodium album L., Fallopia convolvulus L., and Geranium pusillum L. The communities had the highest values of biodiversity indices in 2020 and lower values in 2021. There were no statistically significant differences in the herbicidal effectiveness of the tested herbicidal technologies over both years of research and for individual main weed species – 95–99%. The use of all herbicide variants contributed to achieving significantly higher yields than untreated treatments, and contributed to an increase in profitability of cultivation, but this result depended on the selected strategy. The presented herbicide solutions were characterized by direct income at a similar level.