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Field experiments to evaluate the split application of mesotrione + s-metolachlor, mesotrione + terbuthylazine, dicamba + prosulfuron, terbuthylazine + mesotrione + s-metolachlor, and sulcotrione in the cultivation of sorghum var. Rona 1 were carried out in 2012 and 2013. Th e fi eld tests were conducted at the fi eld experimental station in Winna Góra, Poznań, Poland. Treatments with the herbicides were performed directly aft er sowing (PE) and at leaf stage 1–2 (AE1) or at leaf stage 3–4 (AE2) of sorghum. Th e treatments were carried out in a laid randomized block design with 4 replications. Th e results showed that the tested herbicides applied at split doses were eff ective in weed control. Aft er the herbicide application weed density and weed biomass were signifi cantly reduced compared to the infested control. Th e best results were achieved aft er the application of mesotrione tank mixture with s-metolachlor and terbuthylazine. Application of split doses of herbicides was also correlated with the density, biomass, and height of sorghum.
The evaluation of effect of the grass and broadleaf weed control of different mixture rates of mesotrione plus pethoxamid and terbuthylazine applied postemergence in maize was conducted in the field experiments during the 2005 and 2006 growing seasons. There was no phytotoxicity observed on maize after herbicide treatments. Herbicide mixture provided higher levels of Echinochloa crus-galii (L.) Beauv. control than mesotrione used alone. In the postemergence trials, the broadleaf weeds, except Clienopodium album L., were not well controlled by the mesotrione-alone treatment. The addition of pethoxamid plus terbuthylazine to mesotrione significantly improved the control of broadleaf weeds. Mesotrione and mesotrione plus pethoxamid and terbuthylazine treated plots were always among the highest yielding as compared to untreated plots. Any reductions in cob and grain yield were always associated with high weed fresh matter yields indicating that it was the weed competition that led to reduced yield and not herbicide phytotoxicity.
Field experiments were conducted in 2007–2009. Possibilities of using a mixture of mezotrion + s-metolachlor + terbutylazine in sugar maize to evaluate weed control and cob yield. That controlled weeds in 98%. Herbicide Lumax 537,5 SE was selective to the sugar maize variety Naziha. Cob yield was higher in herbicide treatment as compared with control plots.
In the years 2007–2009 field experiments with maize were carried out under reduced tillage. Brown soils were boron deficient and medium affluent in available zinc. The mixture of mezotrione and rimsulfuron was applied in experiments with split dose method (½ dose at 3 leaf stage and ½ dose at 8 leaf stage) in conjunction with micronutrient fertilizers in the form of chelate boron and zinc compounds (Insol B and Insol Zn). The possibility of joint application of mezotrione and rimsulfuron mixture with Insol B and Insol Zn was stated. The high efficiency of the mixture in reducing the mono and dicotyledonous weed species was also proved. This allowed obtaining high maize grain yields, containing more boron and zinc as well as more high quality protein and starch in comparison with both variants – untreated with herbicides and untreated with the micronutrients.
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