Effectiveness of herbicides mixtures applied according to diversified weed community in maize cultivation

Goebiowska, H.

Pestycydy (1/2): 49-57

2006


Accession: 012911384

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Abstract
Field experiments were conducted at 4 sites in Poland, on different soil types, from 2002 to 2004, to identify the state of infestation and abundance of weeds and the competition effect of these weeds on maize cv. Marignan crops. Results showed that weed communities with Geranium pusillum and Fumaria officinalis as the dominant species, were controlled with different herbicides on brown soil. The best economical justification featured the application of MaisTer 310 WG (iodosulfuron methyl), which resulted in the increase in grain yield by 153.8%, and low costs of application at the same time. On podsolic soils, weed communities with Centaurea cyanus and Anthemis arvensis, was observed. The herbicides used considerably limited weed infestation, although the best weed control effect and significantly high grain yield (112.13 dt/ha) was obtained after application of the following mixture: Mustang 306 SE (2,4-D + florasulam) + Titus 25 WG (rimsulfuron) + Trend 90 EC. Due to the appropriately chosen herbicide mixtures, it was possible to achieve the best economic effect, i.e. 93.9% increase in yield. Weed communities with Chenopodium album and Amaranthus retroflexus were best controlled with the mixture of Milagro 040 SC (nicosulfuron) + Callisto 100 SC (mesotrione) on black soil. In Wrocaw black soil fields, mass occurrence of Echinochloa crus-galli were recorded. The most satisfactory herbicidal effect was obtained with application of Milagro 040 SC in combination with Gesaprim 90 WG (atrazine), as it contributed to a higher seed yield of Marignan (124.35 dt/ha) and cost reduction, which, eventually, resulted in the increase in yield by 212.72%. The herbicides subjected to investigation in field experiments conducted on different soil types were applied at the same time, but their effect in the particular years was connected with different weather conditions. Knowledge of the weed community structure and soil types are important components of weed management.