Published in Scientific Papers. Series A. Agronomy, Vol. LXII, Issue 1
Written by Grozi DELCHEV
The research was conducted during 2012 - 2014. Under investigation was cycloxydim tolerant maize hybrid Ultrafox duo (Zea mays L.). Factor A included no treated check and 3 soil-applied herbicides - Adengo 465 SC, Wing P and Lumax 538 SC. Factor В included no treated check and 5 foliar-applied herbicides - Stellar 210 SL, Principal plus, Ventum WG, Monsun active and Laudis OD. In addition to these variants by conventional technology for maize growing, in the experience is included one variant by Duo system technology. It includes soil-applied herbicide Merlin flex 480 SC and tank mixture of antigraminaceous herbicide Focus ultra + antibroadleaved herbicide Kalam. Combinations between soil-applied herbicides Adengo, Wing and Lumax and vegetation-applied herbicides Stellar, Principal plus, Ventum, Monsun active and Laudis by conventional technology, have very high efficacy against annual graminaceous weeds and against Sorghum halepense Pers. from seeds and rhizomes, medium efficacy against Agropyrum repens L. and not efficacy against Cynodon dactylon Pers. Herbicide combination between soil-applied herbicide Merlin flex and tank herbicide mixture Focus ultra + Kalam by Duo system technology have very high efficacy against perennial weeds Cynodon dactylon Pers. and Agropyrum repens L. Herbicide Wing is inefficacy against of ClearField and ExpressSun sunflower self-sown plants in maize crops. Herbicide combination of soilapplied herbicide Merlin flex with tank mixture Focus ultra + Kalam by Duo system technology lead to obtaining of high grain yield. High yields of maize grain also are obtained by herbicide combinations Lumax + Principal plus, Lumax + Laudis and Wing + Principal plus. Alone application of herbicides leads to lower yields due to must to combine soil-applied with foliar-applied herbicides for full control of weeds in maize crops.
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