ISSN 2285-5785, ISSN CD-ROM 2285-5793, ISSN ONLINE 2285-5807, ISSN-L 2285-5785


Published in Scientific Papers. Series A. Agronomy, Vol. LXII, Issue 2
Written by Grozi DELCHEV

The research was conducted during 2012-2014. Under investigation were 4 sunflower hybrids (Helianthus annuus L.): hybrid Bacardy (an imitolerant hybrid by ClearField plus technology), hybrid Estiva (an imitolerant hybrid by ClearField technology), hybrid Sumico (a tribenuron-methyl tolerant hybrid by ExpessSun technology) and hybrid Arizona (a hybrid by conventional technology). Factor A included the years of investigation. Factor B, herbicides and tank mixtures, included 20 rates. It includes 3 variants by ClearField plus technology, 5 variants by ClearField technology, 5 variants by ExpessSun technology and 7 variants by conventional technology. Herbicide Pulsar plus by ClearField plus technology and herbicide Listego by ClearField technology, destroy completely all annual and perennial graminaceous and broadleaved weeds in sunflower crops, including Orobanche cumana Wall. Herbicide Express by ExpressSun technology, controls all perennial and annual broadleaved weeds. Tank mixture of Express with antigraminaceous herbicide Select super controlled successfully and all annual and perennial weeds. The highest seed yield is obtained at herbicide tank mixture Pulsar plus + Stomp aqua by ClearField plus technology. Tank mixture Listego + Dash + Sharpen by ClearField technology and Express + Trend + Select super by ExpressSun technology also lead to obtaining of high seed yields. Tank mixtures of herbicides Smerch, Pendigan, Wing, Raft, Pledge and Modown with Amalgerol premium by conventional technology have lower yields due to insufficient control of weeds as Xanthium strumarium L., Cirsium arvense Scop., Convolvulus arvensis L. in sunflower crops.

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