Published in Scientific Papers. Series A. Agronomy, Vol. LXVIII, Issue 2
Written by Mihaela METODIEVA
In 2023-2024 in the experimental field of the Agricultural University-Plovdiv, weed associations in different BBCH stages of Sorghum bicolor L. were established. The crop was grown by igrowth® technology under non-irrigated conditions. The highest weed density from the late-spring group were Amaranthus retroflexus L., Chenopodium album L., Solanum nigrum L., Setaria viridis L., Portulaca oleracea L., and from perennial group - Sorghum halepense L. and Convolvulus arvensis L. In the control plot, during BBCH 14-15 stage of S. bicolor, the heights of the species Chenopodium album L. and Amaranthus retroflexus L. exceed the crop by 7.3 cm and 1.55 cm in 2023, but in 2024 the trend was the opposite. In BBCH 50, in both years, the two species were taller by 13.2 cm to 14.7 cm compare to S. bicolor. Sorghum halepense L. dominated with its height in both growing stages for the study period. The herbicide Pulsar 40 (imazamox), applied at rates of 1.20, 2.40 and 4.80 L ha-1, controlled the weeds up to BBCH 50 of the crop by 15% to 100%, depending on the species density
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