Arslan, MUremis, IUludag, A2024-09-182024-09-1820060334-21231876-7184https://doi.org/10.1007/BF02981316https://hdl.handle.net/20.500.12483/12324Double-cropped soybean after winter cereals is the most common soybean production system in the eastern Mediterranean region of Turkey. Weeds are among the main obstacles to double-cropped soybean. A study was conducted in 2002 and 2003 to determine the critical period of weed control (CPWC) for double-cropped soybean. The treatments consisted of either allowing weeds to infest the crop for increasing durations after sowing, or maintaining plots weed-free for increasing durations after sowing. The Gompertz and logistic equations were fitted to relative yields representing the critical weed-free period and the critical time of weed removal, respectively. Johnsongrass (Sorghum halepense), common cocklebur (Xanthium strumarium) and field bindweed (Convolvulus arvensis) were the dominant weeds. For 5% crop loss level, the CPWC was almost all season long, whereas it was from VI to R6-R7 growth stages for 10% yield loss level. These findings indicate that pre-sowing or pre-emergence control methods should be applied in the region to avoid greater crop losses.eninfo:eu-repo/semantics/closedAccesssoybeancritical period of weed controlweed interferencetime of weed removalyield lossArticle34215916610.1007/BF029813162-s2.0-33645553120Q2WOS:000236072400007Q3