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Öğe The critical period of weed control in double-cropped soybean(Springer, 2006) Arslan, M; Uremis, I; Uludag, ADouble-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.Öğe Effects of crop rotation systems on the relationship between seed bank and weed flora(European Weed Research Soc, 2002) Uremis, I; Uygur, FN[Abstract Not Available]Öğe Relations between seedbank and weed flora in cotton areas(Eugen Ulmer Gmbh Co, 2004) Uludag, A; Uremis, I; Aksoy, E; Gonen, O; Kadioglu, IThe soil seedbank density is an approach to understand weed biology and to develop suitable integrated weed management tactics. Seedbank at cotton-wheat cropping system in the Cukurova Region of Turkey was studied. In total 30 fields were examined for the composition and density of the soil seedbank during three years. In this paper relation between weed flora and weed seedbank was compared for 5, 10 and 25 cm soil depths. There was a correlation of the seed number from different depths at all three years. The number of weed species was closer among species. But, the number of seeds and species in the seedbank were greatly varied among fields. Almost in all fields more weed species were detected above-ground than in the soil seedbank for all sampling depths. Portulaca oleracea or Amaranthus spp. were the most abundant species in the soil seedbank in all depths except in a few fields. The mean recruitment ratio from the seedbank varied. Sampling depth of 10 cm can be used for seedbank studies.Öğe Studies on different herbicide application methods in second-crop maize fields(Elsevier Sci Ltd, 2004) Uremis, I; Bayat, A; Uludag, A; Bozdogan, N; Aksoy, E; Soysal, A; Gonen, OOverall application of herbicides with hollow cone nozzles is common practice in second-crop maize in the Cukurova Region of Turkey. Effective integrated weed management tactics are needed for this region. Acetochlor and nicosulfuron, two commonly used herbicides in maize production, were applied pre-emergence and post-emergence, respectively. Spinning disc nozzles with a reduced spray volume did not improve weed control and with a reduced herbicide dose gave inadequate weed control. Banding was as effective as broadcast application. Different bandwidths with even flat fan nozzles, 15, 20, 25, 30, and 35cm, gave similar weed control and maize yield. Banding decreased herbicide and water use by up to 78%. (C) 2004 Elsevier Ltd. All rights reserved.
