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Articles by Ilhan Uremis
Total Records ( 6 ) for Ilhan Uremis
  Mehmet Arslan , Ilhan Uremis and Ahmet Uludag
  Maintaining weed-free period longer than required for optimum seed yield increases cost of crop production. A two-year study was conducted to determine the critical weed-free period for double-cropped soybean to obtain maximum seed yield. The experimental design was Randomized Complete Blocks with three replications. Seed yield varied between 1289.3 and 4778.3 kg ha-1 in 2002 and between 1007.3 and 3980.0 kg ha-1 in 2003. The highest and the lowest seed yield were obtained from weed-free and weedy control treatments, respectively in both years. Seed yield exponentially increased with the increasing weed-free period in 2002 and 2003. Seed yield increase in increased period of weed-free plots was resulted from increased pod and seed number/plant. The result of present study showed that double-cropped soybean must be kept weed-free from emergence till physiological maturity to obtain maximum seed yield.
  Ilhan Uremis , Mehmet Arslan and Ahmet Uludag
  The objectives of this study were to determine the effects of weed infestation on seed yield and yield components of double-cropped soybean and to determine critical time of weed removal after emerging that double-cropped soybean can tolerate before yields are reduced. Eleven weed duration periods were created by removing weeds by weekly intervals after emergence. Plants grown in different weed duration plots were examined and compared with weedy and weed-free controls. The experimental design was Randomized Complete Blocks with three replications. Plants grown in weedy control plots had taller plant heights than weed-free control and the other weedy plots. Branch number, node number, pod number and seed number per plant decreased when the duration of weed infestation increased. Maximum soybean seed yield was obtained when plots were kept weed-free, followed by weedy 1 Week After Emerging (WAE). In weedy control plots, seed yield was reduced. The result of present study showed that 1-week delay in removing of weeds significantly reduces seed yield in double-cropped soybean.
  Mehmet Arslan , Ilhan Uremis and Ahmet Uludag
  A laboratory study was conducted to determine bio-herbicidal potential of fresh shoot and root extracts of rapeseed (Brassica napus L. ssp. oleifera DC.) cv Westar, round white radish (Raphanus sativus L.), garden radish (Raphanus sativus L.), black radish (Raphanus sativus L. var. niger), little radish (Raphanus sativus L. var. radicula) and turnip (Brassica campestris L. subsp. rapa) at various concentrations (20, 40 and 80 mL L-1) on cutleaf ground-cherry (Physalis angulata L.) seed germination. The experimental design was a Randomized Complete Block in a split plot arrangement with three replications. Fresh shoot and root extracts of Brassica species had different levels of germination inhibition rates. The highest germination inhibitions were obtained from rapeseed shoot extract with 58.7% and turnip root extract with 54.3%. Inhibitory effects of fresh shoot and root extracts increased with the increasing rate of extract concentrations.
  Ilhan Uremis , Mehmet Arslan and Ahmet Uludag
  The objective of the current study was to determine the allelopathic potential of six Brassica species widely cultivated in Turkey which are round white radish (Raphanus sativus L.), garden radish (Raphanus sativus L.), black radish (Raphanus sativus L. var. niger), little radish (Raphanus sativus L. var. radicula), turnip (Brassica campestris L. ssp. rapa) and rapeseed (Brassica napus L. ssp. oleifera DC.) cultivar Westar on the germination and seedling growth of cutleaf ground-cherry using shoot powder extracts. Allelopathic effects of shoot powder extracts of six Brassica species at various concentrations (2, 4 and 8%) on cutleaf ground-cherry (Physalis angulata L.) were investigated under laboratory conditions. There were differences among Brassica species for allelopathic inhibition of cutleaf ground-cherry seed germination and seedling growth. Shoot powder extracts of Brassica species exhibited marked differences in the inhibition of cutleaf ground-cherry seed germination. Inhibition on seedling growth was not as much as inhibition on germination. The inhibitory effects of shoot powder extracts on cutleaf ground-cherry seed germination and seedling growth increased as their concentrations increased. These results imply that Brassica species have great potential for cutleaf ground-cherry control. However, more research is needed under field conditions to investigate allelopathic potential and practical applications.
  Erdal Sertkaya , Ilhan Uremis and Abdurrahman Yigit
  Mesquit, Prosopis farcta (Banks and Sol.) Macbride, has become a serious weed problem in cultivated and non-cultivated areas in the Mediterranean and Southeast Anatolian Regions of Turkey. Caryedon palaestinicus Southgate (Coleoptera, Bruchidae; Pachymerinae), a seed feeding insect, has been determined in mesquit growing areas. In this study, C. palaestinicus infected seed rates of P. farcta were investigated. A thousand pods of P. farcta were collected separately from Antakya, Hassa and Kirikhan districts in 2000 and Altinozu, Kumlu and Reyhanli districts in 2001. Collected pods were placed individually: polyethylene bags and kept to the following July. Numbers of damaged seeds and healthy ones were recorded in July. Damaged seed rates for Antakya, Hassa and Kirikhan were 35.4, 34.9, 37.8%, respectively and for Altinozu, Kumlu and Reyhanli were 27.9, 37.2 and 38.0%, respectively. In addition Rhaconatus major Tobias (Hymoneptera, Braconidae) a larval parasitoid of C. palaestinicus was determined in the survey areas. It is concluded that C. palaestinicus was not a promising biological agent for controlling mesquit under field conditions.
  Ilhan Uremis
  Olive is native plant of the Hatay province of Turkey. Fifty-one olive groves surveyed twice during 2003-2004 growing season. Ninety-two weed species were determined, which belong to 29 plant families. One third of species was from two families of class Monocotyledoneae and the others were from class Dicotyledoneae. Most common families were Poaceae, Asteraceae and Fabaceae. Glycyrrhiza glabra L., Sorghum halepense (L.) Pers. and Convolvulus arvensis L. were the most dense species. G. glabra L. (81.6%), S. halepense (L.) Pers. (81.4%), Portulaca oleracea L. (76.1%), Prosopis farcta (Banks. and Sol.) Macbride (69.7%) and C. arvensis L. (68.8%) were the most common weeds.
 
 
 
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