tailieunhanh - Critical period of weed control in chickpea under non-irrigated conditions

The present study was conducted during the growing seasons of 2005, 2006, and 2007 to determine the critical period of weed control (CPWC) in chickpea (cv. Aziziye 94). | I. TEPE, M. ERMAN, R. YERGİN, B. BÜKÜN Research Article Turk J Agric For 35 (2011) 525-534 © TÜBİTAK doi: Critical period of weed control in chickpea under non-irrigated conditions Işık TEPE1,*, Murat ERMAN2, Reyyan YERGİN1, Bekir BÜKÜN3 1 Yüzüncü Yıl University, Faculty of Agriculture, Department of Plant Protection, 65080, Van - TURKEY 2 Yüzüncü Yıl University, Faculty of Agriculture, Department of Field Crops, 65080, Van - TURKEY 3 Harran University, Faculty of Agriculture, Department of Plant Protection, 63300, Şanlıurfa - TURKEY Received: Abstract: The present study was conducted during the growing seasons of 2005, 2006, and 2007 to determine the critical period of weed control (CPWC) in chickpea (cv. Aziziye 94). In order to evaluate the beginning of CPWC, weeds were allowed to compete at weekly intervals for 1 to 8 weeks after emergence (WAE) and, at the end of CPWC, plots were kept weed-free at weekly intervals for 1 to 8 WAE by periodic hand hoeing. The beginning and the end of CPWC were based on 5% acceptable yield loss (AYL) levels, which were determined by fitting logistic and Gompertz equations to relative yield data, representing increasing duration of weed-interference and weed-free period, estimated as growing degree days (GDDs). The major weed species were Centaurea depressa Bieb. and Bromus tectorum L. for the 1st year, Salsola ruthenica Iljin., Amaranthus sp. and Heliotropium europaeum L. for the 2nd year and Amaranthus spp., Salsola ruthenica Iljin., Sisymbrium septulatum DC. and Heliotropium europaeum L. for the 3rd year. Overall weed density was 190 plants m-2 in 2005, 215 plants m-2 in 2006, and 191 plants m-2 in 2007. Yield losses were in 2005, in 2006, and in 2007 when the crop was not weeded. It was found that at the 5% AYL level CPWC was WAE to harvest in the 1st year, from emergence to harvest in the 2nd year, and from WAE to harvest in the 3rd year. The present .

• Nông nghiệp
• Critical period
• Weed competition
• weeks After emergence
• Acceptable yield loss
• Growing degree days
• Biological yield
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• Weed interference
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