Browsing by Author "Valaie, Niusha"
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Item Chemical control of downy brome, littleseed canarygrass and green foxtail in rapeseed in southern ıran(Uludağ Üniversitesi, 2012) Valaie, Niusha; Kazemeini, Seyed Abdolreza; Hamzehzarghani, HabiballahIn order to investigate the effect of herbicide and choice of adjuvant on three grass weed species; downy brome (Bromus tectorum), littleseed canarygrass (Phalaris minor) and green foxtail (Setaria viridis); a greenhouse study was conducted in a factorial experiment laid out in randomized complete block design. Treatments included herbicide at five levels (propaquizafop, fluazifop-p-butyl, cycloxydim, sethoxydim and quizalofop-p-ethyl) each applied at two concentrations and either with/without adjuvant (volck or citoweet). The performance of herbicides and adjuvants was evaluated by rating the effect of treatment on an ordinal scale in each experimental unit at 10 and 20 days after planting (DAP). The results showed that herbicide efficiency rating distributions were significantly different between two times (10 and 20 DPA). Application of quizalofop-p-ethyl and propaquizafop were recorded as the best herbicide treatments in controlling the weeds used in this study 10DAP, however the difference between herbicides faded at 20 DAP. Also, no significant effect was found for concentration of herbicides and type of adjuvant. In addition, 30 days after herbicide application, maximum dry weight and leaf area of canola was recorded for cycloxydim, propaquizafop and quizalofop-pethyl, respectively whereas minimum dry weight and leaf area of canola was observed in pots sprayed with sethoxydim and fluazifop-p-butyl respectively.Item Interrelationships between nitrogen rate and wild oat density on oilseed rape yield components(Uludağ Üniversitesi, 2016-10-07) Karimi, Hadis; Kazemeini, Seyed Abdolreza; Valaie, NiushaIn order to evaluate the effect of nitrogen on oilseed rape yield and yield component under wild oat densities, a field experiment was conducted in Shiraz University, Iran, during 2008-2009 and 2009-2010 growing seasons. The experimental design was split plot with three replications. Treatments included four nitrogen levels (zero, 50, 100, and 150 kg ha-1 ) and four densities of wild oat (zero, 15, 30, and 45 plants m 2 ). The result showed that number of pods per main stem and secondary branches, number of seeds per main and secondary pods, 1000-seed weight, grain and biological yield was significantly increased by enhancement of nitrogen levels from zero to 150 kg ha-1 at weed-free treatments. Also, weed interference significantly reduced grain yield up to 41% under 50 and 100 kg ha-1 nitrogen application in comparison 150 kg ha-1 . Regardless of oilseed rape yield, weed dry weight was significantly increased with increasing the nitrogen levels, suggesting that high levels of nitrogen favor the crop over the weeds. This experiment suggested that oilseed rape grain and biological yield was affected more by high nitrogen levels at maximum weed density.