2012 Cilt 6 Sayı 16
Permanent URI for this collectionhttps://hdl.handle.net/11452/16962
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Browsing by Author "Ghadiri, Hossein"
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Item Effect of split nitrogen fertilization and herbicide application on soil weed seed bank in wheat (Triticum aestivum L.) and oilseed rape (Brassica napus L.) rotation(Uludağ Üniversitesi, 2012) Sheibani, Sahar; Ghadiri, HosseinIn order to investigate the effects of nitrogen splitting and herbicide application on soil weed seed bank in a wheat and oilseed rape rotation, a field experiment was conducted in research station of the School of Agriculture, Shiraz University, Iran in 2005-6 and 2006-7. Results suggested that at 304 kg urea ha-1 when half of it was applied through sowing stage of wheat and oilseed rape and the other half applied at tillering stage of wheat and the end of rosette stage of oilseed rape grain and biological yield enhanced substantially in wheat and oilseed rape. Presence of weeds in weedy checks plot increased biological yield 57% in wheat, 142% in oilseed rape. On the other hand, it reduced wheat grain yield 53% and oilseed rape grain yield 65% comparing with weed free plots. Results indicate that herbicides application enhanced grain yield 88% in wheat, 63% in oilseed rape. However, it decreased weeds’ dry weight 58% in wheat and 78% in oilseed rape when it compared with weedy checks plot. Furthermore, iodosulfuron–methyl– sodium plus mesosulfuron–methyl–sodium in wheat reduced the annual rising of the soil weed seed bank 53% in 0-15cm and 71% in 15-30cm depth, while haloxyfop-(R)-methylester in oilseed rape decreased it 43% in 0-15cm and 40% in 15-30cm depth.Item Weed control and grain yield response to nitrogen management and herbicides(Uludağ Üniversitesi, 2012) Najafi, Batool; Ghadiri, HosseinIn order to investigate the effect of herbicides application and nitrogen (N) levels on weed control and grain yield of corn, two field experiments were conducted in 2007 and 2008. The treatments consisted of four levels of 50, 100, 150, and 200 kg N P ha-1 as main plots and herbicides including atrazine plus alachlor at 1+2.44 and 1.92+1.5, 2, 4-D plus MCPA at 0.36+0.31 and 0.54+0.46, rimsulfuron at 0.02 and 0.04 and foramsulfuron at 0.03 and 0.06 kg a.i. P ha-1 were the sub factors. A weed-free and a weedy check were also included. The results revealed that increased levels of applied nitrogen tended to enhance the total weed biomass significantly. Foramsulfuron controlled field bindweed (Convolvulus arvensis L.) effectively in both years. Redroot pigweed (Amaranthus retroflexus L.) was satisfactorily controlled by foramsulfuron in both years. Rimsulfuron and 2,4-D plus MCPA had the highest redroot pigweed dry weight and controlled chinese-lantern-plant (Physalis alkekengii L.) less effectively compared with field bindweed and redroot pigweed. Addition of N increased the competitive ability of corn against weeds and resulted in higher grain yield. Foramsulfuron controlled weeds effectively and caused significant increase in corn grain yield between 44 and 66% higher than weedy check in both years.