عنوان مقاله [English]
A field study was conducted to investigate the effect of wheat and sudan grass residues and different rates of nitrogen on sugar beet production using a split plot experimental design. The experiment was carried out in a salty loam soil in Khouzestan province, at Safiabad station-Dezful. The main plots consisted of Burned wheat Straw (BWS), Sudan grass Residue Incorporated in the soil after harvest (SRI), and incorporated wheat Straw in the soil (ISS). Subplots were five levels of nitrogen application rates (0,90,180,270,360)kg/ha. The root yield, sugar content, sugar yield and impurity components were determined. The root yield, sugar content and sugar yield of main plots were significantly different. The highest root yield (67.7 tons/ha) and sugar yield (6.63 tons/ha) were obtained by BWS treatment. Root yield increased, and sugar content decreased by increasing N application rates. The highest sugar yield in this experiment obtained with 360 kg nitrogen, was not significantly different from 180 kg nitrogen per hectare. Consequently, ISS treatment and 270 kg/ha N providing more organic matter and improving soil physical conditions is recommended.