effects of different amounts of sulfur and manure on soil acidity and plant traits of corn hybrid ksc 704

in order to effects of sulfur and manure on grain yield, yield components, and some physiological traits of corn hybrid ksc 704 in calcareous soils of kermanshah province, a factorial experiment was carried out based on a randomized complete block design with three replications. sulfur fertilizer in four levels 0, 250, 500 and 750 kg ha-1 and manure in four levels 0, 4, 8 and 12 t ha-1 were applied. results showed that the effects of sulfur fertilizer, manure and their interaction effects was significant at the 1% probability level for grain yield, stem diameter, number of rows per ear, number of grain per row, leaf area index at 7-9 leaf and tasselling stages and, soil ph. the effects of sulfur fertilizer and manure was significant at 1% probability level only for rate and duration of grain filing, thousand seed weight and ear number per plant. maximum corn grain yield to a3b3, a3b2, a3b1 treatment combinations by12673, 12597 and 12147kg ha-1,respectively. the lowest in soil acidity was belong to a3b3 treatment combination with7.51 . in general application of 750 kg ha-1 sulfur fertilizer and 8 or 12 t ha-1 manure cause the maximum means for yield and components grain yield of corn. therefore it can be possible to decrease the negative effects of calcareous soils along with application of 750 kg ha-1 sulfur fertilizer and 12 t ha-1 manure.