برهمکنش پساب تصفیه شده شهری و نیتروژن بر ویژگی‌های شیمیایی خاک در کشت ذرت شیرین

Effect of urban sewage and nitrogen on soil chemical characteristics in sweet corn was evaluated in Yasouj region at 2009. Five irrigation treatments were managed common water during entire period of growing season as control (I1) urban sewage during the first half of growing season (I2) urban sewage during the second half of growing season (I3) alternate urban sewage and common water (I4) and urban sewage during entire period of growing season (I5) and three nitrogen rates (N0=0, N80= 80 and N160=160 kg N ha-1) in a completely randomized design with three replications. Results indicated that the soil N, P and K concentrations in treatment I5 had a significant difference compared to the other irrigation treatments. Irrigation levels were also exhibited a significant difference in soil organic matter and EC. Maximum and minimum of soil organic matter were observed in I5 (%0.45) and in I1 (%0.33), respectively. Maximum and minimum of soil EC were found in I5 (2.0 dsm-1) and in I1 (1.4 dsm-1), respectively. Irrigation treatments did not show a significant change in soil pH. The effect of irrigation and interaction between irrigation treatments and nitrogen rates were not significant on available forms of Fe, Zn, Cu and Mn in soil. The effect of nitrogen fertilizer was significant on soil N content. Maximum (%0.034) and minimum (%0.030) of soil nitrogen were noticed in N160 and N0, respectively.