عنوان مقاله [English]
نویسنده [English]چکیده [English]
Research purpose was investigation of moisture, temperature and incubation periods effect on Sulfur oxidation, pH change and nutrient elements availability. This research was conducted with two experiments in randomized complete blocks designe with 3 replications. In the first experiment, treatments were the factorial combination of 2 moisture levels [%60FC(M1) and %90FC(M2)], 4 Sulfur levels (S0=0, S1=500, S2=1000 and S3=2000kg/ha) and 6 incubation periods (T1=30, T2=60, T3=90, T4=120, T5=180 and T6=270 days) and Soils were incubated at 25°C. In the second experiment, Soils were incubated for 3 periods (T7=14, T8=28, T9=42 days) at 36°C. PH, EC, available P, Fe, zn and Mn were measured. Variance Analysis indicated that Sulfur and its interaction with moisture effects was not significant on available P. Also moisture and incubation period interaction was not significant on available Mn. Main effects and interactions of variables were significant on all measured characteristics with except for mentioned characteristics. Moisture increasing caused increasing of EC, P, Fe, Zn and decreasing of pH and Mn. Sulfur application decreased pH and increased EC, Fe, Zn and Mn. The most concentration of Fe, Mn and Zn accrued with 1000kg/ha sulfur application. Effect of incubation periods was significant on all attributes. Incubation period of 90 days (T3) had the most P and Zn. The most concentration of Fe and Mn gained after 60 days incubation. Moisture and sulfur interaction was significant on all measured characteristics with except for Phosphorus. Moisture and incubation period interaction had significant difference on all measured attributes with the exception of Manganese. Interaction of Sulfur and incubation period was significant on all measured attributes. The tri- combined treatments had significant difference on the measured characteristics with the exception of available P. The best recommendable treatment is M2S2T3.