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The purpose of this project is to examine the application of sulfur bentonite fertilizer formulations throughout the agricultural lands of Iran. Results of the preliminary research project showed that sulfur formulations made in Khangiran gas refineries could potentially increase the yield of important and strategic crops in Iran. These formulations can be used for the same locations.In order to generalize the findings to the whole of Iran, the sulfur formulation prepared in the Hashemi-Nejhad gas refinery was provided to the Soil and Water Institute. The sulfur formulation was used in research fields over a three-year span of time to evaluate its effect on soil pH and the quantitative and qualitative performance of products.The soil reaction to sulfur was then investigated. The effects of sulfur application on soil properties and crops, including pH, nutrient uptake, and yield changes in corn and wheat rotation, were studied.Finally, the results of the study were analyzed and a computer model was proposed to recommend a fertilizer suitable for different climates. A range of 1000-750 kg of sulfur is recommended for onions. Also, the amount of sulfur between 750 and 1000 kg per hectare is recommended to achieve the maximum yield of rapeseed and for achieve the maximum yield of corn crop, consumption of 750 kg per hectare is recommended. In general, for wheat, 750 to 1000 kg of sulfur per hectare is recommended.Keywords: Sulfur-bentonite, Thiobacillus bacteria, soil pH correction, sulfur oxidation, Nutrient elements
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