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How to use organic, chemical and biological fertilizers in order to achieve the best fertilization management in agricultural systems is one of the questions that require field level experiments to answer. Based on this, the economic evaluation of the combined use of organic, chemical and biological fertilizers in different crop rotations was put on the agenda. The information of this project was collected using five-year test data in the agricultural research stations of Fars, Alborz, Khuzestan and East Azarbaijan provinces and also by referring to Jihad-e-Keshavarzi organization of these provinces. In this study, the economic evaluation of 13 fertilizer treatments including the use of chemical, organic and biological fertilizers alone and in combination in the dominant crop rotation of each region using partial budgeting, benefit-cost ratio, final analysis of the benefit cost ratio and net present value techniques. The results showed that the use of chemical fertilizers is completely justified from the economic point of view, but the simultaneous use of chemical and biological fertilizers has relative superiority over the use of chemical fertilizers alone. In addition, based on the results of the study, in order to improve the condition of soil organic matter, the gradual use of organic fertilizers should be put on the agenda, along with the use of biological fertilizers and chemical fertilizers. In this context, if the government seeks to accelerate the improvement of soil organic matter, it is necessary to provide a part of the cost of organic fertilizers in the form of a subsidy. It should be noted that based on the results of the study, from the economic point of view, animal manure is preferable to waste compost due to its lower cost.
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