The specific contribution of organic fertilizer equipment to agricultural economic benefits can be evaluated through the following aspects:

1. Improve crop yield and quality: Organic fertilizer can provide rich organic matter and nutrient elements, improve soil structure, improve soil water retention and permeability, thus promoting crop growth, improve crop yield and quality. The economic benefits can be assessed by comparing the yield and quality of crops using organic fertilizers with conventional fertilizers.

2. Increase soil fertility: Long-term application of organic fertilizer can increase the content of organic matter in the soil, improve soil fertility, reduce the future dependence on chemical fertilizers, and have long-term economic benefits.

3. Environmental protection: The use of organic fertilizer equipment helps to reduce the environmental discharge of agricultural waste and reduce the pollution of water and soil caused by excessive use of fertilizer, which has important environmental value and indirect economic benefits.

4. Market demand and product prices: As consumer demand for healthy food and environmentally friendly products increases, agricultural products grown with organic fertilizers can often be sold at higher prices, thus increasing farmers' incomes.

5. Technological progress and innovation: the technological progress and innovation of organic fertilizer production line can improve production efficiency, reduce production costs, and improve the market competitiveness of organic fertilizer.

6. Comprehensive evaluation method: Economic evaluation methods such as partial budget law and investment analysis can be adopted, combined with actual production data and technical parameters, to conduct a comprehensive evaluation of the economic contribution of organic fertilizer equipment.