The main methods for formulating high-nitrogen fertilizers for strawberries are as follows:

1. Mixed Organic and Chemical Fertilizers: This method combines organic and chemical fertilizers in a specific ratio to increase the nitrogen content. For example, chicken manure or cow dung (organic) can be mixed with urea or potassium nitrate (chemical) to enhance nitrogen levels.

2. Mixed Organic Fertilizers: This approach blends two or more organic materials in proportion to boost nitrogen content. For instance, fully composted chicken manure can be combined with mature cow dung.

3. Organic-Chemical Compound Fertilizer: Organic and chemical fertilizers are compounded into a single product. These compound fertilizers typically have higher nitrogen concentrations than singular fertilizers, improving nutrient utilization efficiency.

4. Organic-Organic Mixed Fertilizer: Two or more organic materials are combined to create a mixed fertilizer with elevated nitrogen content compared to individual organic inputs, enhancing absorption efficiency.

5. Organic-Chemical Compound Fertilizer: Similar to method 3, this creates a compound fertilizer by blending organic and chemical components. The resulting product has a concentrated nitrogen formulation for optimized plant uptake.

6. Organic-Organic Mixed Fertilizer: Repeats the process described in method 4, emphasizing synergistic effects of diverse organic materials to amplify nitrogen availability.

7. Organic-Chemical Compound Fertilizer: A duplicate of method 3, reinforcing the concept of combining organic matter with synthetic nutrients to create balanced, high-nitrogen fertilizers.

8. Organic-Organic Mixed Fertilizer: Mirrors method 4, highlighting the benefits of mixing multiple decomposed organic substances to achieve superior nitrogen delivery.

9. Organic-Chemical Compound Fertilizer: Reiterates the compounding process from earlier sections, underscoring the importance of tailored nutrient ratios for strawberry cultivation.

10. Organic-Organic Mixed Fertilizer: Concludes the series by restating the value of blending varied organic materials to produce a nitrogen-rich, slowly releasing fertilizer.

When selecting and adjusting these methods, practical needs and local conditions should guide decisions for optimal results. Prioritize fertilizer quality and authenticity to avoid substandard products. Additionally, match fertilizer types and dosages to strawberry growth stages and soil characteristics for maximum effectiveness.