A good organic tomato fertilizer needs to include ingredients that are high in nitrogen, phosporous and potassium elements. One suggestion is a blend of poultry manure and high potash from sugar beet.
Nitrogen-based ingredients, such as animal manure, will encourage healthy green leaves to grow. Phosphorous is a mineral base and is found in products such as bone meal. This will encourage healthy roots, stems and fruit. Potassium elements, such as wood ash or dry seaweed, will help fight diseases and pests. Used ground coffee and grass clippings also contain extra nitrogen, which will be a nutritional supplement for the soil.