I'm a bell pepper producer, and I'm striving to optimize my fertilization process. Recently, I acquired a Horiba kit to analyze NO3, K, Ca, and Na levels, but I lack a reference to determine if I am within the appropriate range.
I'm not sure exactly what you are looking for but there are authoritative tabulations of 'sufficient' foliar concentrations of elements for capsicum, eg., Handbook IV by Gretchen Bryson and Harry Mills. This text will also give you an understanding of mineral nutrition. Should you want to take that further there is an excellent text by Marschner
... some commonly used fertilizer references for bell peppers:
NPK Fertilizers: Look for a balanced NPK fertilizer with an equal or slightly higher middle number (phosphorus). For example, a fertilizer with an NPK ratio of 10-10-10 or 14-14-14 can be suitable for bell peppers.
Organic Fertilizers: Organic options for bell peppers include compost, well-rotted manure, and organic fertilizers specifically formulated for vegetables. These provide a slow release of nutrients and improve soil health.
Slow-Release Fertilizers: Slow-release fertilizers, such as coated or granular fertilizers, can provide a steady supply of nutrients over an extended period. They are convenient and reduce the risk of nutrient leaching.
Liquid Fertilizers: Liquid fertilizers, both synthetic and organic, can be applied through foliar sprays or in the irrigation water. They provide a quick uptake of nutrients and can be used as a supplemental source of nutrition.
Controlled-Release Fertilizers: Controlled-release fertilizers are specially formulated to release nutrients gradually based on temperature and moisture conditions. These can provide long-term nutrient supply for bell peppers.
Micronutrient Fertilizers: Bell peppers may require additional micronutrients such as iron, zinc, manganese, and boron. Micronutrient fertilizers or foliar sprays designed for vegetable crops can address these specific nutrient needs.
When selecting fertilizers, consider factors such as the growth stage of the bell peppers, and any nutrient deficiencies or imbalances observed. Always follow the instructions on the fertilizer package regarding application rates, timing, and methods but it's recommended to consult with local agricultural extension services, horticultural experts, or experienced farmers in your specific region for fertilizer recommendations tailored to your local conditions and practices.
The best pepper plant fertilizer depends on soil condition and the top performer is Pepper & Herb Fertilizer 15-10-10, Plus Micro Nutrients. This fertilizer is formulated to provide a balanced ratio of nutrients essential for pepper plants. Heavy nitrogen fertilizers are preferred during the plant's growth stage to encourage solid stems and leafy growth. Still, high nitrogen fertilizers should be reduced for a higher phosphorus fertilizer before the plants begin to flower