A good resource on NMPs… click here for CURES website!
Fertility management guidance via Fertilizer Research and Education Program (FREP)
These guidelines are based on research results from studies carried out in California and elsewhere. Detailed information is summarized in a user-friendly, easily searched interactive database. Information for cotton, wheat, corn, rice, walnuts, grapevines, lettuce, almonds, processing tomatoes, alfalfa, strawberries, cauliflower and broccoli is available. Crops continue to be added.
University of California Resources – UC Nutrient Management for Fruit, Nut & Vegetable Crops
Search by crop or by topic for information. Links to UC publications with nutrient management guidance prepared by UC Farm Advisors and Researchers.
USDA Tool to Calculate Nutrient (N, P, K) Removal by Harvested Crop
This Crop Nutrient Tool has information about N, P, and sometimes K of crop residues. Need to input yield and know what the harvested portion is.
International Plant Nutrition Institute Crop Nutrient Removal Calculator app for iPhone or iPad
Download the FREE app from the “App Store” or “iTunes” to your iPhone or iPad. About 80 crops are available, but be aware that some are listed in components (such as sugarbeet tops and sugarbeet roots) that you would need to add together if all components are removed from the field.
IPNI Nutrient Source Specifics
Fact sheets on common synthetic fertilizer materials.