The Nutrient module for farmOS provides the ability to store nutrient management plans in farmOS. You can link it to specific areas, and upload your planning documents, spreadsheets, and other files for easy reference. A Nutrient Management dashboard is also provided, with quick links for managing soil tests, nutrient management plans, and soil amendment records.
In the future, more nutrient management planning features may be built in this module, including integrated calculations and input recommendations. See the module's GitHub project page to suggest features or take part in the development.