Download the Catalog of educational materials from the International Plant Nutrition Institute. The catalog is complete with order forms and instructions on ordering from IPNI.
Understanding and Managing N-P-K for Organic Crop Production
A series of three articles reprinted from Better Crops with Plant Food. The articles cover the behavior of some of the commonly used sources of nitrogen, phosphorus and potassium for organic crop production.Visit Store
Understanding the Major Nutrients
These three booklets were created to develop an understanding and knowledge of nitrogen, phosphorus, and potassium and their vital role in our environment and crop production. The 24-page full color illustrated booklets can be used separately or together for a complete unit on the three major plant nutrients.Read NowVisit Store