You probably already knew the 3 R's—reading, 'riting and 'rithmatic.

Groups representing fertilizer manufacturers want to introduce you to the 4R's concept of nutrient stewardship through a new website,

The 4R's involve the right fertilizer source at the right rate, the right time and the right place.

The website is intended to serve as an information clearhing house for 4R-related tools and resources.

The 4R nutrient stewardship concept and website are a cooperative effort of Washington, D.C.-based Fertilizer Institute, the Norcross, Ga.-based International Plant Nutrition Institute, the Ottawa, Ontario-based Canadian Fertilizer Institute and the Paris, France-based International Fertilizer Industry Association.