4R Plant Nutrition Manual: A Manual for Improving the Management of Plant Nutrition (Metric Version)

4R Nutrient Stewardship is a new innovative approach for fertilizer best management practices adopted by the world's fertilizer industry. This approach considers economic, social, and environmental dimensions of nutrient management and is essential to sustainability of agricultural systems. The concept is simple–apply the right source of nutrient, at the right rate, at the right time, and in the right place–but the implementation is knowledge-intensive and site-specific.
The 4R Plant Nutrition Manual includes chapters on the scientific principles behind each of the four R’s or “rights”. It discusses adoption of 4R practices on the farm, approach¬es to nutrient management planning, and measurement of sustainability performance. Both a metric version and a North American/Imperial units version are available.