Plant Nutrient Ratio

An expression, in the form of a ratio and usually quoted as the lowest whole figure ratio for any one nutrient. It is commonly used to distinguish the relative proportions of Nitrogen, Phosphorus and Potassium, also termed NPK within a fertiliser. A fertiliser with 10% Nitrogen; 20% Phosphorus and 10% Potassium has a Plant Nutrient Ratio of 1:2:1.