A popular test Kit for extracting and testing soil nitrogen, phosphorus and potassium. Developed by LaMotte, this Soil provides materials to extract nutrients from soil samples and perform tests for each: soil nitrogen, soil phosphorus and soil potassium. Kit includes tablets of nitrate, phosphorus, potassium and Floc Ex; a graduated extraction tube; pipet; water-resistant color chart for interpreting the results of colorimetric tests; and a turbidity chart for the turbidimetric test. Illustrated step-by-step instructions.