SK 200 - Soil Fertility Kit Equally suitable for use in the field, farm or laboratory. This kit allows routine analysis of agricultural soil and assessment of soil fertility. Tests included are pH, lime requirement, nitrate, phosphate and potassium. Simple rapid analysis is achieved with extraction and reagent tablets provided for each of the tests. The kit is supplied in a soft shoulder carrying case and contains sufficient extraction and reagent tablets for 50 of each of the tests.