Eijkelkamp 18.06 Soil Test Kit For Macronutrients, Micronutrients & pH for determination of available nutrients found in agricultural soils. A series of rapid, accurate chemical tests use standardized reagents to produce color reactions measured against laminated color charts. Colorimetric test methods are used for most test factors. Some tests are based on turbidity measurements. A single extraction procedure provides the liquid soil extract for all the nutrient tests with the exception of chloride, which is extracted with demineralized water.