This combination soil analysis outfits offers the finest visual color matching system available to today's agronomist. Technically advanced reagent systems and unique extraction procedures based on Mehlich I extraction that provides fast, simple and extremely accurate soil testing. Soil pH is determined colorimetrically, using a series of pH indicators and color charts covering the range of pH 3.8 to 9.6. The STH outfits include simplified procedures for screening nitrates, phosphorus, and potassium in plant tissues. Each kit includes complete instructions, a soil management handbook and a pad of soil analysis report forms. The LaMotte Soil Handbook contains general information on interpretation of test results for determination of lime and fertilizer requirements. Tests include pH, Nitrate Nitrogen, Phosphorus, Humus (Organic Matter), Calcium, Magnesium, Ammonia Nitrogen, Manganese, Aluminum, Nitrite Nitrogen, Sulfate, Chloride, Ferric Iron, and Potassium; 50/100 tests. Use for soil applications.