Agricultural Outfits Model STH-4, STH-5, STH-7, and STH-14 Advanced Agricultural Soil Testing Outfits
The Model STH Combination Soil Outfits have offered simplified methods for determination of available nutrients found in agricultural soils for over forty years. Since the original introduction of the STH series, based on Morgan soil test methods, reagent systems have been updated constantly with new advancements in modern chemistry. A series of rapid, accurate chemical tests use standardized regents to produce color reactions measured against laminated color charts. All STH outfits are furnished in lightweight carrying cases with components securely mounted in removable foam trays. This format provides flexibility for the in-house specialist who also want to make quick problem determinations in the field. Colormetric test methods are used for most test factors. Test for calcium, sulfate and chlorides are based on turbidity measurements. Potassium analysis also employs a turbidity measurement, using a unique reading device designed LaMotte laboratories to read directly in pounds per acre. A single extraction procedure, using Morgan Universal Extraction Solution, provides to liquid soil extract for all the nutrient tests with the exception of chloride, which is extracted with demineralized water. The Humus Screening Test, performed on a soil sample-demineralized water suspension, employs five color standards for rapid measurement of humus content of the soil. 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 also include simplified procedures for screening nitrates, phosphorus, and potassium in plan tissues. Complete reagent refill packages are available for each STH outfit.
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. Available in four models. See charts. STH - 14 Test Factor # Tests Range* pH 100 pH 3.8 - 9.6 Nitrate Nitrogen 50 10 - 150 Lbs/acre Phosphorus** 50 10 - 200 lbs/acre Potassium 50 100 - 400 lbs/acre Humus (Organic Matter) 50 L-H 1.5% - 8% Calcium 50 150 - 2800 ppm Magnesium 50 L-H 5 - 150 ppm Ammonia Nitrogen 50 L-H 5 - 150 ppm Manganese 50 L-H 4 - 40 ppm Aluminum 50 L-H 5 - 125 ppm Nitrite Nitrogen 50 1 - 50 ppm Sulfur 50 50 - 2000 ppm Chloride 50 25 - 500 ppm Ferric Iron 50 5 - 125 lbs/acre * See Electronic Labs for unit conversion factors ** For non-alkaline soils. Code 5090 Phosphorus Auxillary package recommended for alkaline soils.	STH - 4 Test Factor # Tests Range* pH 100 pH 3.8 - 9.6 Nitrate Nitrogen 50 10 - 150 Lbs/acre Phosphorus** 50 10 - 200 lbs/acre Potassium 50 100 - 400 lbs/acre STH - 5 Test Factor # Tests Range* pH 100 pH 3.8 - 9.6 Nitrate Nitrogen 50 10 - 150 Lbs/acre Phosphorus** 50 10 - 200 lbs/acre Potassium 50 100 - 400 lbs/acre Humus (Organic Matter) 50 L-H 1.5% - 8% STH - 7 Test Factor # Tests Range* pH 100 pH 3.8 - 9.6 Nitrate Nitrogen 50 10 - 150 Lbs/acre Phosphorus** 50 10 - 200 lbs/acre Potassium 50 100 - 400 lbs/acre Humus (Organic Matter) 50 L-H 1.5% - 8% Calcium 50 150 - 2800 ppm Magnesium 50 L-H 5 - 150 ppm

513201 Model STH-4, Macronutrients & pH (9#)                               $347.00
513211 Model STH-4 Reagent Refill (6#)                                     $153.00

513301 Model STH-5, Macronutrients, pH, & Humus (11#)                      $367.00
513311 Model STH-5 Reagent Refill (8#)                                     $145.00

513401 Model STH-7, Macronutrients, pH, Humus, Calcium, & Magnesium (12#)  $401.90
513411 Model STH-7 Reagent Refill (8#)                                     $183.00

513101 Model STH-14, Macronutrients, Micronutrients, & pH (15#)            $565.00
513111 Model STH-14 Reagent Refill (10#)                                   $551.00

Select Model STH-4 Reagent Refill, Model STH-4 Model STH-5 Reagent Refill, Model STH-5 Model STH-7 Reagent Refill, Model STH-7 Model STH-14 Reagent Refill, Model STH-14

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*There is a 20% restocking fee on this product.

• Model STH Product Manual in .pdf format.
• Models STH MSDS

Note: This test kit ships in two boxes and a $22.00 Hazardous Materials Charge accompanies the box that houses the reagents. This charge does not show up on the Shopping Cart and will be added to the invoice.