802 Washington Avenue PO Box 329 Chestertown, Maryland 21620 USA
Phone:
410.778.3100
USA:
800.344.3100
FAX:
410.778.6394
Model STH Series - Combination Soil Outfits
This line of 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 the Mehlich I extraction provide fast, simple and extremely accurate soil testing.
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 reagents 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 wants to make quick problem determinations in the field.
Colorimetric test methods are used for most test factors. Tests for calcium, sulfate and chlorides are based on turbidity measurements. Potassium analysis also employs a turbidity measurement, using a unique reading device designed in LaMotte laboratories to read directly in pounds per acre. A single extraction procedure, using Morgan Universal Extraction Solution, provides the 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 plant 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.
Results can be measured using a choice of units, explained here. Parts per million (ppm), pounds/acre, and Kg/hectare units can be converted to each other using these values:
Area
Soil Depth
Soil Weight
1 acre
6-7 inches
2 mil lbs.
1 hectare
15-18 cm
2.25 mil Kg
ppm
lb/Acre
Kg/Hectare
1
2
1.13
0.5
1
0.565
0.88
1.77
1
A number of variables must be considered when interpreting soil test results in addition to the values obtained. These variables include the composition of the soil, drainage, climate, previous fertilizer programs, and the type of plant to be grown. Samples must also be truly representative of the area being studied and must be carefully selected.
Order Codes
Item Description
Order Code
Macronutrients & pH Model STH-4
5029
Reagent Refill
R-5029
Macronutrients, pH, Humus, Calcium, & Magnesium Model STH-7
5061
Reagent Refill
R-5061
Macronutrients, pH, & Humus Model STH-5
5007
Reagent Refill
R-5007
Macronutrients, Micronutrients, & pH Model STH-14
5010-01
Reagent Refill
R-5010-01
Phosphorus Auxiliary package
5090
Where to Buy
The following is a list of Distributor's where you can purchase LaMotte Soil Testing Products.
If you do not see a specific LaMotte item listed, please contact your preferred vendor's Customer Service Department for more information.
This line of 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 the Mehlich I extraction provide fast, simple and extremely accurate soil testing.