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Agricultural Outfits
Model AST-5 and Model SDT-15
Advanced Agricultural Soil Testing 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.

Soil nutrients are drawn from the test sample, providing a clear liquid extract. The addition of an indicator reagent to the clear extract produces a color reaction in direct proportion to the nutrient concentration in the test solution. The developed color is read against permanent, translucent color standards provided in the Octa-Slide Comparator. The result is a simple and distinct color match over a broad test range.

Model AST-15 Agricultural Outfit
Tests for calcium, magnesium and chloride are performed with an easy-to-use direct Reading Titrator. Reagent is dispensed into the sample solution extract until an end point color change is reached, then results are read directly form the titrator in parts per million.

Measurement of potassium is conducted with a unique turbidity tube system. Copper is determined by means of a drop count method, and humus is measured against a color chart index with five color standards. The AST outfits also include simplified procedures for screening of nitrates, phosphorus and potassium in plant tissue.

Both Model AST outfits are furnished in rugged, lightweight carrying cases with components securely mounted in removable foam-lined trays. This format permits easy conversion from an in-store lab to service in the field. Each kit includes simplified and complete instructions, a pad of soil analysis report forms, instructions for collecting representative soil samples and a copy of the LaMotte Soil Handbook. This handbook contains charts with data on the nutrient needs of various crops. It also contains general information on using soil test results to determine actual lime and fertilizer requirements for optimal plant growth.

The Model AST-5, Model AST-15 and the corresponding Reagent Refills have been discontinued.
The recommended replacement kit is Model STH 5 and Model STH 14.

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