Lamotte STH Outfit User Manual

Combination Soil Outfi tInstruction ManualModelSTH Series

10PhosphorusThe role of phosphorus in plant nutrition is discussed in the LaMotte Soil Handbook. For interpretation of test results see the LaMotte So

11HumusHumus consists of the complex remains of fresh plant and animal residue after extensive chemical and biological breakdown. Humus accounts for 6

12MagnesiumMagnesium is a constituent of chlorophyll, and chlorosis can result from magnesium defi ciency. Like calcium, magnesium cations play a role

13CalciumCalcium defi ciency is seldom a direct limiting factor in plant growth, because the lack of adequate calcium in a soil causes other growth lim

14SulfateSulfur is essential to the formation of protein and affects various aspects of plant metabolism. Sulfur-defi cient plants are pale green in co

15ChlorideChlorides are present in practically all soils. Application of fertilizer may increase chloride levels. Chlorides are removed from the soil

16Nitrite NitrogenNitrites are formed as an intermediate step in the production of nitrates. Soils that are well drained and aerated contain only smal

17Ammonia NitrogenA fertile soil may be expected to give a low ammonia nitrogen test reading, unless there has been a recent application of nitrogenou

18ManganeseAn essential element in the enzyme system of plants, manganese plays a role in metabolic reactions affecting germination, photosynthesis, a

19Units of MeasureTest results are expressed in the following terms:Parts per Million (ppm)Pounds Per Acre (lb/acre)Relative Amounts from Very Low to

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20Green Plant Tissue TestsTesting an extract prepared from fresh plant tissue provides a means of verifying suspected nutrient defi ciencies during pla

21PLANT TISSUE TEST PROCEDUREFollow the soil test procedures for nitrate nitrogen, phosphorus, and potassium, using the tissue extract in place of the

22Soil Test ReagentsThis information is provided to enable the soil analyst to correlate LaMotte soil test results with results obtained using other s

23Magnesium Test - The dye Titian Yellow, *Magnesium Test Solution 1 (5140), is absorbed on the precipitated magnesium hydroxide which is formed when

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Introduction ... 4Multiple Sample Testing ... 5

4IntroductionThis instruction manual is designed for use with the LaMotte STH Series of professional soil testing outfi ts. The basic Model STH-4 Outfi

5Multiple Sample TestingWhen extracts from two or more samples are being tested simultaneously use separate pipets for each extract. Mixing samples wi

6Test ProcedurespHpH is a measure of acidity or basicity. Soils can have a pH from 3.5 to 11.0, but plants grow well in the range of 5.0 to 8.5. In so

76. Add two drops of the chosen narrow range indicator to the second sample on the spot plate. Compare the resulting color reaction against the appro

8Nitrate NitrogenThe role of nitrogen in plant nutrition is discussed in the LaMotte Soil Handbook. For interpretation of test results see the LaMotte

94. Stand the empty Potash “B” Tube (0246) on the Potassium Reading Plate (1107), a rectangular piece of white plexiglass with a solid black line dow