LaMotte AST Series Professional Soil Test Outfits User Manual
Page 39
PLANT TISSUE PROCEDURE
Follow the test procedures for nitrate nitrogen, phosphorus and
potassium, using tissue extract instead of soil extract. Results should be
used in a comparative manner, which can be used with the lists below to
determine relative concentrations. The most meaningful test results will
be obtained by comparing healthy plants to problem plants.
Guidelines for Interpreting Plant Tissue Tests
Test Factor
Test Reaction
Relative Amount Of
Nutrient In Plant Tissue
Nitrate Nitrogen Dark Pink Color
Abundant
Light Pink Color
Adequate
Colorless
No Reserve/Probably Deficient
Phosphorus
Deep Blue Color
Adequate
Light Blue Color
Adequate
Yellow to Colorless
Low to Deficient
Potassium
Heavy Precipitate
Adequate to Abundant
Medium Precipitate
Low to Deficient
Trace Precipitate
Deficient
No Precipitate
Very Deficient
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