LaMotte STH Outfit - Manual (Page 21)

21
PLANT TISSUE TEST PROCEDURE
Follow the soil test procedures for nitrate nitrogen, phosphorus, and
potassium, using the tissue extract in place of the general soil extract.
Remember that the color charts should only be used in a comparative
manner, along with the relative values suggested. The most meaningful
test results will be obtained from the comparison of healthy plant and
problem plant test reactions.
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
Defi cient
Phosphorus Deep Blue Color Abundant
Light Blue Color Adequate
Yellow to Colorless Low to Defi cient
Potassium Heavy Precipitate Adequate to Abundant
Medium Precipitate Low to Defi cient
Trace Precipitate Defi cient
No Precipitate Very Defi cient