Spectrum Technologies Field Scout 2266FS Product Manual page 22

Greenhouse Media
Classification of Greenhouse Media
Comments
Very low levels. Indicates
very low nutrient status.
Suitable range for seedlings
and salt sensitive plants.
Desirable range for most
established plants. Upper
range may reduce growth
of some sensitive plants.
Slightly higher than desira-
ble. Loss of vigor in upper
range. OK for high nutrient
requiring plants.
Reduced growth and vigor.
Wilting and marginal leaf
burn.
Severe salt injury symp-
toms with crop.
Soluble salt guidelines for greenhouse media using
various media to water ratios (Testing and Nutrition
Guideline, MSU Ag Facts Extension Bulletin E-1736,
September, 1983).
a
saturated media extract
b
1 part soil to 2 parts water
c
1 part soil to 5 parts water
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Appendix 4
Electrical Conductivity (mS/cm)
SME
0 - .74
.75 - 1.99
2.00 - 3.49
3.50 - 5.00 1.25 - 1.75
5.00 - 6.00 1.75 - 2.25 .90 - 1.10
6.00+
a b
1 to 2
0 - .25
.25 - .75
.75 - 1.25
2.25+
c
1 to 5
0 - .12
.12 - .35
.35 - .65
.65 - .90
1.10+