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  a371 East 16th Street
 AChicago Heights, IL 60411
aPhone 708-757-7500
Fax 708-757-5224
Manufacturer of water soluble fertilizers and horticultural products since 1922.

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Nutriculture Conductivity Chart
This chart has been developed as a reference to verify the accuracy of fertilizer injectors. The chart is designed to be used in the following manner:
  1. Determine the    conductivity of your clear irrigation water.
  2. Determine the conductivity of your fertilizer solution after it has been proportioned (at the emitter as it is applied to the plants).
  3. Subtract the value of 1. (clear water) from 2. (fertilizer solution).
  4. Compare this answer with the values on the chart to determine the parts per million of nitrogen being injected.
Formulations and Conductivity in Millimhos (mmhos)

PPM NITROGEN CONCENTRATION

FORMULA

50

100

150

200

300

400

500

5-40-17

.25

.49

.75

.99

1.49

1.99

2.48

10-20-30

.50

.99

1.50

1.99

2.99

3.98

4.79

12-31-14

.42

.84

1.25

1.67

2.51

3.34

4.18

12-45-10

.36

.71

1.07

1.42

2.13

2.84

3.55

13-0-44

.48

.95

1.41

1.88

2.83

3.77

4.73

13-2-13

.37

.75

1.12

1.50

2.25

3.00

3.75

14-0-14

.37

.75

1.12

1.50

2.25

3.00

3.75

15-0-15

.34

.69

1.03

1.38

2.06

2.75

3.44

15-3-20

.35

.70

1.05

1.40

2.10

2.80

3.50

15-5-25

.38

.76

1.14

1.52

2.28

3.04

3.80

15-10-30

.35

.71

1.06

1.42

2.12

2.83

3.54

15-20-25

.33

.66

1.00

1.37

2.05

2.74

3.42

15-30-15

.32

.64

.96

1.28

1.93

2.57

3.21

16-4-12

.33

.68

1.01

1.35

2.04

2.70

3.37

17-0-17

.35

.70

1.05

1.40

2.10

2.80

3.50

17-5-17

.34

.68

1.01

1.37

2.04

2.70

3.40

17-17-17

.27

.54

.80

1.07

1.61

2.14

2.68

19-26-14

.21

.42

.63

.84

1.25

1.67

2.09

20-0-20

.21

.41

.62

.82

1.23

1.64

2.05

20-5-30

.23

.47

.70

.93

1.39

1.86

2.33

20-7-20

.33

.65

.99

1.30

1.95

2.60

3.25

20-10-20

.31

.62

.94

1.25

1.88

2.50

3.13

20-20-20

.21

.41

.62

.82

1.23

1.64

2.05

20-30-10

.27

.55

.83

1.10

1.65

2.20

2.75

21-7-7  

.21

.43

.65

.85

1.27

1.68

2.10

25-0-25

.15

.30

.45

.61

.92

1.22

1.52

25-5-10

.16

.32

.48

.64

.96

1.28

1.60

25-15-10

.15

.31

.46

.62

.92

1.23

1.55

28-18-8

.10

.20

.30

.40

.60

.80

1.00

30-10-10

.11

.22

.33

.43

.66

.85

1.10
An Example:

If a reading of irrigation water has a value of .2 mmhos and a value of 1.0 mmhos is obtained from the fertilizer-injected water using 20-20-20, the corrected value would be 1.0 - .2 = .80. A look at the chart indicates a value of .82 for 20-20-20 being injected at 200 PPM. With an allowance of + or - 10% this is well within range.

To convert millimhos (mmhos) to micromhos (umhos) multiply by 1000.

The values on this chart were obtained under laboratory conditions using distilled water. The values obtained by the grower under field conditions could therefore, vary slightly (+10%) from values listed here.

This chart is to be used with Plant Marvel's Nutriculture formulations. Other brands may be composed of different raw materials which would give different values, even though they are the same analysis.

Copyright 1998 PML, Inc.

 

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