Hanna Instruments HI83325 - Recommended Dilution Procedures

22
NUTRIENT SAMPLES PREPARATION GUIDE
Recommended Procedures/Dilutions According to Nutrient Concentration:
Parameter Estimated Concentration
Dilution
Factor
Method
Selection
Typical Usage
Ammonia < 2.5 ppm NH
3
-N No dilution Ammonia LR Irrigation Water
2.5 - 9 ppm NH
3
-N No dilution Ammonia MR Irrigation Water
9 - 100 ppm NH
3
-N No dilution Ammonia HR Recycled Nutrient Solution
Fresh Nutrient Solution
Nitrate < 25 ppm NO
3
-N No dilution Nitrate Irrigation Water
25 - 130 ppm NO
3
-N 5 Nitrate Recycled Nutrient Solution
130 - 300 ppm NO
3
-N 10 Nitrate Fresh Nutrient Solution
Phosphorus < 9 ppm P
(< 27 ppm PO
4
3-
)
No dilution Phosphate HR Irrigation Water
9 - 45 ppm P
(27 - 135 ppm PO
4
3-
)
5 Phosphate HR Recycled Nutrient Solution
45 - 100 ppm P
(135 - 300 ppm PO
4
3-
)
10 Phosphate HR Fresh Nutrient Solution
Potassium < 18 ppm K No dilution Potassium Irrigation Water
18 - 90 ppm K 5 Potassium Recycled Nutrient Solution
90 - 180 ppm K 10 Potassium Fresh Nutrient Solution
180 - 1000 ppm K 50 Potassium Fresh Nutrient Solution
The concentration of the micro-nutrients (calcium, magnesium, sulfate) is low enough in most
samples that dilution is typically not required. If necessary, a dilution procedure can be used for these
parameters as well.