Make sure to zero the weight of the weigh tray!

Measurement Accuracy

Purpose

The purpose of this lab is to make four jars of fertilizer solution.

Procedure

Changes Made

1: Fill Containers

1. Fill four 64 oz mason jars with 1700 mL distilled water.
2. Add 1.417 g of fertilizer for a target 100 ppm Nitrogen.
3. Wait at least 5 minutes then measure and note EC levels.
4. Do a preliminary check of pH. If above 5, stop and check for the expected pH crash the next day.

2: Adjust pH

1. If the pH is under 5.5, pipette 1 mL of potassium carbonate (GH pH Up) at a time, stir. Wait 5 minutes and re-check pH.
2. Cap the jars and wait a day before planting to re-check pH.

Materials

• pH will be checked using 4.5-8.5 pH test paper from Micro Essentials Lab (Hydrion).
• Use a transfer pipette for pH Up adjustments.
  • Rinse with DI water in-between adjustments and rest in a DI water beaker.
• Use a plastic straw to stir.

Results & Observations

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Conclusion

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