When cultivating leafy greens in hydroponic systems like Vertefarm, maintaining an optimal pH range (5.5 to 6.5) is crucial for nutrient uptake. Occasionally, the pH may rise above 7, requiring adjustment. One effective natural method for lowering pH is the addition of lemon juice.

Guidelines for Using Lemon Juice:

Formula for Calculating Required Lemon Juice Volume:

Lemon Juice Volume (ml) = 3.2 ml × Desired pH Reduction (units) × Water Volume (Liter)/10 

Example:

To reduce the pH from 7 to 6 in a 10-liter system, you need 3.2 ml of lemon juice.

Considerations:

• Citric Acid Concentration: This formula assumes the lemon juice contains 6% citric acid, typical for concentrations ranging from 5% to 8%.
• Water Buffering: Compounds in your water may influence the effectiveness of pH adjustment. Hard water, for example, may require more acid to achieve the same pH change.

Practical Application:

• Incremental Addition: For accuracy, add the lemon juice in increments. If the calculation suggests 5 ml, add half (2.5 ml) initially. Then, test the pH and adjust the subsequent addition based on the results. This cautious approach helps avoid over-correction, ensuring the pH does not drop below the desired level.

Safety Note:

• Always handle pH adjustments carefully. Use reliable pH meters or test strips to monitor changes accurately.

By following these guidelines, you can maintain the ideal pH for your hydroponic system, ensuring healthy growth and optimal nutrient absorption by your plants.