Ann: OHD Trials Continue to Excel, page-104

What is the TOTAL cost of the Huetts formulation vs OHD ???

Huett’s lettuce formulation can be modified to adjust the pH downwards if it exceeds 6.5. This is achieved by increasing the proportion of ammonium in the formulation (Table 2). Other chemicals can be used to adjust the pH of the solutions being delivered to the crop. To reduce the pH, phosphoric acid or nitric acid is used, and to increase the pH, potassium bicarbonate or potassium hydroxide is used. Potassium bicarbonate is the safest chemical to handle for increasing pH. Be aware that as these chemicals are added to adjust the pH, they themselves are a nutrient which in some cases may adversely unbalance the nutrient solution. Take care to calibrate the pH meter frequently and to store it according to the manufacturer’s instructions. This will ensure that readings are accurate.

Lets see what the PFS reveals.