Nutrient Balances
From what I have read on the internet, nutrient ratios that are recommended are different than Cronometer's green-marked guages.
For example:
The recommended Potassium:Sodium seems to around 3:1, but the green guage shows that to be around 6.
The recommended Zinc:Copper ratio seems to be between 8:1 and 12:1, but the green guage shows the optimal to be 12:1.
What is Cronometer using for sources?