The pH range for hydroponic nutrition products is normally between 5.5 and 6.0, which is ideal for the majority of crops. However, the pH range is dependent on the unique formulation. For instance, calcium salts produce a rise in pH, resulting in a more alkaline solution, but ammonium nitrate has a higher acidifying impact than nitrate and will cause a drop in pH levels.
For plants to absorb particular nutrients, a precise pH level is necessary. Too little or too much of a given nutrient can be a result of the improper pH level. For instance, plants may experience copper and iron toxicity or magnesium and calcium deficiency when the pH level falls below 5.0. However, an increase in pH above 6 or 6.5 can result in iron insufficiency.