Sulfur

Sulfur is an important nutrient for crops. Deficiencies in sulfur are uncommon, but are very dangerous. More common are sulfur excesses due to it being a common secondary ingredient in fertilizers. Plants are quite resilient to high sulfur content, but sulfur in abundance can prevent proper nitrogen uptake, and decrease soil pH below a safe acidity. For that reason, keeping an eye on sulfur content in sap is particularly important for hydroponic growers. Applying sulfur-based fertigation solvents can quickly pose a risk of excessively acidic conditions.