Which potassium source is known for its low cost and high solubility but has a risk of salt toxicity due to chloride ions?

Muriate of Potash is recognized as an effective source of potassium due to its affordability and high solubility in water. It contains potassium chloride, which easily dissolves and makes it readily available for plant uptake. This high solubility is advantageous for crops that require quick access to potassium during their growth stages.

However, the presence of chloride ions in muriate of potash can pose a risk of salt toxicity, especially in crops sensitive to chloride. Excessive chloride can lead to various plant health issues, such as reduced growth and development, as it can disrupt nutrient uptake and lead to adverse physiological responses in plants.

In contrast, other potassium sources like Sulphate of Potash may provide potassium without the chloride risk, but they typically come at a higher cost and may have different solubility characteristics. Calcium Sulphate, while useful for providing calcium and improving soil structure, does not serve as a potassium source. Thus, Muriate of Potash stands out for its cost-effectiveness and high solubility, albeit with associated risks related to chloride content.