What is the optimum range for potassium (K) concentration in soil?

The optimum range for potassium (K) concentration in soil is 100 - 200 ppm K. This range is considered ideal for most crops, as it provides sufficient potassium for proper plant growth and development. Potassium is crucial for various physiological functions in plants, including water regulation, enzyme activation, and photosynthesis.

When soil potassium levels fall below this range, plants may experience deficiency symptoms such as yellowing of the leaves and poor root development. Conversely, levels that exceed this optimum range might lead to nutrient imbalances that can negatively affect plant health and soil structure. Maintaining potassium levels within the 100 - 200 ppm range ensures that crops receive the necessary nutrients for optimal yield and quality.