True or False: The optimum range for calcium (Ca) is 100 - 150 ppm.

The optimum range for calcium (Ca) in soil is a critical aspect of nutrient management and plant health. The ideal concentration of calcium can depend on several factors including the specific crop requirements and soil types. Typically, a broader range for adequate calcium levels in soil is considered to be higher than 150 ppm, often ranging upwards of 1000 ppm for optimal plant growth.

Thus, stating that the optimum range is strictly 100 - 150 ppm is inaccurate. Recognizing this larger context allows for better nutrient management decisions, ensuring crops receive adequate calcium for robust growth and development. The correct understanding of nutrient requirements reflects the complex interactions in soil chemistry, which informs best practices in nutrient management.