What are critical limits of macro nutrients in soil?

Critical limits of macronutrients in soil refer to the minimum concentrations required for optimal plant growth and development. These limits typically include nitrogen (N), phosphorus (P), and potassium (K), which are essential for various physiological functions. If these nutrients fall below their critical limits, plants may exhibit deficiencies, leading to poor growth, reduced yields, and increased susceptibility to pests and diseases. Regular soil testing can help farmers manage nutrient levels effectively to maintain soil health and productivity.