Phosphorus (P) is one of the major nutrients essential for plants. While it is immobile in the soil, it is mobile within plant tissues. Phosphorus fulfills many physiological roles in plants, including:
Potassium (K) is a macronutrient essential for plant growth. It is a mobile nutrient in both soil and plants, meaning deficiency symptoms first appear on older leaves. Potassium plays a vital role in numerous physiological processes within the plant, including: