What color indicates phosphate deficiency in plants?

Phosphate deficiency in plants is indicated by a purple coloration in the leaves and stems. This purple hue is primarily due to the accumulation of anthocyanin pigments, which are produced when plants experience a lack of phosphorus. Phosphorus plays a crucial role in energy transfer within the plant, particularly in processes like photosynthesis and respiration. When there is an inadequate supply of this nutrient, the plant struggles to carry out these essential functions, leading to altered pigmentation.

In contrast, yellowing of leaves typically suggests nitrogen deficiency, while green leaves indicate adequate nutrient levels, and browning is often associated with issues like overwatering or other nutrient imbalances. Hence, the presence of purple coloration serves as a distinct and visual indicator of phosphate deficiency in plants.