Which stage of corn development is associated with zinc (Zn) deficiency symptoms?

Zinc deficiency in corn is most commonly associated with the 4-6 leaf stage of development. During this time, the plant's demand for micronutrients, including zinc, increases significantly as it establishes its leaves and prepares for the later stages of growth. Zinc is crucial for the synthesis of certain proteins and plays a vital role in various physiological processes, such as photosynthesis and hormone production. Deficiencies typically manifest as stunted growth and chlorosis, particularly in young leaves, as zinc is immobile within the plant.

While zinc deficiency can potentially impact plants at other growth stages, such as the seedling stage, flowering, or when the first set of ears appears, it is particularly during the 4-6 leaf stage that the symptoms are most pronounced. This stage represents a critical period when the plant is actively growing and establishing itself, making it more susceptible to zinc deficiency if the micronutrient levels in the soil are inadequate.