2. Typical Symptoms of Manganese Deficiency
Understanding the symptoms of manganese deficiency is a prerequisite for the rational application of manganese sulfate. Manganese deficiency first appears on new leaves.
Common characteristics: Interveinal chlorosis occurs in leaves, resulting in yellow or yellowish-white streaks, but the veins and surrounding areas remain green, exhibiting a "rib-like" or "reticulated" yellowing. In severe cases, the chlorotic areas turn grayish-white and necrotic spots appear.
Specific crop examples:
Soybean: "Gray spot disease," new leaves show interveinal chlorosis, and the leaves turn grayish-white or reddish-brown.
Wheat: "Gray spot disease" or "white wilt," leaves show gray or light yellow streaks.
Corn: New leaves show yellow streaks parallel to the veins.
Fruit trees (e.g., apples, citrus): Interveinal chlorosis occurs, but the main vein remains green; in severe cases, leaves fall off prematurely.
Vegetables (e.g., tomatoes, potatoes): New leaflets show interveinal chlorosis, and the leaves become wrinkled.