Which of the following is a symptom of manganese (Mn) deficiency in soybeans?

Manganese deficiency in soybeans is characterized by a specific symptom where the leaves exhibit a faint, pale green color between the leaf veins, contrasting with the darker green veins. This symptom is often referred to as interveinal chlorosis and indicates that the plant is unable to effectively utilize manganese, which is essential for various physiological processes including photosynthesis and enzyme function.

The appearance of the leaf tissue surrounding the veins turning pale while the veins themselves remain green is a clear indication of manganese deficiency, helping growers identify and address the nutrient imbalance in their crops. This condition not only hinders the plant’s growth but can also lead to reduced yield if not corrected.

Other symptoms or symptoms associated with other deficiencies or issues, such as pale flowers or grey speck on new leaves, do not specifically indicate manganese deficiency. Yellowing of upper leaves could suggest other nutrient deficiencies or stress factors instead, making it important for growers to recognize the characteristic symptom of interveinal chlorosis as a definitive sign of manganese deficiency.