What is the primary soil uptake form for Manganese (Mn)?

The primary soil uptake form for manganese (Mn) is the manganous ion (Mn²⁺). Manganese is an essential micronutrient for plants, playing a crucial role in photosynthesis, respiration, and nitrogen assimilation. In soil, manganese usually exists in various oxidation states, but the most bioavailable and easily absorbed form by plant roots is the manganous ion. This ion forms under conditions of low pH and high organic matter, making it readily accessible for uptake.

The other options provided do not represent the correct form of manganese uptake. Molybdate is associated with molybdenum, not manganese. Zinc and nickel are also essential micronutrients but are distinct from manganese and do not serve as its uptake forms. Understanding the correct uptake form of micronutrients is critical for optimal plant health and development, particularly when managing soil fertility and nutrient applications.