What is the soil uptake form(s) for boron?

The correct answer highlights that the primary forms of boron that plants can uptake from the soil are boric acid and the borate ion. Boron is a crucial micronutrient for plant growth, playing vital roles in cell wall formation, membrane integrity, and reproductive development. In most soils, boron exists in these two forms, and their availability to plants depends significantly on soil pH and moisture conditions.

Boric acid is more prevalent in acid soils, while the borate ion tends to predominate in alkaline conditions. The plant roots absorb these forms, which are then transported via the xylem to various parts of the plant where boron is utilized.

Understanding boron's uptake mechanisms is essential for effective nutrient management in crop production, as both deficiency and excess can lead to critical growth issues. Other choices do not represent forms of boron and thus are not relevant to the question concerning soil uptake specifically related to this micronutrient.