The Availability of Nutrient Cations Such as Ca²⁺, K⁺, and Mg²⁺

question 44

Multiple Choice

The availability of nutrient cations such as Ca²⁺, K⁺, and Mg²⁺ to plants may be insufficient in some soils that have low amounts of _______ particles. These particles have _______ that allow them to hold onto cations and exchange them with the soil solution.

• A) sand; strong positive charges
• B) clay; weak negative charges
• C) sand; semicrystalline structures
• D) clay; irregular structures

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