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Phosphorus and nitrogen ions generally get depleted in soil because they usually occur as

1. neutral ions
2. negatively charged ions
3. positively charged ions
4. both positively and negatively charged but disproportionate mixture

Correct answer: negatively charged ions

Solution

Phosphorus and nitrogen in soil are often present as anions, such as phosphate and nitrate. Because many soil particles are negatively charged, these ions are not strongly retained and can be lost by leaching, leading to depletion.

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