The possible resource of phosphorus ions and nitrogen ions in soil generally get depleted because they are usually found as

Options

A. Positively charged ions
B. Negatively charged ions
C. A disproportionate mixture of negatively charged ions
D. Particles carrying no charge

Explanation

### Step-by-Step Solution:

1. **Understanding Soil Composition**:
- Soil contains various minerals and nutrients essential for plant growth, including phosphorus and nitrogen. These nutrients are often found in ionic forms.

2. **Ionic Forms of Nutrients**:
- Phosphorus is typically present in the soil as phosphate ions (H2PO4^- or HPO4^2-), while nitrogen is often found as nitrate ions (NO3^-). Both of these ions carry a negative charge.

...