The organic matter, generally 0.5 - 0.8% to about 75 - 100 cm depth, drops to about 0.3% at ______.
Correct answer: A. Lower depths
- A. Lower depths
- B. Upper depths
- C. Middle depths
- D. None of these
Explanation
Organic matter normally decreases with depth because plant residues and roots are concentrated near the surface, so it falls to about 0.3% in the lower layers. “Upper depths” would have the comparatively higher organic-matter content.
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