Question

The water soluble phosphorus content (ppm) in normal cultivated soil is:

• A. 0.1
• B. 1.5
• C. 2.0
• D. 0.5

Hint:

Phosphorus in soil:
- Water-soluble P: ~0.5 ppm.
- Available P (by Olsen method): 10-25 ppm.
- Total P: 200-1000 ppm.

Answer 1

The Correct Option is D

Step 1: Understanding the Question:
This question tests knowledge of soil nutrient content.

Step 2: Detailed Explanation:
The water-soluble phosphorus content in normal cultivated soil is about 0.5 ppm.
Phosphorus is largely unavailable to plants because it forms insoluble compounds.
The total phosphorus in soil is higher, but water-soluble P is very low.
Thus, the correct value is 0.5 ppm.

Step 3: Final Answer:
Thus, the water-soluble phosphorus content in normal cultivated soil is 0.5 ppm, which corresponds to option (D).
[0.5cm]