Question

Bray No. 1 is

• A. $0.5\,\text{M }\text{NaHCO}_3$ at $\text{pH } 8.5$
• B. $0.5\,\text{N }\text{NaHCO}_3$ at $\text{pH } 8.5$
• C. $0.03\,\text{M }\text{NH}_4\text{F} + 0.025\,\text{N }\text{HCl}$
• D. $0.03\,\text{N }\text{NH}_4\text{F} + 0.025\,\text{N }\text{HCl}$

Hint:

Remember the diagnostic extractants for available Phosphorus:
- Acid soils $\rightarrow$ Bray No. 1 ($0.03\,\text{N }\text{NH}_4\text{F} + 0.025\,\text{N }\text{HCl}$)
- Alkaline/Neutral soils $\rightarrow$ Olsen's reagent ($0.5\,\text{M }\text{NaHCO}_3$ at $\text{pH } 8.5$)

Answer 1

The Correct Option is D