The extractant used for available phosphorus in soils is
A. Alkaline permangnate
B. 0.5 M NaHCO3
C. NN Ammonium acetate
D. N Acetic acid
Answer: Option B
Solution(By Examveda Team)
The extractant used for available phosphorus in soils is 0.5 M NaHCO3, (Olsen). It is the most widely used method in P extraction for Routine fertility purposes, although it was initially proposed for neutral and alkaline soils.An extractant is a liquid used to remove a solute from a solution. Here, in Olsen method uses NaHCO3 extractant that can remove Ca-Phosphates and phosphate absorbed on the surface of surfaces of calcium and magnesium carbonates along with Al-phosphates. Phosphorus is extracted from the soil with 0.5 M NaHCO3 at a nearly constant pH of 8.5.
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