Critical limit of available phosphorus in soil for wheat crop by Olsen's method is

A. 5 kg/ha

B. 10 kg/ha

C. 25 kg/ha

D. 22.5 kg/ha

Answer: Option B

Solution(By Examveda Team)

The critical limit of available phosphorus in soil for the wheat crop by Olsen's method is 10 kg/ha.
Olsen’s method is done for the estimation of phosphorus and is based on the extraction of phosphate from the soil by 0.5 N sodium bicarbonate solution adjusted to pH 8.5. this procedure is suitable for calcareous, alkaline, neutral, and slightly acidic soils containing CaPO₄.