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10. Classification of soil analysis results into indices: The Olsen extractable phosphorus concentration in soil is classified into an index according to the following scale.
Soil phosphorus index | Olsen extractable phosphorus (P) (mg P/l) |
---|---|
0 | 0 – 9 |
1 | 10 – 15 |
2- | 16 – 20 |
2+ | 21 – 25 |
3 | 26 – 45 |
4 | 46 – 70 |