Guarantee, percent | Nitrogen (N) | Avail. Phosphate (P2O5) | Sol. Potash (K2O) |
Investigational Allowance, percent | |||
04 or less | 0.49 | 0.67 | 0.41 |
05 | 0.51 | 0.67 | 0.43 |
06 | 0.52 | 0.67 | 0.47 |
07 | 0.54 | 0.68 | 0.53 |
08 | 0.55 | 0.68 | 0.60 |
09 | 0.57 | 0.68 | 0.65 |
10 | 0.58 | 0.69 | 0.70 |
12 | 0.61 | 0.69 | 0.79 |
14 | 0.63 | 0.70 | 0.87 |
16 | 0.67 | 0.70 | 0.94 |
18 | 0.70 | 0.71 | 1.01 |
20 | 0.73 | 0.72 | 1.08 |
22 | 0.75 | 0.72 | 1.15 |
24 | 0.78 | 0.73 | 1.21 |
26 | 0.81 | 0.73 | 1.27 |
28 | 0.83 | 0.74 | 1.33 |
30 | 0.86 | 0.75 | 1.39 |
32 or more [*] | 0.88 | 0.76 | 1.44 |
[*For DAP and MAP the investigational Allowance for Available Phosphate shall be: 0.70; For TSP the Investigational Allowance shall be: 1.53]
For guarantees not listed, calculate the appropriate value by interpolation.
The overall index value is calculated by comparing the commercial value guaranteed with the commercial value found. The values for commercial fertilizer nutrients are derived from the average retail value from a state-wide survey of bulk fertilizer blenders.
Secondary and minor elements shall be considered deficient if any element is below the guarantee by an amount exceeding the values in the following schedule:
Element Investigational Allowance |
Calcium) 0.2 unit + 5% of guarantee |
Magnesium) 0.2 unit + 5% of guarantee |
Sulfur) 0.2 unit + 5% of guarantee |
Boron) 0.003 unit + 15% of guarantee |
Cobalt) 0.0001 unit + 30% of guarantee |
Chlorine) 0.005 unit + 10% of guarantee |
Copper) 0.005 unit + 10% of guarantee |
Iron) 0.005 unit + 10% of guarantee |
Manganese) 0.005 unit + 10% of guarantee |
Molybdenum) 0.0001 unit + 30% of guarantee |
Sodium) 0.005 unit + 10% of guarantee |
Zinc) 0.005 unit + 10% of guarantee |
The maximum allowance when calculated in accordance to the above shall be 1 unit (1%).
W. Va. Code R. § 61-6-9