Section 02.06.02.470 - INVESTIGATIONAL ALLOWANCES01.Deeming a Fertilizer Deficient. A fertilizer will be deemed deficient if the analysis of any nutrient is below the guarantee by an amount exceeding the values in the following schedules, or if the overall index value of the fertilizer is below ninety-seven percent (97%). Note: For these investigational allowances to be applicable, the recommended AOAC International procedures for obtaining samples, preparation and analysis must be used. These are described in Official Methods of Analysis of the Association of Official Analytical Chemists, 13th Edition, 1980, and in succeeding issues of the Journal of the Association of Official Analytical Chemists. In evaluating replicate data, Table 19, page 935, Journal of the Association of Official Analytical Chemists, Volume 49, No. 5, October, 1966, should be followed.02.Investigational Allowances for Nitrogen, Phosphate and Potash. For guaranteed percentages not listed in the following table, calculate the appropriate investigational allowance by interpolation. Guaranteed Percent | Nitrogen Percent | Available Phosphate Percent | Potash 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 is zero point seventy (0.70); for TSP, the Investigational Allowance shall be: one point fifty-two (1.52)). For dry custom mix fertilizers, an additional five percent (5%) of the guaranteed percentage shall be granted in addition to the allowances made in Subsection 470.02.
Idaho Admin. Code r. 02.06.02.470