Sec. 153.6. Analytical tolerances

(a) Any commercial fertilizer shall be deemed deficient if the analysis of any primary nutrient is below the guarantee by an amount exceeding the values in the following schedule:

Guarantee percent	Nitrogen percent	Available phosphoric acid percent	Potash percent
4 or less	0.49	0.67	0.41
5	0.51	0.67	0.43
6	0.52	0.67	0.47
7	0.54	0.68	0.53
8	0.55	0.68	0.60
9	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 guarantees not listed, the appropriate values shall be calculated by interpolation.

(b) Any commercial fertilizer shall be deemed deficient if the analysis of any secondary or minor elements is below the guarantee by an amount exceeding the values in the following schedule:

Element	Allowable deficiency
Calcium	0.2	unit + 5% of guarantee
Magnesium	0.2	″ + 5% ″ ″
Sulfur	0.2	″ + 5% ″ ″
Boron	0.003	″ + 15% ″ ″
Cobalt	0.0001	″ + 30% ″ ″
Molybdenum	0.0001	″ + 30% ″ ″
Chlorine	0.005	″ + 10% ″ ″
Copper	0.005	″ + 10% ″ ″
Iron	0.005	″ + 10% ″ ″
Manganese	0.005	″ + 10% ″ ″
Sodium	0.005	″ + 10% ″ ″
Zinc	0.005	″ + 10% ″ ″

The maximum allowance when calculated in accordance with the above values shall be one unit (1%).