Code of Maine Rules
01 - DEPARTMENT OF AGRICULTURE, CONSERVATION AND FORESTRY
001 - AGRICULTURE - GENERAL
Chapter 350 - REGULATIONS UNDER THE MAINE COMMERCIAL FERTILIZER LAW
Section 001-350-4 - FERTILIZER DEFICIENCY - INVESTIGATIONAL ALLOWANCES

Universal Citation: 01 ME Code Rules ยง 001-350-4

Current through 2024-38, September 18, 2024

1. A commercial fertilizer shall be deemed deficient if the analysis of any nutrient is below the guaranteed percentage by an amount exceeding the values in the following schedule, or if the overall index value of the fertilizer is below 98%.

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

2. For values not listed in the above schedule, calculate the appropriate value by interpolation.

3. The overall index value is calculated by comparing the commercial value guaranteed with the commercial value found and shall be determined by using the following formula:

A. The calculation of the overall index value shall be determined by multiplying 100 times the commercial value found and dividing by the commercial value guaranteed.

4. Secondary and minor elements shall be deemed deficient if any nutrient's concentration is below the guaranteed percentage 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%).

Disclaimer: These regulations may not be the most recent version. Maine may have more current or accurate information. We make no warranties or guarantees about the accuracy, completeness, or adequacy of the information contained on this site or the information linked to on the state site. Please check official sources.
This site is protected by reCAPTCHA and the Google Privacy Policy and Terms of Service apply.