Statutes, codes, and regulations
Colorado Administrative Code
Department 1200 - Department of AgricultureDivision 1202 - Inspection and Consumer Services Division
Rule 8 CCR 1202-4 - FERTILIZERS AND SOIL CONDITIONERS
Part 6 - Analytical and Sampling Methods

8 Colo. Code Regs. § 1202-4, pt. 6

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Current through Register Vol. 47, No. 20, October 25, 2024
Part 6 - Analytical and Sampling Methods
6.1 The methods of sampling for fertilizers, soil conditioners and plant amendments shall be those set forth in the 20th Edition of the Official Methods of Analysis of the Association of Analytical Communities (AOAC) International, or such other methods adopted by the Commissioner from authoritative sources that the Commissioner deems reliable including but not limited to Colorado State University. This Rule incorporates by reference the AOAC methods of analysis, 20th edition. This Rule does not adopt any later amendments to, or editions of, the AOAC methods of analysis. A copy of the 20th edition of the AOAC shall be kept on file at the Department of Agriculture, located at 305 Interlocken Parkway, Broomfield Colorado 80021, and shall be open to public inspection, and available for copying, during normal business hours. A copy of the official publication shall also be kept at AOAC International, located at 2275 Research Blvd., suite 300, Rockville Maryland 20850 and is available online at: AOAC.org. This, and any other material that is incorporated by reference, may be examined at any state publications depository library.
6.2 The methods for sampling and analysis of compost shall be those specified in Test Methods for the Examination of Composting and Compost, U. S. Composting Council Research and Education Foundation (CCREF), and United States Department of Agriculture (USDA) (TMECC, 2002) or such other methods adopted by the Commissioner from authoritative sources that the Commissioner deems reliable, including but not limited to Colorado State University. The Test Methods for the Examination of Composting and Compost, U.S. Composting Council Research and Education Foundation (CCREF), and United States Department of Agriculture (USDA) (TMECC, 2002) is herein incorporated by reference. It does not include later amendments or editions of the publication. A copy of the 2002 edition of the TMECC shall be kept on file at the Department of Agriculture, located at 305 Interlocken Parkway, Broomfield Colorado 80021, and shall be open to public inspection, and available for copying, during normal business hours. A copy of the official publication shall also be kept with the U.S. Composting Council, located at 1053 East Whitaker Mill Road, Suite 115, Raleigh North Carolina 27604, and is available online at: compostingcouncil.org. This, and any other material that is incorporated by reference, may be examined at any state publications depository library.
6.3 Investigational Allowances
6.3.1 A commercial fertilizer shall be deemed deficient if the analysis of any nutrient is below the guarantee percent by an amount exceeding the applicable value specified in the following schedule, or if the index value of the fertilizer is below 98%:

Guarantee percent

Nitrogen percent

Available Phosphate percent

Soluble 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, calculate the appropriate value by Interpolation.

6.3.2 Other elements shall be deemed deficient if any element is below the guarantee by an amount exceeding the applicable value specified in the following schedule:

Element

GUARANTEE

ALLOWABLE DEFICIENCY

Calcium and Sulfur

1% and up

0.2 units + 5% of guarantee

Magnesium

0.5% and up

0.2 units + 5% of guarantee

Boron

.02% to 5%

.003 units + 15% of guarantee

5.0% and up

Potash Schedule 6.3 (a)

Cobalt and Molybdenum

.0005% to 1.0%

.0001 units + 30% of guarantee

1.0% to 4.0%

.2 units + 10% of guarantee

4.1% and up

Potash Schedule 6.3 (a)

Chlorine, Iron & Sodium

0.1% to 4.0%

.005 units + 10% of guarantee

4.1% and up

Potash Schedule 6.3 (a)

Copper, Manganese, & Zinc

.05% to 4.0%

.005 units + 10% of guarantee

4.1% and up

Potash Schedule 6.3 (a)

6.3.3 The above tolerances listed in 6.3.1. and 6.3.2 are for single samples run in duplicate.

8 CCR 1202-4, pt. 6

40 CR 05, March 10, 2017, effective 3/30/2017
40 CR 23, December 10, 2017, effective 12/30/2017
43 CR 22, November 25, 2020, effective 12/15/2020
45 CR 13, July 10, 2022, effective 7/30/2022