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Home > Licensing, Inspections, Certifications & Testing > Licensing > Ag Liming Materials > AgLime Recommendations in Pounds ENP per Acre

Ag-Lime Recommendations in Pounds ENP per Acre


University of Minnesota Soil Testing Laboratory
Lbs. ENP per acre recommendation based on a 6 inch plow layer

( To obtain the Ag-Lime recommendation for different plow depths, multiply the Ag-Lime recommendation by a factor of 0.17 for each inch greater than the 6-inch plow depth and add 1.

Example: Ag-Lime recommendation for 9-inch plow depth = (9-inches - 6-inches) X 0.17 + 1.0 = 1.5; then 1.5 X Ag-Lime recommedation listed on this table = Ag-Lime recommendation for a 9-inch plow depth.)

I. Applies to soil samples with soil-water pH test values of 6.0 and higher for MINERAL soils:

 

To raise pH to 6.5

To raise pH to 6.9

Soil-Water
pH

Area 1
Lbs. ENP
Per Acre

Area 2
Lbs. ENP
Per Acre

Area 1
Lbs. ENP
Per Acre

Area 2
Lbs. ENP
Per Acre

6.5

Not recommended

Not recommended

2,000

Not recommended

6.4

2,000

Not recommended

2,000

Not recommended

6.3

2,000

Not recommended

5,000

Not recommended

6.2

3,000

Not recommended

5,000

Not recommended

6.1

3,000

Not recommended

6,000

Not recommended

6.0

3,000

2,000

6,000

Not recommended

II. Applies to soil samples with soil-water pH test values lower than 6.0, where SMP Buffer Index method is used on MINERAL soils:

 

To raise pH to 6.0

To raise pH to 6.5

To raise pH to 6.9

SMP
Buffer
Index

Area 1
Lbs. ENP
Per Acre

Area 2
Lbs. ENP
Per Acre

Area 1
Lbs. ENP
Per Acre

Area 2
Lbs. ENP
Per Acre

Area 1
Lbs. ENP
Per Acre

Area 2
Lbs. ENP
Per Acre

6.8

2,000

Not recommended

3,000

2,000

5,000

Not recommended

6.7

2,000

Not recommended

3,500

2,000

5,000

Not recommended

6.6

2,000

Not recommended

4,000

2,000

6,000

Not recommended

6.5

2,500

Not recommended

4,500

2,000

6,500

Not recommended

6.4

3,000

2,000

5,000

2,500

7,000

Not recommended

6.3

3,500

2,000

5,500

2,500

7,500

Not recommended

6.2

4,000

2,000

6,000

3,000

8,000

Not recommended

6.1

4,500

2,000

6,500

3,000

8,500

Not recommended

6.0

5,000

2,500

7,000

3,500

9,000

Not recommended

5.9

5,500

2,500

7,500

3,500

9,500

Not recommended

5.8

6,000

3,000

8,000

4,000

10,000

Not recommended

5.7

6,500

3,000

8,500

4,000

10,500

Not recommended

5.6

7,000

3,500

9,000

4,500

11,000

Not recommended

III. Applies on ORGANIC soils only (SMP Buffer Index is not used): To raise pH to 5.5

Soil-Water pH

Area I

Area II

ENP

Ag Lime ****

ENP

Ag Lime ****

lb./acre

ton/acre

lb./acre

ton/acre

5.4

2000

2.0

2000

2.0

5.3

2000

2.0

2000

2.0

5.2

2000

2.0

2000

2.0

5.1

2000

2.0

2000

2.0

5.0

2000

2.0

2000

2.0

4.9

3000

3.0

3000

3.0

4.8

3500

3.5

3500

3.5

4.7

4000

4.0

4000

4.0

4.6

4500

4.5

4500

4.5

4.5 or less

5000

5.0

5000

5.0

****These are approximate recommendations based on the average ENP value of ag lime. An ENP of 1,000 lb. per ton is an average value for ag lime (crushed limestone) in Minnesota.

Boundaries Between Area l and Area 2

Area 1 = area in Minnesota that is EAST of the following counties: Roseau, Marshall, Pennington, Polk, Mahnomen, western two thirds of Becker and Ottertail, Douglas, Pope, Kandiyohi, Renville, Brown, Watonwan, and Martin. (Counties/areas listed and west are in Area 2)

Area 1 = most subsoils are acid.
Area 2 = few subsoils are acid.

To convert pounds ENP per acre recommendation to tons of ag-lime per acre use the following equation:

Lbs. ENP/Acre ¸ Ag-Lime Quality Rating (Minimum Lbs. ENP/Ton)

Example: 5,000 Lbs. ENP/Acre recommendation¸ 1,000 Min. Lbs. ENP/Ton = 5 Tons Ag-Lime/Acre

Sources

  1. Lime Needs In Minnesota, Minnesota Extension Bulletin FO-05956-GO, 1992, George Rehm, Robert Munter, Carl Rosen, and Michael Schmitt.
  2. Liming Minnesota Soils, Minnesota Extension Service Bulletin/Folder 210, 1978, John Grava, C. J. Overdahl, and W. E. Fenster.
MDA Contact

Ed Kaiser, Consultant
Ed.Kaiser@state.mn.us
651-201-6275
Pesticide & Fertilizer Management Division