Our Logan Labs Target Values and some Yearly Limits



My desired CA:MG, based on TEC

68:12 - 8.5-20
67:13 - 8
66:14 - 7.5
65:15 - 7
64:16 - 6.5
63:17 - 6
62:18 - 5.75
61:19 - 5.5
60:20 - 5.35 or less

Target levels of macro minerals

Sulfur: 75 ppm
Phosphorus: 75 ppm
Calcium: 60-70%
Magnesium: 12-18%
Potassium: 3-5%

Target levels of trace elements

Boron: 3 ppm
Iron: 2x Mn
Manganese: 80-90 ppm
Copper: 4 ppm
Zinc: 8 ppm
Cobalt: 2 ppm
Molybdenum: 1 ppm
Selenium: 0.5 ppm
Aluminum < 200 ppm

Application limits

Gypsum: 2000 lbs
Boron: 2 lbs (actual)
Fe: 400 lbs (Iron Sulfate 24%)
Mn: 200 lbs (Manganese Sulfate 28%)
Cu: 35 lbs (Copper Sulfate 23%) [note: 10 lbs of 23% raises by 0.6 ppm]
Zn: 35 lbs (Zinc Sulfate 36%)

Cobalt: 4 lbs per acre of material (27% Co), up 0.54 ppm/year
Molybdenum: 0.5 lb/acre actual, up 0.25 ppm/yr
Selenium: 0.25 lb/acre actual, up 0.125 ppm/yr

Cobalt Sulfate (27%) 1.5 oz/ 1,000 sq ft, 4 lbs per acre
Sodium Molybdate (5%) 3.5 oz/ 1,000 sq ft, 10 lbs per acre
Sodium Selenate (6%) 1.5 oz/ 1,000 sq ft, 4 lbs per acre

Guidelines for Saturated Paste Test

pH: 6.2
Sulfur: 5 ppm
Phosphorus: 0.4 ppm
Calcium: 25-30 ppm/60%
Magnesium: 5-6 ppm/20%
Potassium: 12-15 ppm/15%
Sodium: <4-5 ppm
Boron: 0.08 ppm
Manganese: 0.10 < 0.25 ppm
Copper: 0.07 ppm
Zinc: 0.10 ppm