Trend for Precision Soil Testing % Zone or Grid Samples Tested compared to Total Samples

% Zone or Grid Samples Tested Compared to Conventional Whole Field Composite Samples in 2015

AGVISE Laboratories %Zone or Grid Samples – Northwood laboratory % Grid or Zone Samples Tested Compared To Conventional Whole Field Composite Samples Tested

Fall 2015 samples Average Soil Nitrate following Wheat in 2015 (lb/a 0-24” samples) 58 54

Soil Nitrate Variability Between Fields Following “WHEAT” in Montana

Average Soil Nitrate following Wheat in 2015 Fall 2015 Samples (lb/a 0-24” samples) MB ND SD MN

Fall 2015 samples Average Soil Nitrate following “Fallow” in 2015 (lb/a 0-24” samples) 45 53

Soil Nitrate Variability Between Fields Following “Fallow” in Montana

% Soil Samples with Phosphorus less than 10 ppm Fall 2015 samples (0-6”) 56% 36% 35% 39% (Olsen P test) 37%

% Soil Samples with Potassium less than 150 ppm Fall 2015 samples (0-6”) 4% 15% 2% 10% 4%

% Soil Samples with Zinc less than 1.0 ppm Fall 2015 samples (0-6”) 80% 54% 79% 87% 50%

% Soil Samples with Sulfur less than 15 lb/a Fall 2015 samples (0-6”) 53% 39% 53% 60% 24% 52%

% Soil Samples with Copper less than 0.5 ppm Fall 2015 samples (0-6”) 5% 4% 3% 1% 2%

% Soil Samples with Boron less than 0.4 ppm Fall 2015 samples (0-6”) 9% % 10% 24% 2% 8%

% Soil Samples with Chloride less than 40 lb/a Fall 2015 samples (0-6”) 70% 50% 76% 52% 63%

% Soil Samples with Carbonate greater than 5.0% Fall 2015 samples (0-6”) 17% 9% 20% 8% 55% 2%

% Soil Samples with Salts greater than 1.0 mmhos/cm Fall 2015 samples (0-6”) 3% 4% 3% 5%

% Soil Samples with soil pH greater than 7.3 Fall 2015 samples (0-6”) 76% 84% 72% 65% 90% 63%

% Soil Samples with soil pH less than 6.0 Fall 2015 samples (0-6”) 1% 3% 0% 14%

% Soil Samples with %OM less than 3.0% Fall 2015 samples (0-6”) 78% 82% 71% 94% 80% 42%

Zip codes for Montana