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 2014

%Zone or Grid Samples – Northwood laboratory 1997 - 2014 % Grid or Zone Samples Tested Compared To Conventional Whole Field Composite Samples Tested

39 30 58 47 31 Average Soil Nitrate following Wheat in 2014 Fall 2014 samples (lb/a 0-24” samples) 39 30 58 47 31

Soil Nitrate Variability Between Fields Following “WHEAT” in Montana - 2014

Average Soil Nitrate following Wheat in 2014 MB Fall 2014 Samples 31 35 (lb/a 0-24” samples) 33 39 21 39 36 41 35 32 33 37 30 ND 32 33 32 27 24 26 39 MN 34 37 SD 51 32

46 58 41 52 37 Average Soil Nitrate following “Fallow” in 2014 Fall 2014 samples (lb/a 0-24” samples) 46 58 41 52 37

Soil Nitrate Variability Between Fields Following “Fallow” in Montana - 2014

% Soil Samples with Phosphorus less than 10 ppm Fall 2014 samples (0-6”) (Olsen P test) 36% 52% 34% 50% 39% 21%

15% 8% 1% 16% 9% 4% % Soil Samples with Potassium less than 150 ppm Fall 2014 samples (0-6”) 15% 8% 1% 16% 9% 4%

88% 75% 74% 51% 41% 37% % Soil Samples with Zinc less than 1.0 ppm Fall 2014 samples (0-6”) 88% 75% 74% 51% 41% 37%

58% 51% 49% 30% 27% 39% % Soil Samples with Sulfur less than 15 lb/a Fall 2014 samples (0-6”) 58% 51% 49% 30% 27% 39%

1% 5% 1% 2% 2% 1% % Soil Samples with Copper less than 0.5 ppm Fall 2014 samples (0-6”) 1% 5% 1% 2% 2% 1%

14% 10% 5% 5% 4% 2% % Soil Samples with Boron less than 0.4 ppm Fall 2014 samples (0-6”) 14% 10% 5% 5% 4% 2%

% Soil Samples with Chloride less than 40 lb/a Fall 2014 samples (0-6”) 879% 64% 71% 48% 52% 56%

6% 15% 27% 14% 4% 51% % Soil Samples with Carbonate greater than 5.0% Fall 2014 samples (0-6”) 6% 15% 27% 14% 4% 51%

2% 3% 3% 7% 5% 2% % Soil Samples with Salts greater than 1.0 mmhos/cm Fall 2014 samples (0-6”) 2% 3% 3% 7% 5% 2%

59% 74% 72% 82% 87% 69% % Soil Samples with soil pH greater than 7.3 Fall 2014 samples (0-6”) 59% 74% 72% 82% 87% 69%

4% 4% 3% 2% 1% 2% % Soil Samples with soil pH less than 6.0 Fall 2014 samples (0-6”) 4% 4% 3% 2% 1% 2%

95% 80% 69% 78% 86% 53% % Soil Samples with %OM less than 3.0% Fall 2014 samples (0-6”) 95% 80% 69% 78% 86% 53%

Zip codes for Montana 599 595 592 594 598 596 593 590-591 597