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

AGVISE Laboratories % Zone or Grid Samples Tested Compared to Conventional Whole Field Composite Samples in 2012

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

Average Soil Nitrate following Wheat in 2012 Fall 2012 Samples (lb/a 0-24 samples) MB ND SD MN

Soil Nitrate Variability Between Fields Following WHEAT in 2012

Average Soil Nitrate Following WHEAT Years of history! Nitrate-N (0-24)

Average Soil Nitrate Following Wheat For Region ( ) Deep N (24-48 lb/a) Nitrate-N (24-48 lb/a)

Soil Nitrate Variability Between Fields Following Barley in 2012

Average Soil Nitrate Following BARLEY Nitrate-N (0-24 lb/a)

Soil Nitrate Variability Between Fields Following Sunflower in 2012

Average Soil Nitrate Following SUNFLOWER Nitrate-N (0-24 lb/a)

Soil Nitrate Variability Between Fields Following Dry Beans 2012

Average Soil Nitrate Following DRY BEANS Nitrate-N (0-24 lb/a)

Soil Nitrate Variability Between Fields Following Sugarbeet in 2012

Average Soil Nitrate Following SUGARBEET Nitrate-N (0-24 lb/a)

Soil Nitrate Variability Between Fields Following Fallow in 2012

Average Soil Nitrate Following FALLOW Nitrate-N (0-24 lb/a)

Soil Nitrate Variability Between Fields Following Soybeans in 2012

Average Soil Nitrate Following Soybeans Nitrate-N (0-24 lb/a)

Average Soil Nitrate following Corn in 2012 Fall 2012 samples (lb/a 0-24 samples) MB ND SD MN

Soil Nitrate Variability Between Fields Following Corn in 2012

56% 55% 66% 47% 68% 57% 78% 77% 69% 72% 34% 14% 20% 58% 50% 27% 60% % Soil Samples with Phosphorus less than 10 ppm Fall 2012 samples (0-6 samples) MB ND SD MN 38% (Olsen P test) 35% 67% 32% 36% 50% 46% 60% 57%47% 71% 36%

21% 14% 3% 6% 7% 2% 48% 36% 17% 30% 32% 38% 11% 6% % Soil Samples with Potassium less than 150 ppm Fall 2012 samples (0-6 samples) MB ND SD MN 32% 11% 48% 21% 5% 35% 41% 31% 23% 4%1% 78% 77% 19%

65% 56% 72% 54% 77% 86% 83% 65% 78% 35% 24% 35% 32% 59% 53% 49% 66% % Soil Samples with Zinc less than 1.0 ppm Fall 2012 samples (0-6 samples) MB ND SD MN 34% 35% 26% 59% 20% 36% 50% 49% 74% 91% 22% 44% 65%

8% 14% 18% 49% 40% 54% 22% 21% 9% 12% 10% 5% 9% 7% 11% 15% 12% % Soil Samples with Sulfur less than 15 lb/a Fall 2012 samples (0-6 samples) MB ND SD MN 10% 46% 49% 69% 27% 38% 32% 44% 29% 19% 20% 59% 67%

26% 22% 33% 25% 38% 60% 71% 43% 28% 21% 25% 17% 33% 8% 20% 29% % Soil Samples with %OM less than 3.0% Fall 2012 Samples (0-6 samples) MB ND SD MN 9% 3% 9% 75% 26% 17% 9% 28% 26% 55% 12% 26% 13%

48% 38% 56% 59% 87% 85% 89% 65% 84% 41% 20% 77% 70% 57% 44% 30% 47% 13% 78% 55% 42% 59% % Soil Samples with Chloride less than 40 lb/a Fall 2012 Samples (0-24 samples) MB ND SD MN 51% 78% 85% 34% 57% 63%

12% 17% 7% 13% 10% 2% 1% 4% 20% 29% 26% 5% 0% 2% 5% 16% 14% 26% 24% 10% 12% % Soil Samples with Copper less than 0.5 ppm Fall 2012 samples (0-6 samples) MB ND SD MN 15% 7% 10% 5% 14% 45% 41% 4%

3% 7% 5% 2% 15% 2% 39% 5% 1% 13% 4% 1% 8% 2% % Soil Samples with Boron less than 0.4 ppm Fall 2012 samples (0-6 samples) MB ND SD MN 1% 9% 47% 75% 17% 9%8% 12% 9% 35% 27% 4% 0%

65% 76% 70% 38% 35% 39% 62% 51% 25% 54% 79% 96% 43% 36% 22% 23% 75% 72% 74% 82% 42% 71% % Soil Samples with Soil pH greater than 7.3 Fall 2012 samples (0-6 samples) MB ND SD MN 65% 27% 34% 23% 15% 6% 67% 92% 84%

12% 26% 10% 6% 7% 10% 29% 23% 44% 4% 9% 2% 17% 40% 22% 14% 10% % Soil Samples with Carbonate greater than 5.0% Fall 2012 samples (0-6 samples) MB ND SD MN 36% 1% 10% 24% 55% 13% 3% 1% 3% 9% 6%

27% 37% 15% 10% 1% 4% 2% 8% 1% 4% 19% 3% 11% 2% 21% 17% 12% 23% 17% 8% 10% % Soil Samples with Salts greater than 1.0 Fall 2012 Samples (0-6 samples) MB ND SD MN 11% 12% 7% 6% 2% 0% 6% 17% 21%

North Dakota & NW Minnesota % Samples Testing with Salts greater than 1.0 1:1 salt method – expressed as mmhos/cm 582 Grand Forks 567 TRF 587 Minot

South Dakota - % Samples Testing with Salts greater than 1.0 1:1 salt method – expressed as mmhos/cm 572 – Watertown 573 – Huron 574 – Aberdeen 583 – Grand Forks

The Salt Problem may be Worse than this? Composite samples –Avoid areas that dont represent most of the field Saline areas Sandy ridges Many salty fields dont get tested Zone sampling –The salty zones often do not get tested or fertilized