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

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 1997 - 2012.

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

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

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

  3. AGVISE Laboratories%Zone or Grid Samples – Northwood laboratory1997 - 2012 % Grid or Zone Samples Tested Compared To Conventional Whole Field Composite Samples Tested

  4. Average Soil Nitrate following Wheat in 2012 MB Fall 2012 Samples 44 (lb/a 0-24” samples) 48 43 65 38 64 41 42 33 47 47 44 44 ND 50 51 43 48 50 42 57 MN 50 67 SD 39 43

  5. Drought Average Soil Nitrate Following “WHEAT” in Canada 1986-2012 107 96 81 68 64 59 58 56 Nitrate-N (0-24”) lb/a 52 50 50 50 50 49 49 47 46 42 42 41 40 39 39 38 35 34 34 86 88 90 92 94 96 98 00 02 04 06 08 10 12

  6. Soil Nitrate Variability Between Fields Following “Wheat” in Canada - 2012

  7. Average Soil Nitrate following Canola in 2012 MB Fall 2012 Samples 43 (lb/a 0-24” samples) 63 54 72 47 74 50 75 49 46 40 ND 41 48 MN SD

  8. Soil Nitrate Variability Between Fields Following “Canola” in Canada – 2012

  9. Average Soil Nitrate Following “Canola” in Canada 1988-2012 82 75 60 60 58 57 57 54 53 51 49 45 44 44 43 Nitrate-N (0-24”) lb/a 40 40 37 36 36 35 34 32 32 29 88 90 92 94 96 98 00 02 04 06 08 10 12

  10. Soil Nitrate Variability Between Fields Following “Barley” in Canada - 2012

  11. Average Soil Nitrate Following “BARLEY in Canada 1986-2012 81 70 66 64 64 60 58 58 58 55 54 53 50 50 49 49 47 Nitrate-N (0-24”) lb/a 46 45 44 43 39 38 37 37 36 35 86 88 90 92 94 96 98 00 02 04 06 08 10 12

  12. Soil Nitrate Variability Between Fields Following “Flax” in Canada - 2012

  13. Average Soil Nitrate Following “FLAX in Canada 1988-2012 89 87 64 60 58 56 55 Nitrate-N (0-24”) 51 48 47 45 42 42 40 39 38 38 37 38 34 34 32 31 29 24 88 90 92 94 96 98 00 02 04 06 08 10 12

  14. Soil Nitrate Variability Between Fields Following “Potato” in Canada - 2012

  15. Average Soil Nitrate Following “POTATO” in Canada 1988-2012 106 96 93 92 81 81 79 74 73 72 72 70 69 68 67 Nitrate-N (0-24”) 62 61 55 54 54 51 50 46 34 39 88 90 92 94 96 98 00 02 04 06 08 10 2011

  16. Average Soil Nitrate following Corn in 2012 Fall 2012 samples MB (lb/a 0-24” samples) 89 63 113 54 67 46 50 ND 68 54 52 44 57 63 64 MN 77 56 SD 85 83 114 62

  17. Soil Nitrate Variability Between Fields Following “Corn” in Canada - 2012

  18. Average Soil Nitrate Following “CORN in Canada 1988-2012 117 106 96 93 90 84 85 85 80 77 Nitrate-N (0-24”) 71 65 64 65 64 63 60 59 58 55 54 54 54 45 42 88 90 92 94 96 98 00 02 04 06 08 10 12

  19. Soil Nitrate Variability Between Fields Following “Soybean” in Canada 2012

  20. Average Soil Nitrate Following “Soybeans” in Canada 2008 2009 2010 2011 2012 607 827 865 1350 1579 # of Fields Tested

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

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

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

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

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

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

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

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

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

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

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

  32. Manitoba - % Samples Testing with Salts greater than 1.0 582 NE ND R0G R0K 1:1 salt method – expressed as mmhos/cm

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

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