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Soil Testing Trends: Zone or Grid Samples Compared to Conventional Samples

This study compares the testing of zone or grid samples to conventional whole field composite samples for various crops in Canada from 1986 to 2016. The variability of soil nitrate, phosphorus, potassium, zinc, sulfur, organic matter, chloride, copper, boron, soil pH, carbonate, and salts is analyzed. Manitoba samples testing with salts greater than 1.0 mmhos/cm are also included.

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Soil Testing Trends: Zone or Grid Samples Compared to Conventional Samples

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

  2. %Zone or Grid Samples Tested Compared to Conventional Whole Field Composite Samples in 2016

  3. AGVISE Laboratories%Zone or Grid Samples – Northwood laboratory1997 - 2016 % Grid or Zone Samples Tested Compared To Conventional Whole Field Composite Samples Tested

  4. Average Soil Nitrate following Wheat in 2016 MB Fall 2016 Samples 37 (lb/a 0-24” samples) 36 37 32 45 19 45 39 43 30 38 34 36 36 ND 43 60 41 45 45 49 55 MN 44 42 SD 43 50

  5. Average Soil Nitrate Following “Wheat” in Canada1986 - 2016 Nitrate-N (0-24” lb/a)

  6. Soil Nitrate Variability Between Fields Following “Wheat” in Canada – 2016

  7. Average Soil Nitrate following Canola in 2016 MB Fall 2016 Samples 38 (lb/a 0-24” samples) 42 47 31 50 23 46 42 48 39 27 33 ND 38 29 MN SD

  8. Average Soil Nitrate Following “Canola”1986 - 2016 Nitrate-N (0-24” lb/a)

  9. Soil Nitrate Variability Between Fields Following “Canola” in Canada – 2016

  10. Average Soil Nitrate Following “Barley” in Canada1986 - 2016 Nitrate-N (0-24” lb/a)

  11. Soil Nitrate Variability Between Fields Following “Barley” in Canada - 2016

  12. Soil Nitrate Variability Between Fields Following “Potato” in Canada - 2016

  13. Average Soil Nitrate Following “Potato” in Canada1986 - 2016 Nitrate-N (0-24” lb/a)

  14. Average Soil Nitrate following Corn in 2016 Fall 2016 samples MB (lb/a 0-24” samples) 28 47 41 53 37 51 ND 50 53 61 48 52 60 101 75 MN 51 SD 63 37 33 53

  15. Average Soil Nitrate Following “Corn” in Canada1988 - 2016 Nitrate-N (0-24” lb/a)

  16. Soil Nitrate Variability Between Fields Following “Corn” in Canada - 2016

  17. Average Soil Nitrate following Soybean in 2016 Fall 2016 samples MB 23 (lb/a 0-24” samples) 30 29 25 36 28 38 35 29 24 29 25 31 ND 27 29 28 22 27 32 MN 30 28 SD 31 30 24 27

  18. Average Soil Nitrate Following “Soybeans”1995 - 2016 Nitrate-N (0-24” lb/a)

  19. Soil Nitrate Variability Between Fields Following “Soybean” in Canada 2016

  20. % Soil Samples with Phosphorus less than 10 ppm Fall 2016 samples MB 39% (0-6” samples) 39% (Olsen P test) 55% 60% 14% 73% 31% 21% 23% 71% 67% 71% 47% 54% 69% ND 45% 48% 59% 51% 62% 26% 61% MN 38% 50% 37% SD 41% 39% 49% 37% 35%

  21. % Soil Samples with Potassium less than 150 ppm MB Fall 2016 samples 25% 13% (0-6” samples) 26% 26% 21% 6% 13% 26% 10% 5% 4% 1% 13% 72% 36% ND 8% 19% 59% 5% 41% 5% 46% 2% 5% 32% MN 33% SD 43% 1% 5% 35% 43%

  22. % Soil Samples with Zinc less than 1.0 ppm MB Fall 2016 samples 47% 58% (0-6” samples) 62% 52% 26% 76% 44% 33% 31% 73% 81% 82% 41% 65% 34% ND 49% 70% 21% 77% 53 58% 19% 75% 44% MN 51% 27% SD 44% 57% 43% 38% 26%

  23. % Soil Samples with Sulfur less than 15 lb/a MB Fall 2016 samples 16% 23% (0-6” samples) 16% 12% 9% 20% 25% 16% 16% 49% 21% 27% 13% 52% 21% ND 32% 76% 21% 40% 43% 52% 80% 49% MN 67% 34% 65% SD 90% 88% 68% 44% 68%

  24. % Soil Samples with %OM less than 3.0% MB Fall 2016 Samples 8% 10% (0-6” samples) 21% 11% 34% 22% 34% 25% 24% 71% 33% 45% 26% 28% 37% ND 30% 60% 76% 29% 27% 35% 25% 55% MN 28% 13% 10% SD 9% 29% 4% 25% 7%

  25. % Soil Samples with Chloride less than 40 lb/a MB Fall 2016 Samples 44% (0-24” samples) 39% 42% 63% 24% 80% 55% 41% 37% 84% 61% 69% 67% 45% 75% ND 64% 85% 59% 54% 86% 92% 90% 52% MN 62% 86% SD 61% 83% 75%

  26. % Soil Samples with Copper less than 0.5 ppm MB Fall 2016 samples 12% 7% (0-6” samples) 28% 5% 31% 17% 18% 22% 16% 6% 15% 3% 23% 36% 36% ND 11% 56% 10% 30% 15% 14% 34% 16% 7% MN 6% 10% SD 6% 4% 6% 1%

  27. % Soil Samples with Boron less than 0.4 ppm MB Fall 2016 samples 2% (0-6” samples) 1% 3% 1% 6% 2% 9% 11% 2% 3% 2% 4% 7% 27% 8% ND 4% 17% 34% 84% 4% 11% 57% 16% 13% 9% MN 14% SD 10% 36% 9% 11% 37%

  28. % Soil Samples with Soil pH greater than 7.3 MB Fall 2016 samples 62% 94% (0-6” samples) 79% 72% 91% 69% 57% 78% 73% 72% 75% 54% 73% 45% 96% ND 43% 8% 64% 43% 78% 27% 47% 11% 17% MN 40% 55% SD 43% 30% 16% 28% 21%

  29. % Soil Samples with Soil pH less than 6.0 MB Fall 2016 samples 2% 0% (0-6” samples) 4% 4% 0% 1% 15% 7% 1% 2% 1% 4% 6% 11% 1% ND 14% 34% 3% 16% 4% 13% 16% 17% 16% MN 13% 9% 19% SD 16% 43% 35% 18% 10%

  30. % Subsoil Samples with pH less than 7.0 MB Fall 2016 samples 2% 1% (0-6” samples) 4% 3% 0% 2% 16% 3% 1% 1% 1% 1% 3% 5% 1% ND 3% 52% 2% 5% 1% 6% 9% 17% 9% MN 13% 3% 3% SD 29% 19% 10% 6% 19%

  31. % Soil Samples with Carbonate greater than 5.0% MB Fall 2016 samples 30% (0-6” samples) 56% 25% 22% 19% 2% 14% 33% 8% 11% 7% 4% 17% 24% 5% ND 9% 11% 11% 26% 4% 10% 0% 1% MN 12% 26% SD 4% 10% 2% 1%

  32. % Soil Samples with Salts greater than 1.0 MB Fall 2016 Samples 18% (0-6” samples) 13% 20% 19% 8% 4% 20% 12% 3% 15% 8% 24% 11% 6% ND 12% 4% 3% 19% 7% 2% 3% 19% MN 8% 3% SD 1% 1% 2% 9% 2%

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

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