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

Total Samples

0%10%20%30%40%50%60%70%80%90%

100%

2008 2009 2010 2011 2012 2013 2014 2015

% Z

one

or G

rid S

ampl

es

Overall MN SD ND MT MB

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

79%

34%

71%

21%

34%

63%

0%10%20%30%40%50%60%70%80%90%100%

MN ND SD MT MB Overall

AGVISE Laboratories%Zone or Grid Samples – Northwood laboratory

1997 - 2015

22%18%

14%15%11%

8%11%

15%11%

15% 16%

26%28%31% 33%

39%40%39% 41%

0%

10%

20%

30%

40%

50%

60%

70%

1997 1998 1999 2000 2001 2002 2003 2004 2005 2006 2007 2008 2009 2010 2011 2012 2013 2014 2015

% Grid or Zone Samples Tested Compared To Conventional Whole Field Composite Samples Tested

Fall 2015 samples

44

42

41

Average Soil Nitrate following Wheat in 2015

(lb/a 0-24” samples)

58

54

22%

35%

19%

10%

6%

8%

0% 10% 20% 30% 40% 50% 60%

0-20

21-40

41-60

61-80

81-100

>100

Nitr

ate

Cat

egor

y To

tal N

itrat

e 0-

24"

lb/a

% of Fields Testing in Each Category

Soil Nitrate Variability Between Fields Following “WHEAT” in Montana - 2015

36

4337

353334

38 36

38

43

55

41

46 4349

Average Soil Nitrate following Wheat in 2015

Fall 2015 Samples

(lb/a 0-24” samples)

MB

ND

SDMN29

41

2452

52 42

49

4847

Fall 2015 samples

59

52

62

Average Soil Nitrate following “Fallow” in 2015

(lb/a 0-24” samples)

45

53

7%

27%

32%

18%

9%

7%

0% 10% 20% 30% 40% 50% 60%

0-20

21-40

41-60

61-80

81-100

>100

Nitr

ate

Cat

egor

y To

tal N

itrat

e 0-

24"

lb/a

% of Fields Testing in Each Category

Soil Nitrate Variability Between Fields Following “Fallow” in Montana - 2015

% Soil Samples with Phosphorus less than 10 ppm

Fall 2015 samples (0-6”)

56%

56%

36%

35%

39%

(Olsen P test)

37%

% Soil Samples with Potassium less than 150 ppm

Fall 2015 samples (0-6”)

4%

15%

2%

2%

10%4%

% Soil Samples with Zinc less than 1.0 ppm

Fall 2015 samples (0-6”)

80%

54%

79%

87%

50%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%

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%

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%

4%

3%

5%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%

1%

1%

3%

0%14%

% Soil Samples with %OM less than 3.0%

Fall 2015 samples (0-6”)

78%

82%

71%

94%

80%42%

592

593

594

595

Zip codes for Montana

590-591

599

598

597

596