Magruder Check Sample: 2016 Year End Summary

Magruder Check Sample: 2016 Year End Summary

14 Samples in 2016 Sample Sample Name # Tests 160111 Micro Mix 455 160211 Grade 24-25-4 595 160311 Grade 5-2-0 546 160411 Liquid Thio S 259 160511 Urea 149 160512 Micros 496 160611 WS 25-5-15 712 160711 12-12-12 Micros 817 160811 Liquid Organic 662 160911 MAP 497 161011 MOP 170 161012 ZnSO4 302 161111 Grade 32-0-10 407 161211 MAP plus S 545 0 100 200 300 400 500 600 700 800

Z-Cut Homogeneity Screening Sample Number Homogeneity Decision Pass Z Cut < 3%RSD Number of Pairs in Z Cut % Nitrogen 160111 Low n 13.0% 2 0.12 160211 PASS 1.0% 35 24.66 160311 Low *PASS Nitrogen 2.6% 37 5.47 160411 Low n 109.1% 3 0.08 160511 PASS 0.3% 37 46.26 160512 Low n 3.5% 5 2.49 160611 FAIL 10.3% 32 24.03 160711 PASS 0.0% 42 12.44 160811 Low *PASS Nitrogen 4.5% 35 5.18 160911 PASS 2.5% 34 11.01 161011 Low n 39.6% 2 0.03 161012 Low n 0.0% 5 2.84 161111 PASS 0.7% 37 32.43 161211 PASS 0.0% 40 12.09

2016 Z-Score Compliance 2016 6,612 Tests -4-3 -2-1 0 1 2 3 4 Action -3 > Z > 3 Warning Compliant -2 < Z < 2 Analyte 6.6% 4.4% 89.0% (419) (281) (5,689) Method 4.0% 2.7% 93.3% (217) (150) (5,123) Standard Normal 0.27% 4.28% 95.45%

2016 Labs Separated by Group International Private Public Number Labs Listed 44 41 44 Number Participating 42 32 37 Number of Individual Analytes 44 42 39 Number of Individual Methods 165 136 139 Z-Score Compliance Action -3 > Z > 3 7.0% 7.9% 5.0% Warning 4.8% 5.0% 3.5% Compliant -2 < Z < 2 88.2% 87.1% 91.5%

2016 Z-Score Compliance in Lab Groups N P K International Action 10.6% 4.5% 5.4% Private Public Warning 7.8% 4.1% 2.5% Compliant 81.6% 91.4% 92.1% Action 4.3% 9.1% 9.0% Warning 4.8% 3.8% 6.6% Compliant 90.9% 87.0% 84.3% Action 3.0% 7.9% 4.6% Warning 3.4% 3.9% 4.6% Compliant 93.7% 88.2% 90.9%

2016 N, P, K Participation by Lab Groups (# Tests) Code Analyte International Private Public 010 Total Nitrogen (%) 218 186 269 020 Total Phosphorus as P2O5 (%) 210 199 257 041 Direct Available Phosphorus as P2O5 050 Soluble Potassium as K2O (%) 204 169 242

# Tests 0 100 200 300 400 500 600 700 800 Ammoniacal Nitrogen (%) Nitrate Nitrogen (%) Water Insoluble Nitrogen (%) 2016 Analyte: N, P, K Urea Nitrogen (%) Biuret Nitrogen (%) Urea (%) Biuret (%) Number of Tests Ammoniacal Plus Nitrate Nitrogen (%) Total Nitrogen (%) Total Phosphorus as P2O5 (%) Citrate Insoluble Phosphorus as P2O5 (%) Indirect Available Phosphorus as P2O5 (%) Direct Available Phosphorus as P2O5 (%) Water Soluble Orthophosphate as P2O5 (%) Water Soluble Phosphorus as P2O5 (%) Soluble Potassium as K2O (%)

# Tests 0 20 40 60 80 100 120 140 160 180 200 220 240 260 280 Ammoniacal Nitrogen (%) 2016 Analyte: N, P, K by Group Nitrate Nitrogen (%) Water Insoluble Nitrogen (%) Urea Nitrogen (%) Biuret Nitrogen (%) Urea (%) Biuret (%) International Private Public Ammoniacal Plus Nitrate Nitrogen (%) Total Nitrogen (24%) Total Phosphorus as P2O5 (%) Citrate Insoluble Phosphorus as P2O5 (%) Indirect Available Phosphorus as P2O5 (5%) Direct Available Phosphorus as P2O5 (25%) Water Soluble Orthophosphate as P2O5 (%) Water Soluble Phosphorus as P2O5 (%) Soluble Potassium as K2O (4%)

# Tests 0 100 200 300 400 500 600 2016 Analyte: Other Elements Water (Free) (%) Acid Soluble Calcium (%) Acid Soluble Magnesium (%) Water Soluble Magnesium (%) Elemental Sulfur (%) Sulfate Sulfur, HCl soluble (%) Total Sulfur in Liquid (%) Total Sulfur in Urea/Formulations (%) Total Sulfur (%) Sulfur - HNO3 soluble (%) Acid Soluble Arsenic (ppm) Acid Soluble Boron (%) Water Soluble Boron (%) Acid Soluble Cadmium (ppm) Water Soluble Chlorine (%) Acid Soluble Chromium (ppm) Acid Soluble Cobalt (ppm) Acid Soluble Copper (%) Acid Soluble Iron (%) Acid Soluble Lead (ppm) Acid Soluble Manganese (%) Water Soluble Manganese (%) Acid Soluble Mercury (ppm) Acid Soluble Molybdenum (ppm) Acid Soluble Nickel (ppm) Acid Soluble Selenium (ppm) Sodium (%) Acid Soluble Zinc (%) Water Soluble Zinc (%) Number of Tests

# Tests 0 20 40 60 80 100 120 140 160 180 2016 Analyte: Other Elements by Group Water (Free) (%) Acid Soluble Calcium (%) Acid Soluble Magnesium (%) Water Soluble Magnesium (%) Elemental Sulfur (%) Sulfate Sulfur, HCl soluble (%) Total Sulfur in Liquid (%) Total Sulfur in Urea/Formulations (%) Total Sulfur (%) Sulfur - HNO3 soluble (%) Acid Soluble Arsenic (ppm) Acid Soluble Boron (%) Water Soluble Boron (%) Acid Soluble Cadmium (ppm) Water Soluble Chlorine (%) Acid Soluble Chromium (ppm) Acid Soluble Cobalt (ppm) Acid Soluble Copper (%) Acid Soluble Iron (%) Acid Soluble Lead (ppm) Acid Soluble Manganese (%) Water Soluble Manganese (%) Acid Soluble Mercury (ppm) Acid Soluble Molybdenum (ppm) Acid Soluble Nickel (ppm) Acid Soluble Selenium (ppm) Sodium (%) Acid Soluble Zinc (%) Water Soluble Zinc (%) International Private Public 184

2016 Methods: Nitrogen # Tests 0 20 40 60 80 100 120 140 160 180 200 Ammoniacal Nitrogen, Magnesium Oxide Method (%) Ammoniacal Nitrogen, Other (%) Nitrate Nitrogen, Robertson (%) Nitrate Nitrogen, Jones Modified (%) Nitrate Nitrogen, Other (%) Water Insoluble Nitrogen, Method I (%) Water Insoluble Nitrogen, Other (%) Urea Nitrogen, Urease (as N) (%) Urea Nitrogen, Other (%) Biuret Nitrogen, Spectrophotometric (as N) (%) Biuret Nitrogen, Other (%) Urea, Urease (as Urea) (%) Urea, Other (%) Biuret, Spectrophotometric (as Biuret) (%) Biuret, Other (%) Ammoniacal Plus Nitrate Nitrogen, Devarda (%) Ammoniacal Plus Nitrate Nitrogen, Other (%) Total Nitrogen, Modified Comprehensive (%) Total Nitrogen, Salicylic (%) Total Nitrogen, Raney (%) Total Nitrogen, Comprehensive (%) Total Nitrogen, Combustion (%) Total Nitrogen, Other (%) Number of Tests 521

2016 Methods by Group: Nitrogen 0 10 20 30 40 50 60 Ammoniacal Nitrogen, Magnesium Oxide Method Ammoniacal Nitrogen, Other Nitrate Nitrogen, Robertson Nitrate Nitrogen, Jones Modified Nitrate Nitrogen, Other Water Insoluble Nitrogen, Method I Water Insoluble Nitrogen, Other Urea Nitrogen, Urease (as N) Urea Nitrogen, Other Biuret Nitrogen, Spectrophotometric (as N) Biuret Nitrogen, Other Urea, Urease (as Urea) Urea, Other Biuret, Spectrophotometric (as Biuret) Biuret, Other Ammoniacal Plus Nitrate Nitrogen, Devarda Ammoniacal Plus Nitrate Nitrogen, Other Total Nitrogen, Modified Comprehensive Total Nitrogen, Salicylic Total Nitrogen, Raney Total Nitrogen, Comprehensive Total Nitrogen, Combustion Total Nitrogen, Other International Private Public Note 58 Indecisions on Method to Use 92 170 251

2016 Methods: Phosphorus # Tests 0 20 40 60 80 100 120 140 Total Phosphorus as P2O5, Gravimetric Quinoli... (%) Total Phosphorus as P2O5, Spectrophotometric... (%) Total Phosphorus as P2O5, Alkalimetric Quinol... (%) Total Phosphorus as P2O5, Automated (%) Total Phosphorus as P2O5, ICP (%) Total Phosphorus as P2O5, Other (%) Citrate Insoluble Phosphorus as P2O5, Spectro... (%) Citrate Insoluble Phosphorus as P2O5, Automat... (%) Citrate Insoluble Phosphorus as P2O5, Other (%) Indirect Available Phosphorus as P2O5, Spectr... (%) Indirect Available Phosphorus as P2O5, Automa... (%) Indirect Available Phosphorus as P2O5, ICP (%) Indirect Available Phosphorus as P2O5, Other (%) Direct Available Phosphorus as P2O5, Gravimet... (%) Direct Available Phosphorus as P2O5, Gravimet... (%) Direct Available Phosphorus as P2O5, Spectrop... (%) Direct Available Phosphorus as P2O5, Spectrop... (%) Direct Available Phosphorus as P2O5, Automate... (%) Direct Available Phosphorus as P2O5, ICP (%) Direct Available Phosphorus as P2O5, ICP, Cit... (%) Direct Available Phosphorus as P2O5, Citrate-... (%) Direct Available Phosphorus as P2O5, Other (%) Water Soluble Orthophosphate as P2O5, Other (%) Water Soluble Phosphorus as P2O5, Gravimetric... (%) Water Soluble Phosphorus as P2O5, Spectrophot... (%) Water Soluble Phosphorus as P2O5, Automated (%) Water Soluble Phosphorus as P2O5, ICP (%) Water Soluble Phosphorus as P2O5, Other (%) Number of Tests

2016 Methods by Group: Phosphorus # Tests 0 10 20 30 40 50 60 70 Total Phosphorus as P2O5, Gravimetric Quinolinium MolybdoP Total Phosphorus as P2O5, Spectrophotometric MolybdovanadoP Total Phosphorus as P2O5, Alkalimetric Quinolinium MolybdoP Total Phosphorus as P2O5, Automated Note: International vs Private Total Phosphorus as P2O5, ICP Total Phosphorus as P2O5, Other Citrate Insoluble Phosphorus as P2O5, Spectrophotometric MolybdovanadoP Citrate Insoluble Phosphorus as P2O5, Automated, test portion 963.03 A-B International Private Public Citrate Insoluble Phosphorus as P2O5, Other Indirect Available Phosphorus as P2O5, Spectrophotometric Indirect Available Phosphorus as P2O5, Automated Note general lack of Interest! Indirect Available Phosphorus as P2O5, ICP Indirect Available Phosphorus as P2O5, Other

2016 Methods by Group: Phosphorus # Tests 0 10 20 30 40 50 60 70 Direct Available Phosphorus as P2O5, Gravimetric Quinolinium Direct Available Phosphorus as P2O5, Gravimetric Quinolinium, Citrate- EDTA Ext. Direct Available Phosphorus as P2O5, Spectrophotometric Direct Available Phosphorus as P2O5, Spectrophotometric, Citrate-EDTA Ext. International Private Public Direct Available Phosphorus as P2O5, Automated Direct Available Phosphorus as P2O5, ICP Direct Available Phosphorus as P2O5, ICP, Citrate-EDTA Ext. Note lack of International Interest! Direct Available Phosphorus as P2O5, Citrate-EDTA Ext. Direct Available Phosphorus as P2O5, Other Water Soluble Orthophosphate as P2O5, Other Water Soluble Phosphorus as P2O5, Gravimetric Quinolinium Water Soluble Phosphorus as P2O5, Spectrophotometric Water Soluble Phosphorus as P2O5, Automated Note lack of Public Lab Interest! Water Soluble Phosphorus as P2O5, ICP Water Soluble Phosphorus as P2O5, Other

2016 Methods: Potassium # Tests 0 50 100 150 200 250 Soluble Potassium as K2O, STPB Oxalate (%) Soluble Potassium as K2O, AA (Oxalate) (%) Soluble Potassium as K2O, AA (Citrate) (%) Number of Tests Soluble Potassium as K2O, AA (Citrate-EDTA) (%) Soluble Potassium as K2O, ICP (Oxalate) (%) Soluble Potassium as K2O, ICP (Citrate) (%) Soluble Potassium as K2O, ICP (Citrate-EDTA) (%) Soluble Potassium as K2O, Flame Photometric (... (%) This is a red flag Soluble Potassium as K2O, Flame Photometric (... (%) Soluble Potassium as K2O, Flame Photometric (... (%) Soluble Potassium as K2O, Other (%)

2016 Methods by Group: Potassium 0 20 40 60 80 100 Soluble Potassium as K2O, STPB Oxalate Soluble Potassium as K2O, AA (Oxalate) Soluble Potassium as K2O, AA (Citrate) International Private Public Soluble Potassium as K2O, AA (Citrate-EDTA) Soluble Potassium as K2O, ICP (Oxalate) Soluble Potassium as K2O, ICP (Citrate) Soluble Potassium as K2O, ICP (Citrate-EDTA) Soluble Potassium as K2O, Flame Photometric (Oxalate) Soluble Potassium as K2O, Flame Photometric (Citrate) Not sure of Methods To Use Soluble Potassium as K2O, Flame Photometric (Citrate- EDTA) Soluble Potassium as K2O, Other

Elemental Sulfur, Gravimetric Sulfur - carbon disulfide soluble sulfur 2016 Methods by Group: Sulfur 0 10 20 30 40 50 Elemental Sulfur, Other Sulfate Sulfur, HCl soluble, Gravimetric Sulfur - sulfate form Sulfate Sulfur, HCl soluble, Other International Private Public Total Sulfur in Liquid, Gravimetric - sulfate, sulfite, thiosulfate, and elemental Total Sulfur in Liquid, Other Total Sulfur in Urea/Formulations, Other (Identify) Total Sulfur, Combustion Total Sulfur, Gravimetric - sulfate and elemental Total Sulfur, ICP, w/br digestion Total Sulfur, ICP, test portion as in 2006.03 modified w/9:3 HNO3:HCl Total Sulfur, Other Note a lot of interest in OTHER! Sulfur - HNO3 soluble, ICP

2016 Methods by Group: Calcium # Tests 0 10 20 30 40 50 Acid Soluble Calcium, AA, inorganic 965.09 Acid Soluble Calcium, AA, 965.09, test portion 2006.03A-C w/dual acid International Private Public Acid Soluble Calcium, ICP, test portion inorganic 965.09 Acid Soluble Calcium, ICP, test portion 2006.03A-C Acid Soluble Calcium, ICP, test portion 2006.03A-C, w/dual acid Acid Soluble Calcium, Other

2016 Methods by Group: Magnesium 0 10 20 30 40 50 60 Acid Soluble Magnesium, AA, inorganic 965.09 Acid Soluble Magnesium, AA, 965.09, test portion 2006.03A-C w/dual acid International Private Public Acid Soluble Magnesium, ICP, test portion inorganic 965.09 Acid Soluble Magnesium, ICP, test portion 2006.03A- C Acid Soluble Magnesium, ICP, test portion 2006.03A- C, w/dual acid Acid Soluble Magnesium, Other Water Soluble Magnesium, AA Water Soluble Magnesium, ICP

2016 Methods by Group: Zinc 0 10 20 30 40 50 60 70 80 Acid Soluble Zinc, AA, inorganic 965.09 Acid Soluble Zinc, AA, organic 965.09 Acid Soluble Zinc, AA, 965.09, test portion 2006.03A-C w/dual acid International Private Public Acid Soluble Zinc, ICP, test portion inorganic 965.09 104 Acid Soluble Zinc, ICP, test portion 2006.03A-C Acid Soluble Zinc, ICP, test portion 2006.03A-C, w/dual acid Acid Soluble Zinc, Other Water Soluble Zinc, AA Water Soluble Zinc, ICP Water Soluble Zinc, Other

Performance Against Guarantee Sample Code Analyte Guarantee Measured Micro Mix 160111 Boron 1.50% 1.547 Copper 3% 3.942 Iron 18% 18.41 Manganese 7.50% 8.249 Molybdenum 200 ppm 195.2 Zinc 7% 8.163 Grade 24-25-4 160211 Nitrogen 24% 24.56 DA Phosphate 25% 24.81 Potassium 4% 4.131 Grade 5-2-0 160311 Nitrogen 5% 5.442 DA Phosphate 2% 4.231 Potassium 0% 0.3872 Liquid Thio S 160411 Potassium 25% 25.10% Total Sulfur 17% 17.04 Urea 160511 Nitrogen 46% 46.18 Micros 160512 Total Sulfur 9% 12.10 Boron 1% 1.048 Copper 1% 1.838 Manganese 4% 4.167 Zinc 20% 20.04

Performance Against Guarantee Sample Code Analyte Guarantee Measured WS 25-5-15 160611 Nitrogen 25.00% 24.23 DA Phosphate 5% 4.929 Potassium 15% 14.08 Magnesium 0.10% 0.270 Total Sulfur 0.13% 0.2055 Boron 0.025% 0.0226 Copper 0.0125% 0.0120 Iron 0.125% 0.1118 Manganese 0.063% 0.0529 Molybdenum 125 ppm 107.8 Zinc 0.063% 0.0574 12-12-12 Micros 160711 Nitrogen 12% 12.41 DA Phosphate 12% 12.39 Potassium 12% 12.26 Total Sulfur 9% 12.42 Boron 0.1% 0.1065 Copper 0.1% 0.1774 Iron 0.5% 0.9097 Manganese 0.4% 0.418 Molybdenum 250 ppm 9.214 Zinc 2% 2.013

Performance Against Guarantee Sample Code Analyte Guarantee Measured Liquid Organic 160811 Nitrogen 5% 5.185 DA Phosphate 20% 19.39 Potassium 4% 3.963 Magnesium 0.05% 0.1222 Boron 0.02% 0.0242 Iron 0.05% 0.16 Manganese 0.2% 0.2642 Molybdenum 30 ppm 34.88 Zinc 0.03% 0.0642 MAP 160911 Nitrogen 11% 10.97 DA Phosphate 52% 51.61 MOP 161011 Potassium 61% 60.62 Chlorine 47% 47.17 ZnSO4 161012 Total Sulfur 17% 16.22 Zinc 35% 33.27 Grade 32-0-10 161111 Nitrogen 32% 32.34 DA Phosphate 0% 0.0597 Potassium 10% 10.13 Iron 2% 0.00844 MAP plus S 161211 Nitrogen 12% 12.06 DA Phosphate 40% 41.4 Total Sulfur 10% 9.492 Only 9 Labs participated

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