why grid sample

13611 B St Omaha, NE 68144 (402) 334-7770 www.midwestlabs.com

Why Grid Sample?Over the last two decades Midwest Laboratories has seen large increases in the number of soil samples submitted for nutrient analysis. GPS based grid and zone type sampling has been a major reason for this increase.

What is grid sampling?

Grid or zone based sampling uses global positioning information to break a field down into smaller management units. These grids or zones are typically 1 to 5 acres in size. A separate soil sample is taken from each of these areas. Samples are analyzed at Midwest Laboratories and a fertilizer prescription is developed to apply nutrients at rates that vary according to a map of these soil test values.

Why grid sample?

With the increased use of yield maps, growers can now see the variability of yields and, consequently, nutrient removal from area to area within their fields. This is a major reason for variable rate fertilizer application. Other reasons include:

1. Old building sites and livestock facilities are now included in cropped areas.

2. Smaller fields with different crop and fertilizer history are now combined into larger fields.

3. Irrigated and non-irrigated areas often require separate fertility rates.

4. There are different natural fertility levels and soil nutrient holding capabilities within the same field.

What a grower really wants to accomplish with grid or zone sampling is to identify areas that need additional fertility as well as those that do not. Fertilizer can then be applied accordingly. For example, an 80 acre field may

August 2013

have an average P1 Bray phosphorus value of 15 ppm and an average soil pH of 5.8, but the field has a 5 acre old building site and feed yard with a P1 Bray value of 80 ppm and a soil pH of 7.3. This same field also contains a low yielding area that has received the same broadcast fertilizer application as the rest of the field and now tests 32 ppm on the P1 Bray test. The fertilizer that would have been applied to the old building site, feed yard, and low yielding area in a broadcast program can now be applied in a higher yielding area of the field that only tests at a P1 Bray level of 12 ppm. A higher rate of lime can be applied to an area testing at a pH of 5.5 instead of applying it on the area with a pH of 7.3.

GPS based grid or zone type sampling and variable rate fertilizer prescriptions automate the fertilizing process. They can apply this logic across hundreds of separate areas in a field and come up with the optimal amount of fertilizer or lime to apply to each area.

August 2013

A Real World ExampleThe soil test values for an example field are shown on the next few pages. We've also included the mapped soil test values using software interpolation based off the analysis of the soil samples and their geo-referenced locations. On report # 12-331-0980, we see the average soil test Bray 1 Phosphorus (P) level is 19 ppm with the lowest testing area at 4 ppm and the highest at 207 ppm. A good composite sample of this field showing 19 ppm would call for a nutrient recommendation at or slightly above crop removal. A grid sample based recommendation would vary significantly across this field but would have approximately the same total amount of fertilizer applied. The same holds true for the potassium (K) test levels. The average value is 174 ppm with the lowest area tests at 89 ppm and with the highest at 691 ppm. The amount of potassium fertilizer applied should vary according to these differences.

August 2013

Midwest

13611 “B” Street Omaha, Nebraska 68144-3693 (402) 334-7770 FAX (402 334-9121www.midwestlabs.com

Our reports and letters are for the exclusive and confidential use of our clients and may not be reproduced in whole or in part, nor may any reference be madeto the work, the results, or the company in any advertising, news release, or other public announcements without obtaining our prior written authorization.

Laboratories Inc.®��

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NITRATE-N (FIA)

ORGANICMATTER

PHOSPHORUS PERCENT BASE SATURATION (COMPUTED)

P1

(WEAK BRAY)P

2(STRONG BRAY)

LABNUMBER

SAMPLEIDENTIFICATION

CATIONEXCHANGECAPACITY

C.E.C.

meq/100g

SOILpH1:1

OLSENBICARBONATE

K

POTASSIUM MAGNESIUM

Mg

CALCIUM

Ca

SODIUM

Na

pHNEUTRAL AMMONIUM ACETATE (EXCHANGEABLE)

%Mg

%Ca

%H

%Na

%K

BUFFERINDEX

ppm ppm ppm ppm ppm ppmpercent

SOIL ANALYSIS REPORT

REV. 12/03

ppm ppm ppmlbs/A lbs/Adepth

(in)depth

(in)depth

(in)lbs/A

Totallbs/A

ppm

EXCESSLIMERATE

SULFURS

ZINCZn

MANGANESEMn

IRONFe

COPPERCu

BORONB

SOLUBLESALTS

1:1

mmhos/cmppm ppm ppm ppm ppm ppm

ICAP

LABNUMBER SURFACE SUBSOIL 1 SUBSOIL 2

L.O.I.

P

12-331-0980Aug 30, 2013

Nov 26, 2012

STUART

H & S SOUTH

SOUTH FIELD

6647

YOUR NAME HEREJOHN DOE111 FIRST STYOUR TOWN NE 68144

The above analytical results apply only to the sample(s) submitted. Samples are retained a maximum of 30 days.

REPORT NUMBER

REPORT DATE

RECEIVED DATE

ACCOUNT

IDENTIFICATION

DTPA DTPA DTPA DTPA SORB. DTPA

1:7 1:7

*248*

*248*

PAGE 1/6

52158 1 2.5 9 15 148 274 2011 6.2 6.7 14.4 2.6 15.9 69.8 11.7

52158 8 1.40-6

52159 2 3.0 9 13 201 301 2162 5.5 6.5 18.7 2.8 13.4 57.8 26.0

52159 8 1.00-6

52160 3 2.5 4 9 125 399 2215 5.6 6.5 19.2 1.7 17.3 57.7 23.3

52160 9 0.60-6

52161 4 2.8 7 11 163 309 2036 5.7 6.6 16.7 2.5 15.4 61.0 21.1

52161 10 1.20-6

52162 5 2.0 10 21 174 478 2274 5.6 6.5 20.7 2.2 19.2 54.9 23.7

52162 13 0.40-6

52163 6 3.2 12 17 162 309 1860 5.5 6.5 16.6 2.5 15.5 56.0 26.0

52163 10 0.60-6

52164 7 2.4 9 24 150 477 2589 5.8 6.6 21.4 1.8 18.6 60.5 19.1

52164 13 0.60-6

52165 8 2.7 17 29 133 335 2021 5.5 6.5 17.9 1.9 15.6 56.5 26.0

52165 10 0.60-6

52166 9 2.9 12 24 123 404 2357 6.4 6.8 17.0 1.9 19.8 69.3 9.0

52166 9 2.20-6

52167 10 2.5 10 17 133 356 2073 6.1 6.7 15.9 2.1 18.7 65.2 14.0

52167 10 1.10-6

Midwest




�

�

NITRATE-N (FIA)

ORGANICMATTER


P1

(WEAK BRAY)P

2(STRONG BRAY)

LABNUMBER



C.E.C.

meq/100g

SOILpH1:1

OLSENBICARBONATE

K

POTASSIUM MAGNESIUM

Mg

CALCIUM

Ca

SODIUM

Na


%Mg

%Ca

%H

%Na

%K

BUFFERINDEX



REV. 12/03


(in)depth

(in)depth

(in)lbs/A

Totallbs/A

ppm

EXCESSLIMERATE

SULFURS

ZINCZn

MANGANESEMn

IRONFe

COPPERCu

BORONB

SOLUBLESALTS

1:1


ICAP


L.O.I.

P

12-331-0980Aug 30, 2013

Nov 26, 2012

STUART

H & S SOUTH

SOUTH FIELD

6647



REPORT NUMBER

REPORT DATE

RECEIVED DATE

ACCOUNT

IDENTIFICATION


1:7 1:7

*248*

*248*

PAGE 2/6

52168 11 2.9 10 18 117 313 1989 5.7 6.6 16.3 1.8 16.0 61.0 21.2

52168 11 0.70-6

52169 12 2.5 11 21 89 323 2056 5.7 6.6 16.7 1.4 16.1 61.6 20.9

52169 7 0.40-6

52170 13 2.7 13 21 144 421 2209 5.3 6.3 21.6 1.7 16.2 51.1 31.0

52170 12 1.10-6

52171 14 3.0 15 18 282 358 2314 5.6 6.5 20.0 3.6 14.9 57.9 23.6

52171 10 0.70-6

52172 15 2.7 10 13 224 347 2199 5.6 6.5 18.9 3.0 15.3 58.2 23.5

52172 9 1.00-6

52173 16 2.3 10 23 179 436 2966 6.4 6.7 20.8 2.2 17.5 71.3 9.0

52173 8 0.60-6

52174 17 2.9 13 15 174 417 2471 5.8 6.6 20.1 2.2 17.3 61.5 19.0

52174 10 0.80-6

52175 18 2.5 13 19 130 480 2399 5.8 6.6 20.1 1.7 19.9 59.7 18.7

52175 9 0.60-6

52176 19 3.2 14 18 163 350 2379 6.0 6.7 17.9 2.3 16.3 66.5 14.9

52176 7 1.40-6

52177 20 2.0 16 26 108 414 2045 6.0 6.7 16.5 1.7 20.9 62.0 15.4

52177 7 0.60-6

Midwest




�

�

NITRATE-N (FIA)

ORGANICMATTER


P1

(WEAK BRAY)P

2(STRONG BRAY)

LABNUMBER



C.E.C.

meq/100g

SOILpH1:1

OLSENBICARBONATE

K

POTASSIUM MAGNESIUM

Mg

CALCIUM

Ca

SODIUM

Na


%Mg

%Ca

%H

%Na

%K

BUFFERINDEX



REV. 12/03


(in)depth

(in)depth

(in)lbs/A

Totallbs/A

ppm

EXCESSLIMERATE

SULFURS

ZINCZn

MANGANESEMn

IRONFe

COPPERCu

BORONB

SOLUBLESALTS

1:1


ICAP


L.O.I.

P

12-331-0980Aug 30, 2013

Nov 26, 2012

STUART

H & S SOUTH

SOUTH FIELD

6647



REPORT NUMBER

REPORT DATE

RECEIVED DATE

ACCOUNT

IDENTIFICATION


1:7 1:7

*248*

*248*

PAGE 3/6

52178 21 3.0 18 21 152 324 1967 5.4 6.5 18.1 2.2 14.9 54.3 28.6

52178 9 0.60-6

52179 22 2.2 13 29 115 420 2275 6.0 6.7 17.9 1.6 19.6 63.5 15.3

52179 8 0.40-6

52180 23 2.0 8 18 103 435 2646 6.3 6.7 19.1 1.4 19.0 69.3 10.3

52180 10 0.20-6

52181 24 2.6 11 16 179 307 1985 5.2 6.2 19.7 2.3 13.0 50.4 34.3

52181 18 0.50-6

52183 25 2.7 14 19 186 425 2456 6.0 6.6 19.2 2.5 18.4 64.0 15.1

52183 11 1.00-6

52184 26 2.2 8 15 164 518 2647 5.8 6.5 22.2 1.9 19.4 59.6 19.1

52184 11 0.40-6

52185 27 2.4 13 20 175 509 2510 5.8 6.6 21.2 2.1 20.0 59.2 18.7

52185 10 0.70-6

52186 28 2.9 12 14 134 351 2015 5.7 6.6 16.8 2.0 17.4 60.0 20.6

52186 9 0.80-6

52187 29 2.9 13 16 146 370 2000 5.3 6.3 19.5 1.9 15.8 51.3 31.0

52187 11 1.40-6

52188 30 3.5 14 21 226 287 2181 5.7 6.6 17.6 3.3 13.6 62.0 21.1

52188 10 1.60-6

Midwest




�

�

NITRATE-N (FIA)

ORGANICMATTER


P1

(WEAK BRAY)P

2(STRONG BRAY)

LABNUMBER



C.E.C.

meq/100g

SOILpH1:1

OLSENBICARBONATE

K

POTASSIUM MAGNESIUM

Mg

CALCIUM

Ca

SODIUM

Na


%Mg

%Ca

%H

%Na

%K

BUFFERINDEX



REV. 12/03


(in)depth

(in)depth

(in)lbs/A

Totallbs/A

ppm

EXCESSLIMERATE

SULFURS

ZINCZn

MANGANESEMn

IRONFe

COPPERCu

BORONB

SOLUBLESALTS

1:1


ICAP


L.O.I.

P

12-331-0980Aug 30, 2013

Nov 26, 2012

STUART

H & S SOUTH

SOUTH FIELD

6647



REPORT NUMBER

REPORT DATE

RECEIVED DATE

ACCOUNT

IDENTIFICATION


1:7 1:7

*248*

*248*

PAGE 4/6

52189 31 3.1 11 15 210 299 2177 5.5 6.5 18.8 2.9 13.3 57.9 25.9

52189 10 1.20-6

52190 32 2.8 150 157 362 364 2238 5.7 6.6 19.2 4.8 15.8 58.3 21.1

52190 9 4.40-6

52191 33 3.3 207 208 691 337 3259 7.3 20.9 8.5 13.4 78.1 0.0

52191 10 16.90-6

52192 34 3.2 18 26 218 234 1851 5.6 6.6 15.4 3.6 12.7 60.1 23.6

52192 9 1.70-6

52193 35 2.9 7 8 169 347 2247 5.8 6.6 18.0 2.4 16.1 62.4 19.1

52193 9 1.30-6

52194 36 2.3 16 28 167 579 2941 5.8 6.5 24.7 1.7 19.5 59.5 19.3

52194 8 0.80-6

52195 37 2.8 11 16 188 379 2409 5.9 6.6 18.9 2.6 16.7 63.7 17.0

52195 8 0.40-6

52196 38 2.9 11 16 108 318 2218 5.7 6.6 17.7 1.6 15.0 62.7 20.7

52196 7 0.40-6

52197 39 2.8 16 23 117 332 2231 6.1 6.7 16.5 1.8 16.8 67.6 13.8

52197 7 1.00-6

52198 40 2.9 18 31 133 351 2404 6.5 6.8 16.5 2.1 17.7 72.8 7.4

52198 7 1.00-6

Midwest




�

�

NITRATE-N (FIA)

ORGANICMATTER


P1

(WEAK BRAY)P

2(STRONG BRAY)

LABNUMBER



C.E.C.

meq/100g

SOILpH1:1

OLSENBICARBONATE

K

POTASSIUM MAGNESIUM

Mg

CALCIUM

Ca

SODIUM

Na


%Mg

%Ca

%H

%Na

%K

BUFFERINDEX



REV. 12/03


(in)depth

(in)depth

(in)lbs/A

Totallbs/A

ppm

EXCESSLIMERATE

SULFURS

ZINCZn

MANGANESEMn

IRONFe

COPPERCu

BORONB

SOLUBLESALTS

1:1


ICAP


L.O.I.

P

12-331-0980Aug 30, 2013

Nov 26, 2012

STUART

H & S SOUTH

SOUTH FIELD

6647



REPORT NUMBER

REPORT DATE

RECEIVED DATE

ACCOUNT

IDENTIFICATION


1:7 1:7

*248*

*248*

PAGE 5/6

52199 41 2.9 13 19 148 370 2415 6.1 6.7 18.0 2.1 17.1 67.1 13.7

52199 10 0.90-6

52200 42 2.4 25 36 146 564 2985 5.9 6.6 24.1 1.6 19.5 61.9 17.0

52200 8 0.90-6

52201 43 3.1 16 22 184 361 2276 5.9 6.6 17.9 2.6 16.8 63.6 17.0

52201 9 0.90-6

52202 44 2.7 12 16 131 340 1914 5.7 6.6 16.1 2.1 17.6 59.4 20.9

52202 9 0.60-6

52203 45 3.5 26 41 209 252 1880 5.6 6.6 15.7 3.4 13.4 59.9 23.3

52203 9 1.50-6

52204 46 3.1 31 44 279 241 2086 5.9 6.7 15.9 4.5 12.6 65.6 17.3

52204 8 1.20-6

52205 47 3.1 18 26 207 347 2621 6.2 6.7 18.8 2.8 15.4 69.7 12.1

52205 9 1.00-6

52206 48 3.3 11 16 160 298 1998 5.8 6.6 15.9 2.6 15.6 62.8 19.0

52206 9 1.20-6

52207 49 2.3 13 25 125 483 2428 6.1 6.7 19.2 1.7 21.0 63.2 14.1

52207 8 0.70-6

52208 50 2.8 11 17 127 295 2155 5.9 6.6 16.4 2.0 15.0 65.7 17.3

52208 9 0.90-6

Midwest




�

�

NITRATE-N (FIA)

ORGANICMATTER


P1

(WEAK BRAY)P

2(STRONG BRAY)

LABNUMBER



C.E.C.

meq/100g

SOILpH1:1

OLSENBICARBONATE

K

POTASSIUM MAGNESIUM

Mg

CALCIUM

Ca

SODIUM

Na


%Mg

%Ca

%H

%Na

%K

BUFFERINDEX



REV. 12/03


(in)depth

(in)depth

(in)lbs/A

Totallbs/A

ppm

EXCESSLIMERATE

SULFURS

ZINCZn

MANGANESEMn

IRONFe

COPPERCu

BORONB

SOLUBLESALTS

1:1


ICAP


L.O.I.

P

12-331-0980Aug 30, 2013

Nov 26, 2012

STUART

H & S SOUTH

SOUTH FIELD

6647



REPORT NUMBER

REPORT DATE

RECEIVED DATE

ACCOUNT

IDENTIFICATION


1:7 1:7

*248*

*248*

PAGE 6/6

52209 51 2.4 7 18 125 383 2458 6.1 6.7 18.4 1.7 17.3 66.8 14.2

52209 12 0.90-6

52210 52 3.0 11 22 119 367 2704 7.0 16.9 1.8 18.1 80.1 0.0

52210 9 1.00-6

52211 53 2.7 11 18 181 375 3042 6.8 18.8 2.5 16.6 80.9 0.0

52211 8 0.60-6

52212 54 2.9 13 18 168 336 2989 6.6 6.8 19.4 2.2 14.4 77.0 6.4

52212 8 0.50-6

52213 55 2.9 32 54 165 411 2611 7.5 16.9 2.5 20.3 77.2 0.0

52213 9 1.20-6

52214 56 2.6 12 41 197 325 2785 7.0 17.1 3.0 15.8 81.2 0.0

52214 8 1.10-6

52215 57 2.4 12 24 181 472 3224 6.8 20.5 2.3 19.2 78.5 0.0

52215 8 0.70-6

52216 58 3.0 9 14 137 267 2747 6.9 16.3 2.2 13.7 84.1 0.0

52216 7 0.70-6

Field Imagery

Grower: StuartFarm: H & S SouthField: South FieldArea: 135.14 ac South Field (135.14 ac)

Soil Type

Grower: StuartFarm: H & S SouthField: South FieldArea: 135.14 ac Field Boundary

Soil TypeACKMORE-COLO-JUDSON COMPLEX, 0 TO 5PERCENT SLOPES (40.0 ac ) (29.6 %)EXIRA SILTY CLAY LOAM, 9 TO 14 PERCENTSLOPES, MODERATELY ERODE (59.7 ac ) (44.2 %)MARSHALL SILTY CLAY LOAM, 2 TO 5 PERCENTSLOPES (32.2 ac ) (23.8 %)SHELBY-ADAIR COMPLEX, 9 TO 14 PERCENTSLOPES, MODERATELY ERODED (3.2 ac ) (2.3 %)

Soil Test Points

Grower: StuartFarm: H & S SouthField: South FieldArea: 135.14 ac Field Boundary

Soil Test Points

pH

Grower: StuartFarm: H & S SouthField: South FieldArea: 135.14 ac

Season: 2013Min: 5.29 PH SCALEAvg: 5.97 PH SCALEMax: 7.47 PH SCALE

Field BoundarypH PH SCALE< 5.0 (0.0 ac ) (0.0 %)5.0 - 5.5 (3.6 ac ) (2.7 %)5.5 - 6.0 (86.9 ac ) (64.3 %)6.0 - 6.5 (27.2 ac ) (20.1 %)6.5 - 7.0 (14.2 ac ) (10.5 %)7.0 - 7.5 (3.2 ac ) (2.4 %)> 7.5 (0.0 ac ) (0.0 %)

P Bray 1


Season: 2013Min: 4.22 ppmAvg: 19.15 ppmMax: 196.41 ppm

Field BoundaryP Bray 1 ppm< 10 (24.6 ac ) (18.2 %)10 - 20 (93.3 ac ) (69.0 %)20 - 30 (6.7 ac ) (5.0 %)30 - 40 (1.9 ac ) (1.4 %)> 40 (8.6 ac ) (6.3 %)

K


Season: 2013Min: 93.72 ppmAvg: 174.03 ppmMax: 644.00 ppm

Field BoundaryK ppm< 125 (12.6 ac ) (9.3 %)125- 150 (41.8 ac ) (31.0 %)150 - 175 (41.2 ac ) (30.5 %)175 - 200 (18.9 ac ) (14.0 %)200 - 225 (7.3 ac ) (5.4 %)225 - 250 (3.8 ac ) (2.8 %)> 250 (9.6 ac ) (7.1 %)

OM


Season: 2013Min: 2.02 PercentAvg: 2.76 PercentMax: 3.49 Percent

Field BoundaryOM Percent< 1.5 (0.0 ac ) (0.0 %)1.5 - 2.0 (0.0 ac ) (0.0 %)2.0 - 2.5 (20.5 ac ) (15.2 %)2.5 - 3.0 (92.0 ac ) (68.1 %)3.0 - 3.5 (22.6 ac ) (16.8 %)> 3.5 (0.0 ac ) (0.0 %)

CEC


Season: 2013Min: 14.51 meq/100 gAvg: 18.42 meq/100 gMax: 24.37 meq/100 g

Field BoundaryCEC meq/100 g< 10 (0.0 ac ) (0.0 %)10 - 15 (0.5 ac ) (0.4 %)15 - 20 (115.9 ac ) (85.8 %)20 - 25 (18.7 ac ) (13.9 %)25 - 30 (0.0 ac ) (0.0 %)> 30 (0.0 ac ) (0.0 %)

why grid sample

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