1. Katlynn Weathers Soil 4213 April 10, 2013

2.  What is precision agriculture?  What makes it so special?  How can grid soil sampling help?

3.  Purpose of Soil Sampling (Why) Determine fertilizer and lime needs Influence management decisions * Too much fertilizer reduced nutrient use efficiency * Not enough fertilizer will hurt yields

4.  Previous management Significantly altered soil nutrient levels Confined livestock areas Unknown management practices from previous years Desire for more information  Smaller fields merged into one

5. ........................................................................................... Composite / Random Zone Grid

6. 123456 789101112 131415161718 192021222324 252627282930 313233343536 373839404142 434445464748 Field Border Grid Cell Sample ID #

7. ................ Center of Grid Samplepoints W/ in Grid Cell........................ Center of Grid

9. Soil Test P Potassium pH http://extension.missouri.edu/p/WQ450

10.  How will you use this information??? Layering  Prices in Oklahoma Flat rate per acre (Central OK) $4.50 -$5.50 VRT per acre (Northern OK) $6.00 - $8.00

11. Advantages  More accurate  Layering of data  Nutrients  Has the potential to save money and increase yields* Disadvantages  Cost  Time  Not ideal for all locations  Specialized equipment

13. 1. University of Missouri Extension http://extension.missouri.edu/p/WQ450 2. University of Nebraska Cooperative Extension http://cropwatch.unl.edu/c/document_library/get_file?f olderId=506359&name=DLFE-12661.pdf 3. West Virgina University Extension Service http://www.wvu.edu/~agexten/forglvst/Precision_State wide_Project.pdf 4. University of Nebraska-Lincoln http://cropwatch.unl.edu/web/ssm/soilsampling http://cropwatch.unl.edu/web/ssm/soilsampling 5. Clemson Extension http://virtual.clemson.edu/groups/psapublishing/Pages /AGRO/IL63.pdf http://virtual.clemson.edu/groups/psapublishing/Pages /AGRO/IL63.pdf