Katlynn Weathers Soil 4213 April 10, 2013

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

 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

 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

Composite / Random Zone Grid

Field Border Grid Cell Sample ID #

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

Soil Test P Potassium pH

 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) $ $8.00

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

1. University of Missouri Extension 2. University of Nebraska Cooperative Extension olderId=506359&name=DLFE pdf 3. West Virgina University Extension Service wide_Project.pdf 4. University of Nebraska-Lincoln Clemson Extension /AGRO/IL63.pdf /AGRO/IL63.pdf