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GPS/GIS Applications in Agriculture

GPS/GIS Applications in Agriculture. Gary T. Roberson Agricultural Machinery Systems. Guidance Point Guidance Swath Guidance Control Variable rate application Variable depth tillage Variable irrigation. Mapping Soil properties Chemical Application Chemical Prescriptions

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GPS/GIS Applications in Agriculture

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  1. GPS/GIS Applications in Agriculture Gary T. Roberson Agricultural Machinery Systems

  2. Guidance Point Guidance Swath Guidance Control Variable rate application Variable depth tillage Variable irrigation Mapping Soil properties Chemical Application Chemical Prescriptions Tillage Maps Yield Mapping Pest Mapping Topographic Maps Planting Maps GPS/GIS Applications

  3. Field Mapping • Position data (georeference data) recorded at predetermined intervals. • Other data recorded manually or automatically by monitor, computer, or data logger. • Data displayed by geographic information system (GIS) in thematic map format.

  4. Soil Sampling • Georeferenced soil samples can be collected • Sampling Methods • Grid sampling: intensive sampling of entire field • Directed sampling: intensive sampling of particular target areas

  5. Grid Sampling • Data collected for each cell or point • Multiple samples combined into each cell or point sample

  6. Directed Sampling • Sampling zones established based on knowledge of field • GPS used to locate sample points. • Areas of interest intensely sampled, others lightly sampled

  7. Crop Maze Field Boundary, Vollmer Farm, Bunn, NC

  8. Crop Maze

  9. Crop Maze • 5 acre corn field • Creative minds • Sub meter DGPS • Field computer • Mapping software • 450 foot tall wolf

  10. Yield Maps • Record of spatial yield variability within a field or farm. • GPS data coupled with yield data to produce map. • Mechanically harvested • Hand harvested • Useful tool for decision making.

  11. Cotton Yield Map

  12. Field Scouting • Fields can be scouted for a variety of pests • Pest populations recorded on maps • Decision tools can be applied on a site specific basis

  13. Weed Map

  14. Variable Rate Control • Application rates designed for needs of small sections of a field • GPS determines position of equipment in the field • Computer controls use GPS data and prescription files to adjust rate

  15. PrescriptionMap

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