understanding your site: consider what you can change and...
TRANSCRIPT
GIS AND MAPPING WATER NUTRIENTS TESTING CHEMISTRY SOILS PLANTS
Understanding Your Site: Consider what you can change and
what you can’t Joan R. Davenport
WSU-Prosser [email protected]
irrsoils.prosser.wsu.edu
Where Are You?
What Does Your AVA Tell You
• Very broad strokes • The bigger the AVA, the less valuable the
information it can provide to you • Great for marketing • Generalized variety choice information at
best
Exploring Your Site
• Make a Call – WSU V&E Extension - GIS Model – Consultant
• Do It Yourself
– Web Soil Survey – Soil Web and Soils on GMAPS – AgWeatherNet – USGS National Map Viewer
WSU ArcGIS Site Evaluation Tool
Soil Factors
• Depth (restriction) • Water holding capacity
–Irrigation needs and water rights • pH
–Irrigation water and quality • Texture • Variability or uniformity
Web Resources - Soils
Web Resources - Soils
Web Resources - Soils
Weather Factors
• Precipitation • Wind • Temperature
–Growing Degree Days –Frost Free Days –Frost/Freeze Events
Web Resources - Weather
Topographic Factors
• Slope • Sunlight Interception
–Aspect –Hillshade
• Elevation
Web Resources - Topography
Soil Factors
Depth
Restriction
Water
Holding
Capacity
Irrigation
Water
Rights
pH Irrigation
Water
Quality
Texture
Bedrock Low - irrigate
Must have Low - lime Bicarbonates – sulfur/acid
Irrigation
Rip Caliche High – cover crops
Lease options
High – sulfur?
Sodium Drainage
Rip Hard Pan
Junior or Senior
Uniform vs Variable
Weather Factors
Precipitation Wind Heat Accum
(GDD)
Frost Free
Days
Frost/Freeze
Events
Irrigation Little – disease issues
Low – Cultivar selection
Cultivar Selection
Wind Machines
Drainage Moderate – Wind Break
Low – Row Covers
Own rooted vines
Disease Pressure - Timing!
Severe – irrigation/ wind break
High – Cultivar Selection
Trellising systems
Topographic Factors
Slope Aspect Hillshade Elevation
Difficult to modify
Row orientation Difficult to modify
Can be moderating for high summer temps
Some equipment options
What is your latitude?
Too high is too cold
Explore Your Site
• No fix needed • Easy to deal with • Can be dealt with – cost benefit • Look somewhere else
