Agronomic Spatial Variability and Resolution. What is it? How do we describe it? What does it imply for precision management?. Agronomic Variability. Fundamental assumption of precision farming Agronomic factors vary spatially within a field
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What is it?
How do we describe it?
What does it imply for precision management?
Classification
Texture
Organic matter
Water holding capacity
Topography
Slope
Aspect
Fertility
pH
Nitrogen
Phosphorus
Potassium
Other nutrients
Plant available water
Crop Cultivar
Agronomic VariablesRainfall
Weeds
Species
Population
Insects
Species
Feeding patterns
Tillage Practices
Soil Compaction
Diseases
Macro and micro environment
Crop Stand
Method and Uniformity of Application
Fertilizers
Crop protectants
Agronomic Variablesn
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X
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96
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Z
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96
s
Standard DeviationWhere: X is the mean(average) value Z is a value (measurement) s is the standard deviation
Population = Y
Mean Plant Spacing
Std. Dev. = s
CV
Population = ½ Y
Mean Plant Spacing
Std. Dev.
CV
To calculate r2, simply square the value of r.