Soil Classification Triangle - Rain Bird ESP-SMT Installation & Operation Manual

Soil Classification Triangle

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This tool is used to classify the soil based on soil texture.
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Soil texture describes the size and shape of individual
soil particles such as sand, silt, or clay. The soil texture
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class describes the relative amounts of sand, silt, and
PERCENT 70 PERCENT
clay in that particular soil.
CLAY SILT
CLAY
60
Soil texture has a major influence on the amount of
water stored (moisture holding capacity) in a soil. This is
50
used to determine how much to irrigate and the timing
SILTY
40
of required irrigation.
CLAY
CLAY
30
The ability of water to enter the soil profile (infiltration
LOAM
rate) and the rate at which water can move through the
20
17%
soil (permeability) is determined by the soil texture. The
SANDY LOAM
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infiltration rate and permeability of the soil, combined
LOAMY
LOAM
SAND
SAND
with the slope of the irrigated area will determine how
0
long each irrigation event (cycle) should run and how
much time should elapse (soak) between cycles to
PERCENT SAND
prevent water from running off the soil.
To determine the Soil Type (Classification) using the Soil
The three soil particle type lines for the soil sample
Classification Triangle, draw a parallel line for the value example intersect in the LOAM soil classification area.
of each soil particle type. The Soil Type is identified by
where the three lines intersect in the Soil Classification
Triangle.
ESP-SMT Smart Modular Control System
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