Appearance
of clay, clay loam, and silty clay loam soils at various soil moisture
conditions.
Available
Water Capacity 1.6-2.4 inches/foot:
Percent Available: Currently
available soil moisture as a percent of available water capacity.
In/ft. Depleted: Inches of
water needed to refill a foot of soil to field capacity.
0-25 percent available 2.4-1.2 in/ft. depleted: Dry, soil aggregations separate easily, clods
are hard to crumble with applied pressure. (Not pictured)
25-50 percent available 1.8-0.8 in/ft.
depleted (Figure 1): Slightly moist, forms a weak ball, very few
soil aggregations break away, no water stains, clods flatten with
applied pressure.

Figure 1
50 - 75 percent available 1.2-0.4
in./ft. depleted (Figure2): Moist, forms a smooth ball with defined finger
marks, light soil/water staining on fingers, ribbons between thumb and
forefinger.

Figure 2
75-100 percent available 0.6-0.0 in./ft.
depleted(Figure 3): Wet, forms a ball, uneven medium to heavy
soil/water coating on fingers, ribbons easily between thumb and
forefinger.

Figure 3
100 percent available 0.0
in./ft. depleted (field capacity): Wet, forms a soft ball, free water appears on
soil surface after squeezing or shaking, thick soil/water coating on
fingers, slick and sticky. (Not pictured)
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