Available Water Capacity

Soil Texture Available Water Inches/Foot
Fine Sand or Loamy Sand 1.0 to 1.1
Sandy Loam 1.4
Loam or Silt Loam 2.0 to 2.5
Silty Clay Loam or Clay Loam 1.8

Scheduling Example


 

Silt loam soil AWC = 2.5 in./ft.

At silking, corn root depth = 3.0 ft.

ET estimate = 0.30 in./day

MB = 50%

Estimated soil moisture at 60% for 3.0 ft. rooting depth by hand-feel method or by moisture block readings.

AWC x root depth x soil moisture = available water

2.5″ x 3.0′ x 60% = 4.5″ available water

2.5″ x 3.0′ x 50% = 3.75″ MB / .75″ water left

.75″/0.30″ ET = 2.5 days moisture left