GENERAL IRRIGATION WATER REQUIREMENT GUIDE

SOIL TEXTURE

FINE

MODERATELYFINE

MEDIUM

MODERATELYCOARSE

COARSE

(INCHES)

Clay, Silty Clay, & Sandy Clay

Clay Loam, Silty Clay Loam, & Sandy Clay Loam

Silt, Silt Loam, Loam & Very Fine Sandy Loam

Fine Sandy Loam & Sandy Loam

Loamy Sand &Sand

depths

(INCHES)

P "Approximate soil water deficit" at irrigation for given root zone depths. UNITS: INCHES

0-6

0.5

0.63

0.56

0.38

0.25

40%

6-12

0.38

0.47

0.42

0.28

0.19

30%

12-18

0.25

0.31

0.28

0.19

0.13

20%

18-24

0.13

0.16

0.14

0.1

0.06

10%

Approximate irrigation requirement for a TWO FOOT root zone P P :

2.0"

2.5"

2.2"

1.5"

1.0"

Note: About 70% of plant uptake occurs at the 0-12" depth.

NOTE: as a general rule of thumb, a two-inch irrigation is considered a high irrigation efficiency (i.e., assuming irrigation is uniformly applied across the entire field).