Water sensitive crops such as vegetables and some tropical fruits should be irrigated
Sand: 35 mm/mSandy loam: 45 mm/mLoam: 50 mm/mClay loam: 30 mm/mLight clay: 25 mm/mMedium to heavy clay: 25 mm/m
Most fruit crops and table grapes, most tropical fruits
Sand: 35 mm/mSandy loam: 60 mm/mLoam: 70 mm/mClay loam: 55 mm/mLight clay: 45 mm/mMedium to heavy clay: 45 mm/m
Lucerne, most pasture, crops such as maize and soybeans, and grapes
Sand: 35 mm/mSandy loam: 65 mm/mLoam: 85 mm/mClay loam: 65 mm/mLight clay: 55 mm/mMedium to heavy clay: 55 mm/m
Annual pastures and hardy crops such as cotton, sorghum and winter cereals
Sand: 40 mm/mSandy loam: 70 mm/mLoam: 90 mm/mClay loam: 80 mm/mLight clay: 70 mm/mMedium to heavy clay: 65 mm/m
Available Water (AW) is the total water available in the soil. Plants stress well before this level is reached.
Sand: 60 mm/mSandy loam: 115 mm/mLoam: 150 mm/mClay loam: 150 mm/mLight clay: 150 mm/mMedium to heavy clay: 140 mm/m