Misr J. Ag. Eng., 26(3) - Misr Journal Of Agricultural Engineering ...

250
0.96
ET0, ETc and FWS in (mm)
200
150
100
50
0.95
0.94
0.93
0.92
0.91
0.90
crop coefficient (Kc)
0
0.89
1-Dec-2005
1-Nov-2005
1-Oct-2005
1-Sep-2005
1-Aug-2005
1-Juḻ2005
1-Jun-2005
1-May-2005
1-Apr-2005
1-Mar-2005
1-Feb-2005
1-Jan-2005
Eto (mm/month)
Etc (mm/month)
Date in (Month)
FWS for sprinkler irrigaton systems (mm/month) ( appl. Effic. 80% )
FWS for sub-surface irrigaton systems (mm/month) (appl. Effic 90 % )
Crop coefficient (Kc)
Figure (3): Average monthly evapotranspiration (ET 0 ), plant
evapotranspiration (ETc) and flied water supply (FWS) recorded
along the growing season of Bermuda grass
2. Volumetric soil moisture content distribution
The volumetric soil moisture content decreased with soil depth after 2
hours from irrigation for the sprinkler systems (rotary and spray heads)
and the two types of irrigation water (Nile and treated sewage) as
presented in table (2). However, after 48 and 72 hours, it increased at a
depth of 30 cm and then decreased at a depth of 50 cm with the treated
sewage water and the two tested sprinkler heads. For the two types of
water applied, the volumetric soil moisture content decreased with time
Misr J. Ag. Eng., July 2009 1232