1]) Season 1 (2010/11) 100S1 9190 34 331 81S1 8340 31 330 56S1 7650 29 313 29S1 5312 25 247 Season 2 (2011/12) 100S2 8888 42 480 84S2 8455 38 470 59S2 6989 28 391 30S2 6174 29 301 * 100S1, 81S1, 56S1 and 29S1: different irrigation strategies applied to maize grown in season 1 (2010/11); 100S2, 84S2, 59S2 and 30S2: different irrigation strategies applied to maize grown in season 2 (2011/12); T = Treatments; P = Precipitation (mm); I = net irrigation depth (mm); DP = Deep Percolation
(mm); RO = runoff (mm); [DELTA]ASW: variation of available soil water during the crop cycle (mm); [ET.
The deep percolation
factor is derived from the saturated hydraulic conductivity (K[sub.
Then, the values of evapotranspiration and deep percolation
at the specified time period were calculated as follows:
In this case for treatment T6, rainfall was not used effectively and was lost as deep percolation
Also, the operational hours should be fixed in such a manner that both excessive flooding and deep percolation
Runoff and deep percolation
frequently occur with surface irrigation and may affect water quality and the environment.
The more difficult problem is the large percentage of the water balance constituted by deep percolation
and the poor quality of this water due to high N[O.
The use of a water dynamics model allows the long term evaluation not only of evaporation, and transpiration flows but also deep percolation
, which is difficult to estimate in the field (Feddes et al.
It was found that before mixing of bentonite, water traveled only 19 m along the field because all the water deep percolated before reaching the tail and water deep percolation
depth was 0.
In addition, there are no still deep percolation
losses, but TWR greatly increases and [E.
Information about recharge or deep percolation
from specific tillage practices are scarce, and few studies exist in the Great Plains that examine the impact of winter wheat tillage practices on groundwater levels.
To this end, we developed a root zone soil water balance model to determine the deep percolation
from applied water (irrigation) and rainfall between soil sampling dates for comparison with changes in soil profile salinity parameters that occurred at the control and test sites.