Educational interactive vector simulation of water table control designs using LabView

2020 ◽  
Vol 28 (4) ◽  
pp. 853-866
Author(s):  
Faridoun A. M. Allawi
Keyword(s):  
Water Table ◽  
Control Designs ◽  
Water Table Control

Dissolved Phosphorus Losses in Tile Drainage under Subirrigation

2006 ◽  
Vol 41 (1) ◽  
pp. 63-71 ◽  
Author(s):  
Nicolas Stämpfli ◽  
Chandra A. Madramootoo
Keyword(s):  
Water Table ◽  
Residual Effect ◽  
Surface Water Quality ◽  
Soil Surface ◽  
Quality Standard ◽  
Tile Drainage ◽  
Agricultural Field ◽  
Shallow Water Table ◽  
Dissolved Phosphorus ◽  
Water Table Control

Abstract Recent studies have shown subirrigation (SI) to be effective in reducing nitrate losses from agricultural tile drainage systems. A field study was conducted from 2001 to 2002 in southwestern Québec to evaluate the effect of SI on total dissolved phosphorus (TDP) losses in tile drainage. In an agricultural field with drains installed at a 1-m depth, a SI system with a design water table depth (WTD) of 0.6 m below the soil surface was compared with conventional free drainage (FD). Subirrigation increased drainage outflow volumes in the autumn, when drains were opened and water table control was interrupted for the winter in the SI plots. Outflows were otherwise similar for both treatments. Throughout the study, the TDP concentrations in tile drainage were significantly higher with SI than with FD for seven out of 17 of the sampling dates for which data could be analyzed statistically, and they were never found to be lower for plots under SI than for plots under FD. Of the seven dates for which the increase was significant, six fell in the period during which water table control was not implemented (27 September 2001 to 24 June 2002). Hence, it appears that SI tended to increase TDP concentrations compared with FD, and that it also had a residual effect between growing seasons. Almost one-third of all samples from the plots under SI exceeded Québec's surface water quality standard (0.03 mg TDP L-1), whereas concentrations in plots under FD were all below the standard. Possible causes of the increase in TDP concentrations in tile drainage with SI are high TDP concentrations found in the well water used for SI and a higher P solubility caused by the shallow water table.

Water Table Control

2015 ◽  
pp. 693-693
Keyword(s):  
Water Table ◽  
Water Table Control

Water table control of CH4emission enhancement by vascular plants in boreal peatlands

1996 ◽  
Vol 101 (D17) ◽  
pp. 22775-22785 ◽  
Author(s):  
J. M. Waddington ◽  
N. T. Roulet ◽  
R. V. Swanson
Keyword(s):  
Water Table ◽  
Vascular Plants ◽  
Boreal Peatlands ◽  
Water Table Control

Effect of tillage and water table control on evapotranspiration, surface runoff, tile drainage and soil water content under maize on a clay loam soil

2002 ◽  
Vol 54 (3) ◽  
pp. 173-188 ◽  
Author(s):  
C.S Tan ◽  
C.F Drury ◽  
J.D Gaynor ◽  
T.W Welacky ◽  
W.D Reynolds
Keyword(s):  
Water Content ◽  
Soil Water ◽  
Soil Water Content ◽  
Water Table ◽  
Surface Runoff ◽  
Tile Drainage ◽  
Clay Loam ◽  
Clay Loam Soil ◽  
Loam Soil ◽  
Water Table Control

scholarly journals Effects of Water Table Control by Farm-Oriented Enhancing Aquatic System on Photosynthesis, Nodule Nitrogen Fixation, and Yield of Soybeans

2012 ◽  
Vol 15 (2) ◽  
pp. 132-143 ◽  
Author(s):  
Shinji Shimada ◽  
Hideo Hamaguchi ◽  
Yeonghoo Kim ◽  
Kazuya Matsuura ◽  
Masayasu Kato ◽  
...  
Keyword(s):  
Nitrogen Fixation ◽  
Water Table ◽  
Aquatic System ◽  
Water Table Control

scholarly journals Ammonia Volatilization Losses from Paddy Fields under Controlled Irrigation with Different Drainage Treatments

2014 ◽  
Vol 2014 ◽  
pp. 1-7 ◽  
Author(s):  
Yupu He ◽  
Shihong Yang ◽  
Junzeng Xu ◽  
Yijiang Wang ◽  
Shizhang Peng
Keyword(s):  
Water Table ◽  
Irrigation Water ◽  
Ammonia Volatilization ◽  
Water Table Depth ◽  
Paddy Fields ◽  
Significant Difference ◽  
Controlled Irrigation ◽  
Management Method ◽  
Water Volumes ◽  
Water Table Control

The effect of controlled drainage (CD) on ammonia volatilization (AV) losses from paddy fields under controlled irrigation (CI) was investigated by managing water table control levels using a lysimeter. Three drainage treatments were implemented, namely, controlled water table depth 1 (CWT1), controlled water table depth 2 (CWT2), and controlled water table depth 3 (CWT3). As the water table control levels increased, irrigation water volumes in the CI paddy fields decreased. AV losses from paddy fields reduced due to the increases in water table control levels. Seasonal AV losses from CWT1, CWT2, and CWT3 were 59.8, 56.7, and 53.0 kg N ha−1, respectively. AV losses from CWT3 were 13.1% and 8.4% lower than those from CWT1 and CWT2, respectively. A significant difference in the seasonal AV losses was confirmed between CWT1 and CWT3. Less weekly AV losses followed by TF and PF were also observed as the water table control levels increased. The application of CD by increasing water table control levels to a suitable level could effectively reduce irrigation water volumes and AV losses from CI paddy fields. The combination of CI and CD may be a feasible water management method of reducing AV losses from paddy fields.

SUBSURFACE DRIP IRRIGATION FOR WATER TABLE CONTROL AND POTATO PRODUCTION

2000 ◽  
Vol 16 (3) ◽  
pp. 225-229 ◽  
Author(s):  
A. G. Smajstrla ◽  
S. J. Locascio ◽  
D. P. Weingartner ◽  
D. R. Hensel
Keyword(s):  
Water Table ◽  
Drip Irrigation ◽  
Potato Production ◽  
Subsurface Drip Irrigation ◽  
Subsurface Drip ◽  
Water Table Control
Sign in / Sign up

Export Citation Format

Share Document