Effect of Water-Table Levels on Evapotranspiration and Crop Yield

1970 ◽  
Vol 13 (2) ◽  
pp. 0168-0170 ◽  
Author(s):  
R. E. Williamson and John R. Carreker
Keyword(s):  
Crop Yield ◽  
Water Table ◽  
Effect Of Water

Effect of Water Table Management on Water Quality and Crop Yield at the Plot and Farm Scale Fields

2004 ◽  
Author(s):  
C.S. Tan ◽  
C.F. Drury ◽  
J.D. Gaynor ◽  
W.D. Reynolds ◽  
T.W. Welacky ◽  
...  
Keyword(s):  
Water Quality ◽  
Crop Yield ◽  
Water Table ◽  
Effect Of Water ◽  
Farm Scale ◽  
Water Table Management

Effect of Water Table Depth on Growth and Yield of Soybean Yudou 16

2013 ◽  
Vol 18 (9) ◽  
pp. 1070-1076 ◽  
Author(s):  
Yonghua Zhu ◽  
Liliang Ren ◽  
Haishen Lü ◽  
Sam Drake ◽  
Zhongbo Yu ◽  
...  
Keyword(s):  
Water Table ◽  
Water Table Depth ◽  
Growth And Yield ◽  
Effect Of Water

Effect of Water Table Depth on the Yield of Seven Sugarcane Varieties in Puerto Rico

1969 ◽  
Vol 60 (2) ◽  
pp. 228-237
Author(s):  
Raúl Pérez Escolar ◽  
William F. Allison
Keyword(s):  
Puerto Rico ◽  
Water Table ◽  
Commercial Production ◽  
Water Table Depth ◽  
Field Conditions ◽  
Sugarcane Varieties ◽  
Effect Of Water ◽  
Actual Field ◽  
Response To Water

The effect of water table depth on yield of sugarcane varieties PR 980, PR 1028, PR 1059, PR 1141, PR 64-610, PR 61-632 and PR 64-2705 was studied in lysimeter tanks in the field. Using plastic drains at varying distances and depths, variety PR 980 was studied on a 5-ha farm. Results obtained show that varieties differ in their response to water table conditions. Varieties PR 980, PR 1059, PR 64-610, PR 61-632 and PR 64-2705 yielded significantly more cane and sugar when the water table was lowered. Varieties PR 1028 and PR 1141 did not show statistically significant differences among treatment differentials. Under actual field conditions, using perforated plastic drains, variety PR 980 yielded significantly more sugar than in undrained plots. The results obtained in the lysimeter tanks are in accord with those observed under commercial production.

Reactive transport of dichloromethane in porous media under dynamic hydrogeological conditions: from experiments to modelling

2020 ◽  
Author(s):  
Maria Prieto Espinoza ◽  
Sylvain Weill ◽  
Raphaël Di chiara ◽  
Benjamin Belfort ◽  
François Lehmann ◽  
...  
Keyword(s):  
Porous Media ◽  
Water Table ◽  
Reactive Transport ◽  
Transport Processes ◽  
Redox Conditions ◽  
Degradation Pathways ◽  
Water Table Fluctuations ◽  
Transport In Porous Media ◽  
Effect Of Water ◽  
Hydrogeological Conditions

<p>Reactive transport in porous media involves a complex interplay of multiple processes relative to flow of water and gases, transport of elements, chemical reactions and microbial activities. In surface-groundwater interfaces, the role of the capillary fringe is of particular interest as water table variations can strongly impact the transfer of gases (e.g. oxygen), the evolution of redox conditions and the evolution/adaptation of bacterial/microbial populations that control biodegradation pathways of contaminants. Although the understanding of individual processes is advanced, their interactions are not yet fully understood challenging the development of efficient reactive transport models (RTM) for predictive applications. In this context, the combination of microbial approaches with isotope measurements and modelling may be useful to understand reactive transport of halogenated pollutants in hydrogeological dynamic systems, to improve processes representation in RTMs, and to reduce model equifinality. Dichloromethane (DCM) is a toxic and volatile halogenated compound frequently detected in multi-contaminated aquifers. Although mechanisms of DCM microbial degradation under both aerobic and anaerobic conditions have been described, little is known about the relationships between the hydrogeochemical variations caused by water table fluctuations, as well as their effects on the diversity and distribution of bacterial communities and degradation pathways.<br>            In this study, two laboratory aquifers fed by contaminated groundwater from the industrial site Thermeroil (France) were designed to collect water samples at high-resolution to investigate the reactive transport of DCM in porous media under steady and dynamic hydrogeological conditions. The effect of water table variations on hydrochemical, microbial and isotopic composition (δ<sup>13</sup>C and δ<sup>37</sup>Cl) was examined to derive DCM mass removal and potential changes in degradation pathways. For the latter, Compound-Stable Isotope Analysis (CSIA) has been used as a tool to evaluate natural degradation of halogenated hydrocarbons. A RTM model (CubicM) is currently being developed to include dual-element CSIA and biological processes - such as growth, decay, attachment, detachment or dormancy – and relate changes in redox conditions with the evolution of DCM degrading populations. A two-phase flow model (i.e. water and gas) has been developed to account for the volatilization and the associated transport processes of halogenated volatile compounds in porous media. Currently, the model is tested on the experimental results to assist in the interpretation of DCM dissipation and the observed biogeochemical and microbial processes to determine the best-suited formalism to address the effect of water table fluctuations on DCM reactive transport in porous media. Such model will enable to assess natural attenuation of DCM at contaminated sites accounting for dynamic hydrogeological conditions.</p>

scholarly journals Effect of water table on greenhouse gas emissions from peatland mesocosms

2008 ◽  
Vol 318 (1-2) ◽  
pp. 229-242 ◽  
Author(s):  
Kerry J. Dinsmore ◽  
Ute M. Skiba ◽  
Michael F. Billett ◽  
Robert M. Rees
Keyword(s):  
Greenhouse Gas Emissions ◽  
Greenhouse Gas ◽  
Water Table ◽  
Gas Emissions ◽  
Effect Of Water

Effect of water table drawdown on peatland dissolved organic carbon export and dynamics

2008 ◽  
Vol 22 (17) ◽  
pp. 3373-3385 ◽  
Author(s):  
M. Strack ◽  
J. M. Waddington ◽  
R. A. Bourbonniere ◽  
E. L. Buckton ◽  
K. Shaw ◽  
...  
Keyword(s):  
Organic Carbon ◽  
Dissolved Organic Carbon ◽  
Water Table ◽  
Carbon Export ◽  
Effect Of Water
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