Water Balance and Corn Yield under Different Water Table Management Scenarios in Southern Quebec

2010 ◽  
Author(s):  
Ajay K Singh ◽  
Chandra A Madramootoo ◽  
Donald L Smith
Keyword(s):  
Water Balance ◽  
Water Table ◽  
Corn Yield ◽  
Management Scenarios ◽  
Water Table Management

Water Table Management for Upland Crops: A Theoretical Modelling Investigation

2012 ◽  
Author(s):  
Ayob Katimon
Keyword(s):  
Water Balance ◽  
Water Table ◽  
Root Zone ◽  
Theoretical Modelling ◽  
Balance Model ◽  
Practical Application ◽  
Local Data ◽  
Rice Farmers ◽  
Water Tables ◽  
Water Table Management

Kertas ini membincangkan beberapa aspek pengurusan paras air tanah untuk kegunaan tanaman ladang di kawasan sawah padi terbiar yang mempunyai paras tanah cetek. Oleh sebab tanaman ladang menjadi lebih penting kepada para petani sebagai sebahagian program mempelbagaikan tanaman, maka sokongan teknikal mengenai bagaimana sumber air ladang dapat dioptimumkan untuk tanaman amat diperlukan. Satu kajian teoriteknikal berdasarkan model imbangan air tanah pada ruang akar tanaman dan kesannya terhadap penyusutan paras air tanah telah dilakukan. Keputusan pemodelan digunakan untuk merancang kawalan paras air tanah yang sesuai kepada tanaman ladang. Aplikasi yang praktikal telah ditunjukkan dengan menggunakan beberapa data tempatan. Kata kunci: Paras air tanah, pengairan, tanaman ladang, imbangan air This study discusses some aspects of water table management for upland crops in the abandoned rice fields of shallow field water tables. As upland crops are gaining importance to rice farmers as part of the crop diversification programme, a technical support on how to manage the water resources optimally for plant growth would be extremely valuable. A theoretical investigation based on soil–water balance model in the root zone and water table draw–down is presented. The result is used to formulate the necessary water table control suitable for upland crops. A practical application is demonstrated by the translation of the concluding formula into a local data. Key words: Water table, irrigation, field crop, water balance

LINKFLOW, A WATER FLOW COMPUTER MODEL FOR WATER TABLE MANAGEMENT: PART 3. MODEL APPLICATION

1997 ◽  
Vol 40 (6) ◽  
pp. 1543-1547 ◽  
Author(s):  
P. L. Havard ◽  
S. O. Prasher ◽  
R. B. Bonnell ◽  
A. Madani
Keyword(s):  
Water Flow ◽  
Water Table ◽  
Computer Model ◽  
Model Application ◽  
Water Table Management

scholarly journals Water Table Management Reduces Tile Nitrate Loss in Continuous Corn and in a Soybean-Corn Rotation

2001 ◽  
Vol 1 ◽  
pp. 163-169 ◽  
Author(s):  
Craig F. Drury ◽  
Chin S. Tan ◽  
John D. Gaynor ◽  
John W. Daniel Reynolds ◽  
Thomas W. Welacky ◽  
...  
Keyword(s):  
Drinking Water ◽  
Water Table ◽  
Nitrate Concentration ◽  
Tile Drainage ◽  
N Fertilizer ◽  
Phase 2 ◽  
Nitrate Loss ◽  
Continuous Corn ◽  
Water Table Management ◽  
Drinking Water Guideline

Water table management systems can be designed to alleviate soil water excesses and deficits, as well as reduce nitrate leaching losses in tile discharge. With this in mind, a standard tile drainage (DR) system was compared over 8 years (1991 to 1999) to a controlled tile drainage/subirrigation (CDS) system on a low-slope (0.05 to 0.1%) Brookston clay loam soil (Typic Argiaquoll) in southwestern Ontario, Canada. In the CDS system, tile discharge was controlled to prevent excessive drainage, and water was pumped back up the tile lines (subirrigation) to replenish the crop root zone during water deficit periods. In the first phase of the study (1991 to 1994), continuous corn (Zea mays, L.) was grown with annual nitrogen (N) fertilizer inputs as per local soil test recommendations. In the second phase (1995 to 1999), a soybean (Glycine max L., Merr.)-corn rotation was used with N fertilizer added only during the two corn years. In Phase 1 when continuous corn was grown, CDS reduced total tile discharge by 26% and total nitrate loss in tile discharge by 55%, compared to DR. In addition, the 4-year flow weighted mean (FWM) nitrate concentration in tile discharge exceeded the Canadian drinking water guideline (10 mg N l–1) under DR (11.4 mg N l–1), but not under CDS (7.0 mg N l–1). In Phase 2 during the soybean-corn rotation, CDS reduced total tile discharge by 38% and total nitrate loss in tile discharge by 66%, relative to DR. The 4-year FWM nitrate concentration during Phase 2 in tile discharge was below the drinking water guideline for both DR (7.3 mg N l–1) and CDS (4.0 mg N l–1). During both phases of the experiment, the CDS treatment caused only minor increases in nitrate loss in surface runoff relative to DR. Hence CDS decreased FWM nitrate concentrations, total drainage water loss, and total nitrate loss in tile discharge relative to DR. In addition, soybean-corn rotation reduced FWM nitrate concentrations and total nitrate loss in tile discharge relative to continuous corn. CDS and crop rotations with reduced N fertilizer inputs can thus improve the quality of tile discharge water substantially.

Effects of climate change and human interactions on water balance dynamics in the River Vistula basin

2021 ◽  
Author(s):  
Renata Romanowicz ◽  
Emilia Karamuz ◽  
Jaroslaw Napiorkowski ◽  
Tesfaye Senbeta
Keyword(s):  
Water Balance ◽  
Groundwater Level ◽  
Structural Model ◽  
Human Impacts ◽  
Management Scenarios ◽  
Annual Water Balance ◽  
Catchment Size ◽  
Dryness Index ◽  
Water Balance Models ◽  
Annual Water

<div> <p>Water balance modelling is often applied in studies of climate and human impacts on water resources. Annual water balance is usually derived based on precipitation, discharge and temperature observations under an assumption of negligible changes in annual water storage in a catchment. However, that assumption might be violated during very dry or very wet years. In this study we apply groundwater level measurements to improve water balance modelling in nine sub-catchments of the River Vistula basin starting from the river sources downstream. Annual and inter-annual water balance is studied using a Budyko framework to assess actual evapotranspiration and total water supply. We apply the concept of effective precipitation to account for possible losses due to water interception by vegetation. Generalised Likelihood Uncertainty Estimation GLUE is used to account for parameter and structural model uncertainty, together with the application of eight Budyko-type equations. Seasonal water balance models show large errors for winter seasons while summer and annual water balance models follow the Budyko framework. The dryness index is much smaller in winter than in summer for all sub-catchments. The spatial variability of water balance modelling errors indicate an increasing uncertainty of model predictions with an increase in catchment size. The results show that the added information on storage changes in the catchments provided by groundwater level observations largely improves model accuracy. The results also indicate the need to model groundwater level variability depending on external factors such as precipitation and evapotranspiration and human interventions. The modelling tools developed will be used to assess future water balance in the River Vistula basin under different water management scenarios and climate variability.</p> </div>

Evaluation of the Hydrologic Component of the ADAPT Water Table Management Model

1992 ◽  
Vol 35 (2) ◽  
pp. 571-579 ◽  
Author(s):  
S. O. Chung ◽  
A. D. Ward ◽  
C. W. Schalk
Keyword(s):  
Water Table ◽  
Management Model ◽  
Water Table Management
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