Biotransformations of Selenium Oxyanion by Filamentous Cyanophyte-Dominated Mat Cultured from Agricultural Drainage Waters

1998 ◽  
Vol 32 (20) ◽  
pp. 3185-3193 ◽  
Author(s):  
Teresa W.-M. Fan ◽  
Richard M. Higashi ◽  
Andrew N. Lane
Keyword(s):  
Agricultural Drainage ◽  
Drainage Waters

Electrical Conductivity of Agricultural Drainage Water in Iowa

2017 ◽  
Vol 33 (3) ◽  
pp. 369-378 ◽  
Author(s):  
Brett A Zimmerman ◽  
Amy L Kaleita
Keyword(s):  
Electrical Conductivity ◽  
Environmental Conditions ◽  
Major Ions ◽  
Ionic Composition ◽  
Field Investigation ◽  
Drainage Water ◽  
Specific Electrical Conductivity ◽  
Agricultural Drainage ◽  
Bulk Electrical Conductivity ◽  
Drainage Waters

Abstract. Assessing the effectiveness of management strategies to reduce agricultural nutrient efflux is hampered by the lack of affordable, continuous monitoring systems. Generalized water quality monitoring is possible using electrical conductivity. However environmental conditions can influence the ionic ratios, resulting in misinterpretations of established electrical conductivity and ionic composition relationships. Here we characterize specific electrical conductivity (k25) of agricultural drainage waters to define these environmental conditions and dissolved constituents that contribute to k25. A field investigation revealed that the magnitude of measured k25 varied from 370 to 760 µS cm-1. Statistical analysis indicated that variability in k25 was not correlated with drainage water pH, temperature, nor flow rate. While k25 was not significantly different among drainage waters from growing and post-growing season, significant results were observed for different cropping systems. Soybean plots in rotation with corn had significantly lower conductivities than those of corn plots in rotation with soybeans, continuous corn plots, and prairie plots. In addition to evaluating k25 variability, regression analysis was used to estimate the concentration of major ions in solution from measured k25. Regression results indicated that HCO3-, Ca2+, NO3-, Mg2+, Cl-, Na2+, SO42- were the major drainage constituents contributing to the bulk electrical conductivity. Calculated ionic molal conductivities of these analytes suggests that HCO3-, Ca2+, NO3-, and Mg2+ account for approximately 97% of the bulk electrical conductivity. Keywords: Electrical conductivity, Salinity, Subsurface drainage, Total dissolved solids.

scholarly journals Multi-Year N and P Removal of a 10-Year-Old Surface Flow Constructed Wetland Treating Agricultural Drainage Waters

Agronomy ◽  
2019 ◽  
Vol 9 (4) ◽  
pp. 170 ◽  
Author(s):  
Massimo Tolomio ◽  
Nicola Dal Ferro ◽  
Maurizio Borin
Keyword(s):  
Removal Efficiency ◽  
Drainage Basin ◽  
Venice Lagoon ◽  
Surface Flow ◽  
Agricultural Drainage ◽  
Total N ◽  
N Removal ◽  
Nitrogen Concentrations ◽  
Drainage Waters ◽  
P Removal

Surface flow constructed wetlands (SFCWs) can be effectively used to treat agricultural drainage waters, reducing N and P surface water pollution. In the Venice Lagoon drainage basin (northeastern Italy), an SFCW was monitored during 2007–2013 to assess its performance in reducing water, N, and P loads more than 10 years after its creation. Nitrogen concentrations showed peaks during winter due to intense leaching from surrounding fields. Phosphorus concentrations were higher after prolonged periods with no discharge, likely due to mobilization of P of the decomposing litter inside the basin. Over the entire period, N removal efficiency was 83% for NO3–N and 79% for total N; P removal efficiency was 48% for PO4–P and 67% for total P. Values were higher than in several other studies, likely due to the fluctuating hydroperiod that produced discontinuous and reduced outflows. Nitrogen outlet concentrations were reduced by the SFCW, and N removal ratios decreased with increasing hydraulic loading, while no strong correlations were found in the case of P. The SFCW was shown to be an effective long-term strategy to increase water storage and reduce N and P loads in the Venice Lagoon drainage basin.

Determination of commonly used polar herbicides in agricultural drainage waters in Australia by HPLC

Chemosphere ◽  
2007 ◽  
Vol 67 (5) ◽  
pp. 944-953 ◽  
Author(s):  
Anh T.K. Tran ◽  
Ross V. Hyne ◽  
Philip Doble
Keyword(s):  
Agricultural Drainage ◽  
Drainage Waters

Nitrous Oxide in Agricultural Drainage Waters Following Field Fertilisation

2004 ◽  
Vol 4 (2/3) ◽  
pp. 437-451 ◽  
Author(s):  
David S. Reay ◽  
Keith A. Smith ◽  
Anthony C. Edwards
Keyword(s):  
Nitrous Oxide ◽  
Agricultural Drainage ◽  
Drainage Waters

Nitrous oxide emission from agricultural drainage waters

2003 ◽  
Vol 9 (2) ◽  
pp. 195-203 ◽  
Author(s):  
David S. Reay ◽  
Keith A. Smith ◽  
Anthony C. Edwards
Keyword(s):  
Nitrous Oxide ◽  
Nitrous Oxide Emission ◽  
Agricultural Drainage ◽  
Drainage Waters
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