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subsurface drainage systems enters aquatic systems and contributes to 
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subsurface drainage systems enters aquatic systems and contributes to 
            
92
eutrophication, habitat degradation and loss of biodiversity. 
102
eutrophication, habitat degradation and loss of biodiversity. 
            
93
Denitrification bioreactors, in combination with controlled drainage, 
103
Denitrification bioreactors, in combination with controlled drainage, 
            
94
are proposed as a means of reducing nitrogen emitted through 
104
are proposed as a means of reducing nitrogen emitted through 
            
95
subsurface agricultural drainage systems, but their suitability in 
105
subsurface agricultural drainage systems, but their suitability in 
            
96
colder climates where soils and drainage systems freeze during winter 
106
colder climates where soils and drainage systems freeze during winter 
            
97
is poorly understood. This study presents the first field scale 
107
is poorly understood. This study presents the first field scale 
            
98
evaluation of denitrification bioreactors under cold climate 
108
evaluation of denitrification bioreactors under cold climate 
            
99
conditions during a three-year period in Quebec, Canada. Under a 
109
conditions during a three-year period in Quebec, Canada. Under a 
            
100
three-year crop rotation, about 55% of the total annual subsurface 
110
three-year crop rotation, about 55% of the total annual subsurface 
            
101
drainage water passed through bioreactors, which significantly lowered 
111
drainage water passed through bioreactors, which significantly lowered 
            
102
the total-nitrogen (72%) and nitrate-nitrogen (99%) median 
112
the total-nitrogen (72%) and nitrate-nitrogen (99%) median 
            
103
concentrations in thesubsurface drainage outflows. Loadings of 
113
concentrations in thesubsurface drainage outflows. Loadings of 
            
104
nitrate-nitrogen from the test fields to surface drainage ditches were 
114
nitrate-nitrogen from the test fields to surface drainage ditches were 
            
105
reduced by 99%, equivalent to about 11 kg nitrate-nitrogen ha 1 year 1 
115
reduced by 99%, equivalent to about 11 kg nitrate-nitrogen ha 1 year 1 
            
106
removal in the test area and approximately 7 g nitrate-nitrogen 
116
removal in the test area and approximately 7 g nitrate-nitrogen 
            
107
removal m 3 bioreactor volume d 1. Aquatic environmental criteria 
117
removal m 3 bioreactor volume d 1. Aquatic environmental criteria 
            
108
non-compliance events declined by 96% for nitrate-nitrogen and by 50% 
118
non-compliance events declined by 96% for nitrate-nitrogen and by 50% 
            
109
for total-nitrogen during the three-year study. This study 
119
for total-nitrogen during the three-year study. This study 
            
110
demonstrates that denitrification bioreactors, combined with 
120
demonstrates that denitrification bioreactors, combined with 
            
111
controlled drainage, are an effective in-field technology for nitrogen 
121
controlled drainage, are an effective in-field technology for nitrogen 
            
112
removal from agri cultural subsurface drainage water that will improve 
122
removal from agri cultural subsurface drainage water that will improve 
            
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water quality under cold climate conditions.",
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water quality under cold climate conditions.",
            
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    "es": "Reactive nitrogen leaving agricultural fields through 
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    "es": "Reactive nitrogen leaving agricultural fields through 
            
116
subsurface drainage systems enters aquatic systems and contributes to 
126
subsurface drainage systems enters aquatic systems and contributes to 
            
117
eutrophication, habitat degradation and loss of biodiversity. 
127
eutrophication, habitat degradation and loss of biodiversity. 
            
118
Denitrification bioreactors, in combination with controlled drainage, 
128
Denitrification bioreactors, in combination with controlled drainage, 
            
119
are proposed as a means of reducing nitrogen emitted through 
129
are proposed as a means of reducing nitrogen emitted through 
            
120
subsurface agricultural drainage systems, but their suitability in 
130
subsurface agricultural drainage systems, but their suitability in 
            
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colder climates where soils and drainage systems freeze during winter 
131
colder climates where soils and drainage systems freeze during winter 
            
122
is poorly understood. This study presents the first field scale 
132
is poorly understood. This study presents the first field scale 
            
123
evaluation of denitrification bioreactors under cold climate 
133
evaluation of denitrification bioreactors under cold climate 
            
124
conditions during a three-year period in Quebec, Canada. Under a 
134
conditions during a three-year period in Quebec, Canada. Under a 
            
125
three-year crop rotation, about 55% of the total annual subsurface 
135
three-year crop rotation, about 55% of the total annual subsurface 
            
126
drainage water passed through bioreactors, which significantly lowered 
136
drainage water passed through bioreactors, which significantly lowered 
            
127
the total-nitrogen (72%) and nitrate-nitrogen (99%) median 
137
the total-nitrogen (72%) and nitrate-nitrogen (99%) median 
            
128
concentrations in thesubsurface drainage outflows. Loadings of 
138
concentrations in thesubsurface drainage outflows. Loadings of 
            
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nitrate-nitrogen from the test fields to surface drainage ditches were 
139
nitrate-nitrogen from the test fields to surface drainage ditches were 
            
130
reduced by 99%, equivalent to about 11 kg nitrate-nitrogen ha 1 year 1 
140
reduced by 99%, equivalent to about 11 kg nitrate-nitrogen ha 1 year 1 
            
131
removal in the test area and approximately 7 g nitrate-nitrogen 
141
removal in the test area and approximately 7 g nitrate-nitrogen 
            
132
removal m 3 bioreactor volume d 1. Aquatic environmental criteria 
142
removal m 3 bioreactor volume d 1. Aquatic environmental criteria 
            
133
non-compliance events declined by 96% for nitrate-nitrogen and by 50% 
143
non-compliance events declined by 96% for nitrate-nitrogen and by 50% 
            
134
for total-nitrogen during the three-year study. This study 
144
for total-nitrogen during the three-year study. This study 
            
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demonstrates that denitrification bioreactors, combined with 
145
demonstrates that denitrification bioreactors, combined with 
            
136
controlled drainage, are an effective in-field technology for nitrogen 
146
controlled drainage, are an effective in-field technology for nitrogen 
            
137
removal from agri cultural subsurface drainage water that will improve 
147
removal from agri cultural subsurface drainage water that will improve 
            
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water quality under cold climate conditions."
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