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  "notes": "Reactive nitrogen leaving agricultural fields through 
            
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subsurface drainage systems enters aquatic systems and contributes to 
91
subsurface drainage systems enters aquatic systems and contributes to 
            
92
eutrophication, habitat degradation and loss of biodiversity. 
92
eutrophication, habitat degradation and loss of biodiversity. 
            
93
Denitrification bioreactors, in combination with controlled drainage, 
93
Denitrification bioreactors, in combination with controlled drainage, 
            
94
are proposed as a means of reducing nitrogen emitted through 
94
are proposed as a means of reducing nitrogen emitted through 
            
95
subsurface agricultural drainage systems, but their suitability in 
95
subsurface agricultural drainage systems, but their suitability in 
            
96
colder climates where soils and drainage systems freeze during winter 
96
colder climates where soils and drainage systems freeze during winter 
            
97
is poorly understood. This study presents the first field scale 
97
is poorly understood. This study presents the first field scale 
            
98
evaluation of denitrification bioreactors under cold climate 
98
evaluation of denitrification bioreactors under cold climate 
            
99
conditions during a three-year period in Quebec, Canada. Under a 
99
conditions during a three-year period in Quebec, Canada. Under a 
            
100
three-year crop rotation, about 55% of the total annual subsurface 
100
three-year crop rotation, about 55% of the total annual subsurface 
            
101
drainage water passed through bioreactors, which significantly lowered 
101
drainage water passed through bioreactors, which significantly lowered 
            
102
the total-nitrogen (72%) and nitrate-nitrogen (99%) median 
102
the total-nitrogen (72%) and nitrate-nitrogen (99%) median 
            
103
concentrations in thesubsurface drainage outflows. Loadings of 
103
concentrations in thesubsurface drainage outflows. Loadings of 
            
104
nitrate-nitrogen from the test fields to surface drainage ditches were 
104
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 
105
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 
106
removal in the test area and approximately 7 g nitrate-nitrogen 
            
107
removal m 3 bioreactor volume d 1. Aquatic environmental criteria 
107
removal m 3 bioreactor volume d 1. Aquatic environmental criteria 
            
108
non-compliance events declined by 96% for nitrate-nitrogen and by 50% 
108
non-compliance events declined by 96% for nitrate-nitrogen and by 50% 
            
109
for total-nitrogen during the three-year study. This study 
109
for total-nitrogen during the three-year study. This study 
            
110
demonstrates that denitrification bioreactors, combined with 
110
demonstrates that denitrification bioreactors, combined with 
            
111
controlled drainage, are an effective in-field technology for nitrogen 
111
controlled drainage, are an effective in-field technology for nitrogen 
            
112
removal from agri cultural subsurface drainage water that will improve 
112
removal from agri cultural subsurface drainage water that will improve 
            
113
water quality under cold climate conditions.",
113
water quality under cold climate conditions.",
            
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  "notes_translated": {
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  "notes_translated": {
            
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    "es": "Reactive nitrogen leaving agricultural fields through 
115
    "es": "Reactive nitrogen leaving agricultural fields through 
            
116
subsurface drainage systems enters aquatic systems and contributes to 
116
subsurface drainage systems enters aquatic systems and contributes to 
            
117
eutrophication, habitat degradation and loss of biodiversity. 
117
eutrophication, habitat degradation and loss of biodiversity. 
            
118
Denitrification bioreactors, in combination with controlled drainage, 
118
Denitrification bioreactors, in combination with controlled drainage, 
            
119
are proposed as a means of reducing nitrogen emitted through 
119
are proposed as a means of reducing nitrogen emitted through 
            
120
subsurface agricultural drainage systems, but their suitability in 
120
subsurface agricultural drainage systems, but their suitability in 
            
121
colder climates where soils and drainage systems freeze during winter 
121
colder climates where soils and drainage systems freeze during winter 
            
122
is poorly understood. This study presents the first field scale 
122
is poorly understood. This study presents the first field scale 
            
123
evaluation of denitrification bioreactors under cold climate 
123
evaluation of denitrification bioreactors under cold climate 
            
124
conditions during a three-year period in Quebec, Canada. Under a 
124
conditions during a three-year period in Quebec, Canada. Under a 
            
125
three-year crop rotation, about 55% of the total annual subsurface 
125
three-year crop rotation, about 55% of the total annual subsurface 
            
126
drainage water passed through bioreactors, which significantly lowered 
126
drainage water passed through bioreactors, which significantly lowered 
            
127
the total-nitrogen (72%) and nitrate-nitrogen (99%) median 
127
the total-nitrogen (72%) and nitrate-nitrogen (99%) median 
            
128
concentrations in thesubsurface drainage outflows. Loadings of 
128
concentrations in thesubsurface drainage outflows. Loadings of 
            
129
nitrate-nitrogen from the test fields to surface drainage ditches were 
129
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 
130
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 
131
removal in the test area and approximately 7 g nitrate-nitrogen 
            
132
removal m 3 bioreactor volume d 1. Aquatic environmental criteria 
132
removal m 3 bioreactor volume d 1. Aquatic environmental criteria 
            
133
non-compliance events declined by 96% for nitrate-nitrogen and by 50% 
133
non-compliance events declined by 96% for nitrate-nitrogen and by 50% 
            
134
for total-nitrogen during the three-year study. This study 
134
for total-nitrogen during the three-year study. This study 
            
135
demonstrates that denitrification bioreactors, combined with 
135
demonstrates that denitrification bioreactors, combined with 
            
136
controlled drainage, are an effective in-field technology for nitrogen 
136
controlled drainage, are an effective in-field technology for nitrogen 
            
137
removal from agri cultural subsurface drainage water that will improve 
137
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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