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Subject: Soils Nitrogen content
Institution
Collection
Subject
Soils Nitrogen content
12
Nitrogen Fixation
3
Nitrogen cycle
3
Plant-soil relationships
3
Plants Effect of nitrogen on
2
Nitrification
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2
Nitrogen fertilizers
2
Soil chemistry
2
Soils Carbon content
2
Soils Phosphorus content
2
Water Nitrogen content
2
Water quality
1
Agricultural pollution
1
Agriculture
1
Arnica
1
Atmospheric nitrous oxide
1
Clearcutting
1
Crops and nitrogen
1
Geobiology
1
Greenhouse gas mitigation
1
Humus
1
Meteorology
1
Meteorology Diurnal variations
1
Meteorology Research
1
Microbiology
1
Mulching
1
Nature Effect of human beings on
1
Nitrates Environmental aspects
1
Nitrogen Analysis
1
Nitrogen Environmental aspects
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Author
9
Colorado Agricultural Experiment Station
6
Headden, William P. 1850-1932
3
Geological Survey (U.S.)
3
SpringerLink (Online service)
2
Geological Survey (U.S.),
2
Kearney Foundation
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2
Nielsen, Donald R., 1931-
2
ScienceDirect (Online service)
1
Agricultural System Competitiveness and Sustainability National Program (U.S.)
1
Benckiser, Gero,
1
Berryman, Erin M.,
1
Black, T. A.
1
Bracmort, Kelsi,
1
Charteris, Alice Fiona,
1
Choudhary, Devendra K.,
1
Cruz, Cristina, 1964-
1
Dennen, Kristin O.
1
Gardner, Robert Alexander
1
Garrett, Jessica D.,
1
Gronberg, JoAnn M.,
1
Hansen, Jens Aage, 1938-
1
Harden, J. W. 1954-
1
Haynes, R. J.
1
Henriksen, Kaj
1
Hinkle, Margaret E.
1
Iowa. Department of Natural Resources,
1
Kezer, Alvin, 1877-
1
Lal, R.
1
Library of Congress. Congressional Research Service,
1
MacDonald, J. G.
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