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1. 
Cover image for Quantifying and understanding plant nitrogen uptake systems modeling
Quantifying and understanding plant nitrogen uptake systems modeling
Author 
Ma, Liwang. Ahuja, L. (Lajpat) Bruulsema, Thomas W.
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2. 
Cover image for Agricultural system models in field research and technology transfer
Agricultural system models in field research and technology transfer
Author 
Ahuja, L. (Lajpat) Ma, Liwang. Howell, Terry A.
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3. 
Cover image for Modeling carbon and nitrogen dynamics for soil management
Modeling carbon and nitrogen dynamics for soil management
Author 
Shaffer, M. J. (Marvin James), 1943- Ma, Liwang. Hansen, S. (Sr̜en), 1951-
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