J
John E. Sawyer
Researcher at Iowa State University
Publications - 223
Citations - 5085
John E. Sawyer is an academic researcher from Iowa State University. The author has contributed to research in topics: Fertilizer & Manure. The author has an hindex of 35, co-authored 214 publications receiving 4173 citations. Previous affiliations of John E. Sawyer include University of Illinois at Urbana–Champaign.
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Integrating plant litter quality, soil organic matter stabilization, and the carbon saturation concept
TL;DR: The model builds on the Microbial Efficiency-Matrix Stabilization framework by suggesting the effect of litter quality on SOM stabilization is modulated by the extent of soil C saturation such that high-quality litters are not always stabilized in SOM with greater efficiency than low- quality litters.
Journal ArticleDOI
Strengths and limitations of Nitrogen rate recommendations for corn and opportunities for improvement
Thomas F. Morris,Scott T. Murrell,Douglas B. Beegle,James J. Camberato,Richard B. Ferguson,John H. Grove,Quirine M. Ketterings,Peter M. Kyveryga,Carrie A. M. Laboski,Joshua M. McGrath,John J. Meisinger,Jeff Melkonian,Bianca N. Moebius-Clune,Emerson D. Nafziger,Deanna L. Osmond,John E. Sawyer,Peter C. Scharf,Walter Smith,John T. Spargo,Harold M. van Es,Haishun Yang +20 more
TL;DR: The goal of an N recommendation system is to accurately estimate the gap between the N provided by the soil and the N required by the plant as mentioned in this paper, which depends on the ability of the recommendation system to estimate fi eld or subfi eld specifi c economically optimal nitrogen rates (EONR).
Journal ArticleDOI
Concepts of Variable Rate Technology with Considerations for Fertilizer Application
TL;DR: If VRT is widely adopted, then a change must occur in the predominant management practice of applying inputs as uniformly as possible and changing rates only between fields-what has historically occurred on the majority of production fields.