Abstract
Corn (Zea mays L.) stover was identified as a renewable non-food agricultural feedstock for production of liquid fuels, biopower, and other bioproducts, but it is also needed for erosion control, carbon sequestration, and nutrient cycling. To help balance these multiple demands, our objectives were to (1) determine height distribution of corn stover biomass, (2) quantify the percentage of stover that is corn cob, and (3) develop a general relationship between plant harvest height and stover remaining in the field for a broad range of growing conditions, soil types, and hybrids in different regions. Plant height, dry grain, stover, and cob yield data were collected at eight US locations. Overall, stover yield increased about 0.85 Mg ha-1 and cob yield increased about 0.10 Mg ha-1 for each 1.0 Mg ha-1 increase in dry grain yield. At grain harvest, the stover-to-grain ratio ranged from 0.64 to 0.96 and cob-to-grain ratio ranged from 0.11 to 0.19. A strong nearly 1:1 linear (r 2 = 0.93) relationship between the relative cutting height and relative biomass remaining in the field was observed across all sites. These data were requested by the US Department of Agriculture-Natural Resource Conservation Service to help improve version 2 of the Revised Universal Soil Loss Equation (RUSLE2) and Wind Erosion Prediction System and better estimate corn stover harvest rates based on cutting height or selective organ harvest (e.g., grain and cob only). This information will improve the capacity of RUSLE2 and similar models to predict the erosion risk associated with harvesting corn residues.
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Abbreviations
- (GLM):
-
General linear model
- (HI):
-
Harvest index
- (RUSLE2):
-
Revised Universal Soil Loss Equation version 2
- (SOM):
-
Soil organic matter
- (USDA-ARS):
-
US Department of Agriculture-Agriculture Research Service
- (USDA-NRCS):
-
US Department of Agriculture-Natural Resource Conservation Service
- (WEPS):
-
Wind Erosion Prediction System
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Acknowledgements
The authors dedicate this publication to Dr. Wally Wilhelm for his foresight and dedication to protecting the soil resource while building a bioeconomy. He is sorely missed. We would like to thank Dr. Charles C. Mitchell (Dept. of Agronomy and Soils, Auburn University, AL) for allowing us to collect samples at The Old Rotation historic cotton research site. We also thank B. Burmeister for proof-reading the final version, but we take full responsibility for any errors. Publication costs were covered by funding from the North Central Regional Sun Grant Center at South Dakota State University through a grant provided by the US Department of Energy Office of Biomass Programs under award number DE-FC36-05GO85041.
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The author Wally W. Wilhelm is deceased.
The US Department of Agriculture offers its programs to all eligible persons regardless of race, color, age, sex, or national origin, and is an equal-opportunity employer.
The use of trade, firm, or corporation names in this publication is for the information and convenience of the reader. Such use does not constitute an official endorsement or approval by the United States Department of Agriculture or the Agricultural Research Service of any product or service to the exclusion of others that may be suitable.
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Wilhelm, W.W., Johnson, J.M.F., Lightle, D.T. et al. Vertical Distribution of Corn Stover Dry Mass Grown at Several US Locations. Bioenerg. Res. 4, 11–21 (2011). https://doi.org/10.1007/s12155-010-9097-z
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DOI: https://doi.org/10.1007/s12155-010-9097-z