Campus Units

Agronomy, Statistics, Horticulture

Document Type

Article

Publication Version

Accepted Manuscript

Publication Date

12-23-2019

Journal or Book Title

Agronomy Journal

DOI

10.1002/agj2.20108

Abstract

The inclusion of perennial groundcover (PGC) in maize production offers a tenable solution to natural resources-related concerns associated with conventional maize; however, insight into system management and key information gaps is needed to guide future research. We therefore extended the Agricultural Production Systems sIMulator (APSIM) to an annual and perennial intercrop by integrating annual and perennial APSIM modules. These were parameterized for Kentucky bluegrass (KB) (Poa pratensis L.) or creeping red fescue (CF) (Festuca rubra L.) as PGC using a three-year dataset. Our objectives for this intercropping modeling study were to: i) simultaneously model a PGC and annual cash crop using APSIM software; ii) utilize APSIM to understand interactive processes in the maize-PGC system; and iii) utilize the calibrated model to explore both production and environmental benefits via scenario modeling. For objective I, the integrated model successfully predicted maize total aboveground biomass (TAB) (relative root mean square error, RRMSE of 13- 27%) and PGC above- and belowground tissue N concentration (RRMSE of 11-18%). The calibrated model effectively captured observed trends in PGC biomass accumulation and soil nitrate (NO3). For objective II, model analysis showed that competition for light was the primary maize yield penalty factor from PGC, while water and N impacted maize yield later in the maize growing season. In objective III, we concluded that effective PGC suppression produces minimal maize yield loss and significant environmental benefits; conversely, poor groundcover suppression may produce unfavorable environmental consequences and decrease maize grain yield. Effective PGC suppression is key for long-term system success.

Comments

This is a manuscript of an article published as Bartel, C. A., Sotirios V. Archontoulis, Andrew W. Lenssen, Kenneth J. Moore, Isaiah L. Huber, David A. Laird, S. Fei, and P. M. Dixon. "Modeling perennial groundcover effects on annual maize grain crop growth with APSIM." Agronomy Journal (2019). doi: 10.1002/agj2.20108. Posted with permission.

Copyright Owner

The author(s). Re-use requires permission from the publisher.

Language

en

File Format

application/pdf

Available for download on Wednesday, December 23, 2020

Published Version

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