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Published in Agron J 100:440-446 (2008)
DOI: 10.2134/agrojnl2007.0172
© 2008 American Society of Agronomy
677 S. Segoe Rd., Madison, WI 53711 USA
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Self-Seeded Cereal Cover Crop Effects on Interspecific Competition with Corn

Paul B. McDonalda, Jeremy W. Singerb,* and Mary H. Wiedenhoeftc

a NRCS, Webster County Field Office, 1202 Banning Street, Marshfield, MO 65706
b USDA-ARS, National Soil Tilth Lab.,2110 University Blvd., Ames, IA 50011
c Dep. of Agronomy, 1126D Agronomy Hall, Iowa State Univ., Ames, IA 50011


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  		Fig. 1. Photosynthetically active radiation (PAR) interception in 2005 and 2006 for cover crop species and management systems. Residual treatments in soybean in 2004 and 2005 were four rows with early (4REB) and late (4RLB) spring glyphosate to eliminate two 0.19-m rows and mechanical control, four 0.19-m rows with mechanical control (4RNB) only, two rows with mechanical control (2RB), and two rows with no mechanical control (2RBNC). All cover crop treatments received mechanical control using a rolling stalk chopper on 23 May 2005 (day of year 143) and 19 May 2006 (day of year 139). Photosynthetically active radiation interception by the cover crops was subtracted from the total PAR interception starting with the measurement on DOY 143 in 2005 and DOY 153 in 2006 to compare corn PAR interception. *Indicates a significant (P < 0.05) species by treatment interaction. ** Indicates a management treatment difference (P < 0.05) for rye in 2006 at the last two sampling dates.

 




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