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Title: METHOD AND TIMING OF RYE CONTROL AFFECTS SOYBEAN DEVELOPMENT AND RESOURCE UTILIZATION

Author
item WESTGATE, LESLIE - IA STATE UNIVERSITY
item Singer, Jeremy
item Kohler, Keith

Submitted to: ASA-CSSA-SSSA Annual Meeting Abstracts
Publication Type: Abstract Only
Publication Acceptance Date: 11/4/2004
Publication Date: 11/4/2004
Citation: Westgate, L.R., Singer, J.W., Kohler, K.A. 2004. Method and timing of rye control affects soybean development and resource utilization [CD-ROM]. Madison, WI. ASA-CSSA-SSSA Annual Meeting Abstracts.

Interpretive Summary:

Technical Abstract: Cover crops provide environmental and soil quality benefits, yet their adoption into production agriculture has been limited. This study was conducted to determine whether differences exist in soybean [Glycine max (L.) Merr.] resource utilization and development following a rye (Secale cereale L.) cover crop. The effects of mechanical and chemical rye control at 2nd node, boot, and anthesis on soil water, light interception, and soybean growth were investigated near Boone, IA in 2002 and 2003. At day of year (DOY) 226 and 230 in 2002 and 2003, light interception was 51, 72, 91, and 94% and 67, 75, 94, and 97% in chemical and 45, 53, 52, and 96% and 72, 70, 73, and 95% in mechanical control for 2nd node, boot, anthesis, and control treatments. At DOY 241 in 2002, chemical control accumulated 695, 692, 840, and 962 compared to 219, 328, 325, and 1126 g m-2 dry matter in mechanical control for 2nd node, boot, anthesis, and control treatments. At DOY 239 in 2003, 2nd node, boot, anthesis, and the control accumulated 395, 443, 380, and 637 g m-2 dry matter. Rye delayed pod maturity in 2002 by 6.3, 6.8, and 6.3 d in chemical and 8.3, 7.0, and 6.8 d in mechanical control for 2nd node, boot, and anthesis treatments compared to the control and by 5.3, 5.0, and 3.8 d in 2003. Producers who adopt these methods of rye management can expect delayed maturity and reduced biomass accumulation.