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ARS Home » Midwest Area » Morris, Minnesota » Soil Management Research » Research » Publications at this Location » Publication #78680
Title: GREEN (SETARIA VIRIDIS) AND YELLOW (SETARIA GLAUCA) FOXTAIL SEED PRODUCTIONIN A CORN/SOYBEAN ROTATION UNDER DIFFERENT TILLAGE SYSTEMS

Author
item KEGODE, GEORGE - UNIVERSITY OF MINNESOTA
item Forcella, Frank

Submitted to: Meeting Abstract
Publication Type: Abstract Only
Publication Acceptance Date: 2/6/1997
Publication Date: N/A
Citation: N/A

Interpretive Summary:

Technical Abstract: Research was conducted to determine the influence of time of weed emergence, tillage system, and crop being grown on panicle production, panicle size, and quantity of viable seeds produced by green and yellow foxtail plants. A field experiment was conducted where three emergence cohorts each for green and yellow foxtail were established in corn and soybean plots based on their time of emergence in relation to that of the crop (before crop, with crop, after crop). Corn and soybeans were raised under five tillage systems: conventional till (CT), fall chisel (FC), ridge till (RT), spring disk (SD), and zero till (ZT). All foxtail panicles and seed were collected prior to crop harvest for determination of number of panicles, average size of panicles, and total seeds produced per plant. Green foxtail plants produced most panicles and seeds in ZT (Corn), and in CT(Soybeans). Yellow foxtail produced most panicles and seed in CT (Corn and Soybeans). There was little variation in panicle size, however yellow foxtail produced significantly longer panicles in corn than in soybeans. Green foxtail consistently produced more seed than yellow foxtail, but was less sensitive to time of emergence than yellow foxtail, except in soybean. A higher level of control is necessary to prevent increases in the seedbanks of green and yellow foxtail growing under ZT and CT systems, respectively. Time of weed emergence affects seed production far more in yellow foxtail than in green foxtail. Although yellow foxtail produces more panicles, green foxtail produces more seed regardless of tillage system and crop. FC and SD tillage systems appear to have identical effects on panicles and seeds of both green and yellow foxtail.