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ARS Home » Southeast Area » Stoneville, Mississippi » Crop Genetics Research » Research » Publications at this Location » Publication #132558
Title: WEED MANAGEMENT SYSTEMS FOR CONVENTIONAL AND GLYPHOSATE-RESISTANT SOYBEAN FOLLOWING RICE

Author
item Heatherly, Larry
item SPURLOCK, STAN - MISS. STATE UNIV.
item Elmore, Carroll

Submitted to: Mississippi Agricultural and Forestry Experiment Station Technical Bulletin
Publication Type: Peer Reviewed Journal
Publication Acceptance Date: 10/1/2003
Publication Date: 10/10/2003
Citation: Heatherly, L.G., Spurlock, S.R., Elmore, C.D. 2003. Weed management systems for conventional and glyphosate-resistant soybean following rice. Mississippi Agricultural and Forestry Experiment Station Technical Bulletin. No. 1135.

Interpretive Summary: The Early Soybean Production System (ESPS) has been adopted in the midsouthern US. A large acreage in this region is cropped using a 1:1 rotation of rice: soybean. Determination of the profitability of using the ESPS for conventional and glyphosate-resistant soybean varieties grown in rotation with rice and under weed management with and without preemergent inputs has not been investigated. Three years of field studies determined that ESPS soybean following rice will be more profitable if postemergent-only weed management is used with both conventional and glyphosate-resistant soybean varieties.

Technical Abstract: Weed management inputs that maximize economic return from Early Soybean Production System (ESPS) plantings following rice have not been evaluated. Field experiments were conducted from 1999 through 2001 on Sharkey clay soil at Stoneville, MS (33 deg. 26'N lat.). Objectives were to determine the agronomic performance of and economic return from April-planted, irrigated, conventional (CONV) and glyphosate-resistant (GR) soybean [Glycine max (L.) Merr.] cultivars grown in rotation with rice (Oryza sativa L.) under two weed management systems. Weed management systems were: 1) PRE broadleaf and grass followed by POST broadleaf and grass herbicides (PRE + POST); and 2) POST broadleaf and grass herbicides (POST). Lowest cost weed management resulted from using GR cultivars with POST glyphosate, while the highest cost weed management resulted from using GR cultivars with PRE + POST. Under the conditions of this study, use of CONV cultivars resulted in greater profit than use of GR cultivars. Use of POST vs. PRE + POST weed management with GR and CONV cultivars resulted in greater yields and net returns. Results from this study indicate that greater profit from growing soybean rotated with rice will result from using CONV vs. GR cultivars and POST vs. PRE + POST weed management.