Agricultural Impacts of Glyphosate-Resistant Soybean Cultivation in South America

被引:48
作者
Cerdeira, Antonio L. [1 ]
Gazziero, Dionsio L. P. [2 ]
Duke, Stephen O. [3 ]
Matallo, Marcus B. [4 ]
机构
[1] ARS, Brazilian Dept Agr, EMBRAPA Environm, BR-13820000 Jaguariuna, SP, Brazil
[2] ARS, Brazilian Dept Agr, EMBRAPA Soybean, Londrina, Parana, Brazil
[3] ARS, Nat Prod Utilizat Res Unit, USDA, University, MS 38677 USA
[4] Inst Biol, Weed Sci Lab, Campinas, SP, Brazil
关键词
glyphosate; weed resistance; South America; soybean; transgenic crops; FLEABANE CONYZA-BONARIENSIS; GENETICALLY-MODIFIED CROPS; BIOTYPES RESISTANT; WEED MANAGEMENT; NO-TILL; CANADENSIS; SOIL; PESTICIDES; HERBICIDES; MICROORGANISMS;
D O I
10.1021/jf102652y
中图分类号
S [农业科学];
学科分类号
082806 [农业信息与电气工程];
摘要
In the 2009/2010 growing season, Brazil was the second largest world soybean producer, followed by Argentina. Glyphosate-resistant soybeans (GRS) are being cultivated in most of the soybean area in South America. Overall, the GRS system is beneficial to the environment when compared to conventional soybean. GRS resulted in a significant shift toward no-tillage practices in Brazil and Argentina, but weed resistance may reduce this trend. Probably the highest agricultural risk in adopting GRS in Brazil and South America is related to weed resistance due to use of glyphosate. Weed species in GRS fields have shifted in Brazil to those that can more successfully withstand glyphosate or to those that avoid the time of its application. Five weed species, in order of importance, Conyza bonariensis (L.) Cronquist, Conyza canadensis (L.) Cronquist, Lolium multiflorum Lam., Digitaria insularis (L.) Mez ex Ekman, and Euphorbia heterophylla L., have evolved resistance to glyphosate in GRS in Brazil. Conyza spp. are the most difficult to control. A glyphosate-resistant biotype of Sorghum halepense L. has evolved in GRS in Argentina and one of D. insularis in Paraguay. The following actions are proposed to minimize weed resistance problem: (a) rotation of GRS with conventional soybeans in order to rotate herbicide modes of action; (b) avoidance of lower than recommended glyphosate rates; (c) keeping soil covered with a crop or legume at intercrop intervals; (d) keeping machinery free of weed seeds; and (d) use of a preplant nonselective herbicide plus residuals to eliminate early weed interference with the crop and to minimize escapes from later applications of glyphosate due to natural resistance of older weeds and/or incomplete glyphosate coverage.
引用
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页码:5799 / 5807
页数:9
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