Abstract
Glyphosate-Resistant Crops (GR crops) have caused considerable changes in weed management worldwide. In Brazil, GR cultivars of soybean and corn were officially introduced in the 2005/06 and 2011/12 crops, respectively. This technology has radically changed the weed management system, having an enormous impact on national agriculture. The objective of this review was to analyze the general aspects that led to the adoption of this technology in Brazil and present its future consequences and challenges. The adoption of GR soybean [...]
Highlights
Soybean and corn are the two crops with the largest production areas in Brazil.In the 2020/2021 cropping season, soybeans were cultivated on 38.5 million ha, with an estimated production of 135.9 million tons, while corn was grown on19,305,900 ha, with an estimated production of 85.7 million tons (CompanhiaNacional de Abastecimento, 2021)
The main herbicides used in this operation are the broad-spectrum, non-selective ones, mainly glyphosate, applied alone or in association with other herbicides to improve its spectrum on hard-to-control weeds (Procópio et al, 2006)
The glyphosate applications are single, without sequential herbicide applications, and have become increasingly closer to the crop sowing, without the proper formation of mulch on the soil, which is recommended in the no-till system (Fidelis et al, 2003)
Summary
Soybean and corn are the two crops with the largest production areas in Brazil.In the 2020/2021 cropping season, soybeans were cultivated on 38.5 million ha, with an estimated production of 135.9 million tons, while corn was grown on19,305,900 ha, with an estimated production of 85.7 million tons (CompanhiaNacional de Abastecimento, 2021). Soybean and corn are the two crops with the largest production areas in Brazil. In the 2020/2021 cropping season, soybeans were cultivated on 38.5 million ha, with an estimated production of 135.9 million tons, while corn was grown on. In most regions of Brazilian, soybean and corn are grown under a no-till system, which stands out for its conservationist origin. Before sowing soybean and corn, weed control is exclusive with herbicides in a procedure known as burndown (Roman, 2002). The main herbicides used in this operation are the broad-spectrum, non-selective ones, mainly glyphosate, applied alone or in association with other herbicides to improve its spectrum on hard-to-control weeds (Procópio et al, 2006). After burndown, weed control was carried out with selective herbicides applied either in pre or in post-emergence of crops
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