Glyphosate‐Resistant Soybean Cultivar Response to Glyphosate

Abstract

Glyphosate (N-(phosphonomethyl) glycine)-resistant (GR) soy- Missouri, personal communication, 1999). bean [Glycine max (L.) Merr.] technology is gaining acceptance in U.S. cropping systems, yet potential yield suppression from eitherYield suppression may result from either (i) cultivar cultivar genetic differentials, the GR gene/gene insertion process, or genetic differentials, (ii) the GR gene/gene insertion glyphosate is a concern. Other work shows that the GR gene/gene process (GR effect), or (iii) glyphosate (herbicide efinsertion process may suppress soybean yield. No one has reported fect), or a combination of the three. Thus, in the first the effects of glyphosate on a diverse group of commercially available situation yield of GR cultivars may be suppressed rela-GR soybean cultivars. In this study we evaluated one of the potential tive to that of other cultivars simply because the GR sources of GR yield suppression-the effect of glyphosate on yield, gene was inserted in low yielding or older cultivars. We growth, and development of GR cultivars. Field experiments were consider yield suppression associated with the GR effect conducted at four Nebraska locations with12 GR cultivars in 1998 and or herbicide effect a greater potential problem than 13 GR cultivars in 1999. Soybean response to glyphosate, ammonium cultivar genetic differentials since the latter can be oversulfate (AMS), and water application at 21 and 42 d after soybean emergence was compared with control plots treated with AMS and come by inserting the GR gene in high yielding parent water in 1998. An additional control, water alone, was added in 1999.

Selectivity of glyphosate in tank mixtures for RR soybean in sequential applications with mixtures only in the first or second application

“…Toxicity symptoms recovery from herbicide mixtures with glyphosate or isolated glyphosate for glyphosate-resistant soybean is reported by several authors such as Lich et al (1997), Gonzini et al (1999), Elmore et al (2001), Grey & Raymer (2002), Ellis & Griffin (2003), Norsworthy (2004) and Procópio et al (2007).…”

Seletividade de diferentes herbicidas à base de glyphosate a soja RR

“…Entretanto, não há relatos na literatura sobre reduções significativ as na produtividade de grãos (Elmore et al, 2001;Krausz & Young, 20 O sal de glyphosate utilizado no desenvolvimento da soja tolerante foi o de isopropilamina. Nos Estados Unidos, em 1999, o sal de trimetilsulfônio também obteve registro para uso em soja geneticamente modificada.…”

Selectivity of glyphosate tank mixtures for RR soybean

“…However, phytotoxicity effects observed during crop cycle were mostly transitory with varying persistence. Toxicity symptom recovery from herbicide treatments containing glyphosate in glyphosate-resistant soybean has been reported by several authors such as Lich et al (1997), Gonzini et al (1999), Elmore et al (2001), Grey & Raymer (2002), Ellis & Griffin (2003), Norsworthy (2004), and Procópio et al (2007). The mixtures caused a higher level of injuries at 3 DAA than any rate of glyphosate alone.…”