Acúmulo de nutrientes e matéria seca na parte aérea de dois cultivares de soja RR sob efeito de formulações de glyphosate

Abstract

Palavras-chave: Glycine max, herbicida, inibidores da EPSPs, nutrição, seletividade.ABSTRACT -The study of selectivity and secondary effects of herbicides on crops is extremely important to successful agriculture. This research aimed to evaluate the effect of glyphosate formulations on nutrient accumulation and dry matter production on the shoot of two glyphosateresistant (GR) soybean cultivars. The assay was carried out in a greenhouse and arranged in a randomized complete block design, replicated six times. The treatments were in a factorial arrangement including six glyphosate formulations (Roundup Original , plus a control treatment, and two soybean cultivars (CD 225 RR and V Max RR). The herbicide applications were performed when the plants were at the V3 growth stage, using a dose of 960 g a.e. ha -1 . The macronutrient and micronutrient accumulation and dry matter production in the shoot of the soybean plants were greater in V Max RR cultivar than in CD 225 RR cultivar. The formulations Roundup Ready ® and Roundup Ultra ® did not promote nutrient accumulation reduction in the shoot of the cultivars. In addition, the formulations Roundup Original ® , Roundup Transorb ® and Roundup WG ® caused the greatest damage to nutrient accumulation and dry matter production. It was concluded that nutrient accumulation and dry matter production in the shoots of the soybean plants are affected by glyphosate application, even for GR cultivars.

Behavior of RR soybeans subjected to different formulations and rates of glyphosate in the reproductive period

“…These results are directly related to those discussed by several authors, probably because they are connected or arise from potential injury, or even from the harmful effects of glyphosate and its metabolites, as found in the literature Zablotowicz & Reddy, 2004;Santos et al, 2007;Zablotowicz & Reddy, 2007;Zobiole et al, 2010a,b,c;Albrecht, et al, 2011a,b;Albrecht et al, 2012a,b;Cavalieri et al, 2012).…”

<b>Harvest growth stages in soybean cultivars intended for silage

“…After each harvest, 5 plants of each plot were separated into branches, leaves and pods for weighing and determining the wet mass of each component (WMB; WML; WMP); then the plants of the plot were ground to obtain the ground natural matter (GNM). After this, the material was dried in a forced air circulation oven at 60°C to determine the dry weight of branches, leaves and pods and the dry weight of the composite sample (DWB; DWL; DWP; DWCS) according to the methodologies used by Neumann et al (2011); Calvo, Simoneti, and Brancalião (2010) and Cavalieri, Velini, Silva, São José, and Andrade (2012).…”

Impacts of glyphosate-based herbicides on disease resistance and health of crops: a review

“…Thus, the impacts of GBHs on plants and other organisms may differ substantially from those of glyphosate and its salts, commonly the isopropylamine salt [ 17 – 19 ]. In turn, different GBH formulations have been shown to exert different effects on crops [ 20 ]. We endeavour throughout this review to cite the specific formulations used in experiments (e.g.…”

“…However, a small number of studies have reported significant disruptions to GR crop nutrition, as well as declines in plant biomass production, chlorophyll content and photosynthetic rate, associated with GBH treatments at the recommended herbicidal dosage to GR crops [ 20 , 79 , 92 – 96 ]. These studies and their main findings are summarised as follows.…”