Avaliação da ação de fertilizantes foliares na recuperação da fitotoxidade causada pelo uso do glifosato em plantas de soja (Glycinemax (l.) Merrill)

Abstract

The soybean (Glycine Max (L.) Merrill) is presented as one of the most important commodities of brazilian agribusiness. Along with the use of genetically modified soybeans (Roundup Ready - RR/Monsanto) intensified the application of glyphosate herbicide. The indiscriminate use of this herbicide can lead to occurrence of nutritional and metabolic disorders in the plant or even to phytotoxicity. The objective of this study was evaluate action of different foliar fertilizers in the recovery of phytotoxicity caused by glyphosate use on soybean plants. The experiment was performed in the county of Itambe - PR with the completely randomized design (CRD), which was applied 795g i.a ha-1 of glyphosate. The experiment was compound of fifteen portions of 4 x 4 meters, and evaluated three treatments (T1=Product 1, T2=Product 2, T3=witness). The product 1 (N=1%, Mg=0.50% S=2.3%, B=0.20%, Co=0.30%, Mn=4% Mo=3%, Zn=2 %) was applied at the dosage of 1.25 L ha-1 and Product 2 (N=1.5%, K2O=5%, B=0.08% Fe=0.4%, Mn=1% S=1%, Zn=2%, Organic Carbon total=3.5%) applied at the dosage of 290 ml ha-1 . The following variables were analyzed: plant height, fresh weight of aerial part, and amount of seed and pods per plant, thousand seeds weight, yield and grain moisture. The productivity was significantly affected by use of both products, being that the Product 1 (3978.0 Kg/ha) and Product 2 (3799.8 kg/ha) showed higher values compared to Witness (2870.0 kg/ha), indicating that the two products can have efficiency in the correction of phytotoxicity, causing future productivity gains.