Selectivity of metsulfuron applied to soybean before sowing in different intervals and soils

Abstract

This work aimed to evaluate the selectivity of the herbicide metsulfuron applied at different times on the development of soybeans grown in soils with different characteristics. The experiment was conducted in a randomized block design, in a factorial scheme (4 x 4), with four replicates. Factor A was application time (0, 15, 30, and 45 days before sowing, DBS) and factor B was soil type (Erechim, Itaqui, Piratini, and Santa Maria). Soybean plants cultivated in the Erechim soil showed moderate phytotoxicity, with greater damage to the leaf area and plant dry matter, mainly after application at 30 DBS. Those cultivated in Itaqui soil showed gradual phytotoxicity between 14 and 28 days after emergence (DAE). Soybean plants grown in the Piratini and Santa Maria soils showed the highest phytotoxicity and photosynthetic reduction, mainly at 15 and 0 DBS. Metsulfuron application at 45 DBS caused reduced plant growth by up to 40%, and reduced shoot development (30%) in soybean plants grown in Piratini and Santa Maria soils, respectively. There were gradual changes in phytotoxicity and the morphophysiological traits of soybean plants exposed to the residual effect of metsulfuron in different soils, which indicates that soybeans should be sown more than 45 days after the application of metsulfuron, regardless of soil characteristics.

Graphical Abstract

Keywords:

• ALS inhibitors
• sulphonylurea
• carryover
• soil persistence

Disclosure statement

No potential conflict of interest was reported by the authors.

Additional information

Funding

The author thanks the National Council for Scientific and Technological Development (CNPq) and Federal University of Fronteira Sul (UFFS) for financial support. J.D.G Silva and C. Müller are grateful to the Coordination for the Improvement of Higher Education Personnel (CAPES) and L. Galon to the CNPq for fellowships.