Atrazine residues in flooded and nonflooded soil and effects on soybean

Thomas C Mueller,Lawrence E Steckel,David R Kincer

doi:10.1017/wet.2020.107

Thomas C Mueller, Lawrence E Steckel + Show 1 more

Open Access

https://doi.org/10.1017/wet.2020.107

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Journal: Weed Technology	Publication Date: Sep 22, 2020
Citations: 2	License type: CC BY 4.0

Affiliation: University of Tennessee at Knoxville

Abstract

AbstractAtrazine applied at planting is commonly used for weed control in corn. With global climate change causing an increase in river flooding in the United States over the past decade, producers need information to determine the best course of action in flooded fields treated with atrazine into which they wish to immediately plant soybean. Studies were designed to understand the effect of flooding on atrazine residual activity including atrazine concentration, soybean injury, and soybean yield. In 2012, soybean yield in flooded treatments was reduced by prior atrazine application. In 2014, soybean injury was <10% in all plots, and nonflooded, atrazine-treated soils had yields equal to the nontreated. Findings from this research indicated that it is possible for producers to consider replanting soybean after atrazine application, with appropriate changes to product labeling.

Highlights

Atrazine is a commonly used herbicide providing PRE and POST weed control in corn, sorghum [Sorghum bicolor (L.) Moench], and sugarcane (Saccharum officinarum L.) (Mitchell 2014)
Data were subjected to ANOVA in SAS (v. 9.2, SAS® Institute Inc., Cary, NC) using PROC GLIMMIX to test for significance of atrazine rate and flooding treatment on atrazine concentration in soils, soybean injury, and yield
Atrazine concentration was greatest in soils treated with the higher rate of atrazine, with about 35% less atrazine recovered in soils treated with the lower rate

Summary

Introduction

Atrazine is a commonly used herbicide providing PRE and POST weed control in corn, sorghum [Sorghum bicolor (L.) Moench], and sugarcane (Saccharum officinarum L.) (Mitchell 2014). In the absence of flooding, atrazine persistence would be expected to prevent subsequent soybean planting as a result of crop injury. 9.2, SAS® Institute Inc., Cary, NC) using PROC GLIMMIX to test for significance of atrazine rate and flooding treatment on atrazine concentration in soils, soybean injury, and yield.

Results

Conclusion