RESEARCH PAPER
Image-based modelling of the effect of s-metolachlor plus atrazine on the soaking kinetics of maize seeds
 
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1
Plant Protection Master Programme, Federal Goiano Institute, Geraldo Silva Nascimento Road Km 2.5, 75790-000, Urutai-GO, Brazil
2
Statistics and Geoprocessing Laboratory, Federal Goiano Institute, Geraldo Silva Nascimento Road Km 2.5, 75790-000, Urutai-GO, Brazil
CORRESPONDING AUTHOR
Anderson Rodrigo da Silva   

Statistics and Geoprocessing Laboratory, Instituto Federal Goiano, Rod. Geraldo Silva Nascimento, km 2.5, 75790-000, Urutai, Brazil
Final revision date: 2022-04-22
Acceptance date: 2022-05-23
Publication date: 2022-06-29
 
Int. Agrophys. 2022, 36(3): 155–161
 
HIGHLIGHTS
  • S-metolachlor + atrazine affects the imbibition and primary root of maize seeds.
  • Image-based imbibition curves are efficiently obtained and reveal the herbicide effects.
  • The absorption rate is severely reduced and germination can be fully inhibited.
  • Early preplant or preplant incorporated applications should be avoided.
KEYWORDS
TOPICS
ABSTRACT
Pre-emergent herbicides can have negative effects on maize seeds. The objective of this study was to model seed soaking curves through the processing of red-green-blue imagery of maize seeds under the influence of concentrations of s-metolachlor + atrazine on both the soaking kinetics and primary root emission. Seeds were placed to soak for 114 h in Petri dishes containing aqueous solutions of a herbicide containing s-metolachlor (290 g l–1) + atrazine (370 g l–1) with the following concentrations: 0% (water only), 2, 5, 10, 20 and 50%, based on the recommended dose (4.0 l of the commercial product per hectare). The images were systematically taken from a flatbed scanner with artificial light control. The red excess index was adapted to improve image segmentation. From the binary masks applied, the soaking curves for each herbicide concentration were obtained using estimates of seed intumescence over time. The soaking curves were described by fitting Peleg’s model. The herbicide concentration has significant effects on both the absorption rate and primary root emission; the absorption rate was reduced by 50%. A concentration of s-metolachlor (290 g l–1) + atrazine (370 g l–1) in aqueous solution that is above 20% can fully inhibit seed germination.
FUNDING
This work was supported by CNPq – National Council for Scientific and Technological Development (grant number: 309733/2021-9 (2022-2025)) and Federal Goiano Institute (process number: 23219.000752.2022-34 (2019 -2022))
CONFLICT OF INTEREST
The authors declare no competing financial interests or personal relationships that could have appeared to influence the content of this article.
 
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