Iowa Pesticide Applicator Practice Exam

What is the maximum application rate for atrazine in most Iowa counties?

1. 3 lbs per acre per year

2. 2.5 lbs per acre per year

3. 1 lb per acre per year

4. No limit on application

The correct answer is: 2.5 lbs per acre per year

The maximum application rate for atrazine in most Iowa counties is set at 2.5 lbs per acre per year due to regulations aimed at protecting water quality and reducing the likelihood of atrazine runoff into waterways. This limit is established based on observations regarding the chemical's persistence in the environment and its potential impact on drinking water sources. Atrazine is a widely used herbicide, particularly in corn production, but its leaching potential into groundwater and surface water has raised concerns. Limiting the application rate helps to manage these environmental risks while still allowing farmers to utilize effective weed control practices. Other application rates, such as 1 lb or 3 lbs per acre, do not reflect the current regulatory framework and can lead to increased environmental consequences. Not having a limit on application could exacerbate pollution and ecological issues, which is why a clear threshold is established and enforced. This balance helps ensure that atrazine can be used effectively while safeguarding natural resources.