Growsafe Environmental Protection 1 — Questions and Answers
Question 1: What is 'spray drift' and why is it an environmental concern?
- The movement of spray droplets or vapour away from the target area, potentially contaminating non-target crops, waterways, or habitats (Correct answer)
- A measurement of the distance a spray boom covers in a single pass
- The process by which agrichemicals move into the soil profile
- The pattern of spray deposition on a target surface
Correct answer: The movement of spray droplets or vapour away from the target area, potentially contaminating non-target crops, waterways, or habitats
Spray drift occurs when fine droplets or vapour move beyond the intended target area under wind or atmospheric conditions, potentially harming neighbouring crops, waterways, wildlife, and people.
Question 2: What is a 'buffer zone' in agrichemical application?
- A minimum distance from sensitive features such as waterways, neighbours' properties, or conservation areas within which application is restricted (Correct answer)
- A zone inside the treated area where application rates must be reduced
- The area between the spray boom and the crop canopy
- The area immediately around the spray operator where PPE must be worn
Correct answer: A minimum distance from sensitive features such as waterways, neighbours' properties, or conservation areas within which application is restricted
Buffer zones protect sensitive features by requiring a minimum distance to be maintained between the application site and the sensitive feature. They are specified on the product label and may be supplemented by regional council rules.
Question 3: Which agrichemical application practices help minimise the risk of waterway contamination?
- Observing label buffer zones, applying in calm conditions, and avoiding application before forecast rain (Correct answer)
- Applying at higher rates to compensate for potential runoff losses
- Applying only in wet conditions so the product is diluted
- Increasing spray pressure to reduce the time near waterways
Correct answer: Observing label buffer zones, applying in calm conditions, and avoiding application before forecast rain
Buffer zones, calm weather application, and timing to avoid pre-rain application all reduce the risk that product will drift, run off, or leach into waterways.
Question 4: What is 'leaching' in the context of agrichemical environmental impact?
- The movement of agrichemicals through soil into groundwater (Correct answer)
- The evaporation of agrichemicals from treated surfaces into the air
- The breakdown of agrichemicals by soil microorganisms
- The movement of agrichemicals from leaves into plant tissue
Correct answer: The movement of agrichemicals through soil into groundwater
Leaching is the downward movement of agrichemicals through the soil profile, potentially reaching groundwater and contaminating drinking water supplies and aquatic ecosystems.
Question 5: What environmental hazard classification on an agrichemical label indicates risk to aquatic life?
- Environmental Hazard Class 9 — Aquatic Ecotoxicity (Correct answer)
- Environmental Hazard Class 3 — Aquatic Ecotoxicity
- Class P (Persistence) only
- Class W (Water) — there is no numerical system for aquatic hazards
Correct answer: Environmental Hazard Class 9 — Aquatic Ecotoxicity
Under the HSNO classification system, Class 9 refers to substances that are ecotoxic to the aquatic environment. Labels carry this classification to warn users of the risk and trigger buffer zone requirements near waterways.
Question 6: Why is it important to read the environmental hazard section of an SDS before applying an agrichemical near a stream?
- It specifies the aquatic toxicity and persistence of the product, informing buffer zone distances and precautions (Correct answer)
- It only covers terrestrial animal hazards, not aquatic hazards
- It tells you which fish species are most at risk but does not guide application decisions
- The SDS environmental section is relevant only to disposal, not application
Correct answer: It specifies the aquatic toxicity and persistence of the product, informing buffer zone distances and precautions
Section 12 of the SDS covers ecological information including aquatic toxicity and persistence, directly informing the precautions needed when applying near water.
Growsafe Environmental Protection 1
What is 'spray drift' and why is it an environmental concern?