Environmental Protection and Pesticide Handling/Disposal
Where pesticides go
Three transport pathways dominate exam questions. Drift is off-target movement through the air during application - influenced by droplet size, boom height, wind, and temperature inversions, which can carry fine droplets long distances even with little wind at ground level. Runoff is movement of pesticide or soil-bound pesticide across the soil surface with rain or irrigation, worst on slopes, compacted soils, and shortly after application. Leaching is downward movement through the soil profile into groundwater, worst with sandy, low-organic-matter soils, high water tables, highly soluble products, low soil adsorption, and long half-lives.
Product and soil factors
Learn the properties that govern behavior: water solubility, soil adsorption (Koc), persistence or half-life, volatility, and bioaccumulation potential. A product that is highly soluble, poorly adsorbed, and persistent is a groundwater concern. Volatile formulations and high temperatures raise vapor-drift risk.
Protecting sensitive sites
Read the environmental hazards section: it names the specific concern (groundwater, surface water, bees, endangered species) and any buffer or setback requirement. Avoid application when pollinators are foraging on flowering crops; apply in the evening when possible. Keep mixing and loading well away from wells, streams, and drains, and never leave a sprayer unattended while filling.
Spills, storage, and disposal
For a spill: protect yourself, stop the source, contain the material with absorbent or soil, cover or berm it, keep it out of storm drains and waterways, and follow the label and state guidance for cleanup and reporting. Never hose a spill into a drain. Store pesticides in a locked, ventilated area away from feed, seed, and food, in original labeled containers. Rinse containers thoroughly, add rinsate to the spray tank, and recycle or dispose of containers according to label and state rules.
Worked example
A label states, "Do not apply within 100 feet of surface water." A field edge borders a creek: measure from the high-water mark, shut off the boom there, and record it. Buffer distances are measured from the water, not the field boundary.