Agricultural Safety, Ergonomics and Occupational Health
Agricultural Safety, Ergonomics and Occupational Health covers hazards in farm power, machinery, chemicals, livestock and manual work, and the design of tasks to fit people. The exam tests hazard recognition, guarding, PPE, pesticide safety, noise and ergonomic risk assessment.
Core rules
- Tractor and machinery hazards: entanglement at PTO and belts, crushing at hitch and drawbar, run-over, and hydraulic injection. Guards and shields must remain in place.
- ROPS protects only when the seat belt is worn; an unbolted or folded ROPS offers no roll-over protection.
- PTO drivelines need master shields and restraining chains; never step over a rotating shaft.
- Pesticide safety follows the label: correct dose, PPE, wind and re-entry interval, separate storage, and safe container disposal.
- Ergonomics: keep work heights near elbow level, reduce lifts, use handles and carts, and rotate repetitive tasks.
- Noise, dust, heat and vibration are cumulative hazards; monitor exposure and provide controls at source first.
Worked example
A worker spends 4 hours at 95 dBA and 4 hours at 85 dBA. Using a 5 dB exchange rate, allowable time at 95 dBA is 4 hours, and at 85 dBA is 8 hours. Noise dose = 4/4 + 4/8 = 1.0 + 0.5 = 1.5, or 150%. This exceeds 100%, so hearing protection and noise reduction are needed. Reasoning: dose is the sum of time fractions against permissible time, not a simple average of decibels.
Traps
Do not average dBA values arithmetically; use the exchange rate and dose. Do not treat PPE as the first control-elimination, guarding and engineering controls come first. Do not wear loose clothing near PTOs. Do not re-enter a sprayed field before the label interval, even if the surface looks dry.