Agricultural and Life Industries
Scope
Agricultural and Life Industries tests how crop, livestock, soil, and farm-management principles are applied in production decisions. Expect questions on growth environments, breeding, pest and disease control, sustainable practices, and farm records.
Core rules
- Photosynthesis drives yield: light, CO2, water, and nutrients interact; a limiting factor cannot be offset by excess of another.
- Soil pH changes nutrient availability; most field crops perform best near pH 6.0-7.0, but crop-specific ranges matter.
- Integrated pest management uses monitoring, economic thresholds, biological and cultural controls before chemical treatment.
- Pure live seed (PLS) adjusts seeding rate for germination and purity, not just seed weight.
Worked example
A 100 m2 plot needs 30 plants/m2. Germination is 90% and purity is 95%, so the PLS fraction is 0.90 x 0.95 = 0.855. Required viable seeds = 30 x 100 / 0.855 = 3,509 seeds. With a thousand-seed weight of 40 g, seed mass = 3,509 x 40 / 1,000 = 140 g. Reasoning: first convert the target population to viable seeds, then convert seeds to weight.
Traps
Using germination alone overstates PLS and undersows. Adding nitrogen without a soil test can worsen lodging or pollution. Treating stocking density as a fixed number ignores animal weight, ventilation, and water quality. Record errors in harvest or feed data distort farm profit analysis.