Agricultural Engineering and Farm Machinery
Agricultural Engineering and Farm Machinery
This domain tests tillage implements, seeding and spraying machinery, irrigation efficiency, power transmission and farm safety. Numerical items often involve calibration, area covered or water discharge.
Core rules
- Primary tillage breaks and inverts soil, using mouldboard plough, disc plough or chisel plough. Secondary tillage refines the seedbed, using harrow, cultivator or roller.
- Seed drill calibration matches seed drop to a target kg/ha. Effective width, forward speed, row spacing and overlap affect the actual rate.
- Irrigation efficiency = water stored in the root zone / water delivered. Drip and sprinkler systems can raise application efficiency compared with uncontrolled flooding.
- Tractor power reaches implements through drawbar, PTO or hydraulic systems. PTO-driven implements require correct rpm and shaft guarding.
Worked example
A seed drill has 20 cm row spacing and a target seed rate of 100 kg/ha. Area covered by one row-metre = 0.20 m x 1 m = 0.20 m2. Seed per row-metre = 100 kg/10,000 m2 x 0.20 m2 = 0.002 kg = 2 g. If the drill has 15 rows, it should drop 15 x 2 = 30 g per forward metre. The reasoning converts the hectare rate to the small area represented by one metre of one row.
Traps
Do not mix km/h with m/s without converting. Use effective working width, not total machine width, when overlap occurs. Higher pump discharge does not guarantee higher field application efficiency. Check seed and fertilizer calibration separately. Keep PTO guards in place.