Japan · Institution of Professional Engineers, Japan (IPEJ) · licensing
Written (not multiple choice): compulsory paper 2 h (40 marks), elective papers 3.5 h (30 + 30 marks), then a 20-minute oral. 4–7 years' experience required.
Options revised from 2019. There is no stand-alone farm-machinery option: Japan examines agricultural engineering as rural and irrigation civil engineering. Past papers are free to read but not openly licensed.
Official source: https://www.engineer.or.jp/c_topics/011/011422.html
Original questions written to this exam's published syllabus and pattern. Not past papers.
1. A herbicide applied after sowing but before the crop and weeds emerge is described as:
C. Pre-emergence
Pre-emergence herbicides are applied to the soil surface after sowing and before emergence. Post-emergence products go on emerged weeds; pre-plant incorporated products are mixed into soil before sowing; a directed spray is a post-emergence spray aimed below the crop canopy.
Crop Production & Protection for Engineers · Weed management
2. The head reaches of a canal command suffer waterlogging while tail-end farmers are short of water. Which strategy addresses both problems together?
B. Conjunctive use: pumping groundwater in the head reaches while limiting canal allocations there, and routing more canal water to the tail
Pumping lowers water tables in the waterlogged head, and freeing canal water for the tail improves equity. More water to the head worsens both problems; lining at the tail helps the tail only; rice at the tail increases demand where water is scarce.
Irrigation Engineering (Soil-Water-Plant, Conveyance, Surface Methods) · Command area development
3. A farmer irrigates a prepared field, lets the first flush of weeds emerge, kills them with a shallow pass or a non-selective herbicide, and then sows. This practice is called:
C. A stale seedbed
The stale seedbed technique depletes the surface weed seed bank before sowing. Solarisation heats moist soil under clear plastic; smother cropping uses a competitive crop to suppress weeds; allelopathic mulching relies on chemicals released by residue.
Crop Production & Protection for Engineers · Weed management
4. An insecticide label gives a dose of 1.0 kg a.i./ha. The product is a 50 % wettable powder. How much product is needed per hectare?
C. 2.0 kg
Product = a.i. dose ÷ fraction a.i. = 1.0 ÷ 0.50 = 2.0 kg. 0.5 kg multiplies by 0.5; 1.0 kg ignores the formulation; 50 kg treats the percentage as a multiplier.
Crop Production & Protection for Engineers · Pest and disease management and application rates
5. A sprayer calibrated at 6 km/h delivers 150 L/ha. The operator drives at 8 km/h without changing nozzles or pressure. What is the actual application rate, and what happens to the dose of a.i. if the tank mix was made for 150 L/ha?
D. 112.5 L/ha, and the a.i. dose falls by 25 %
Rate ∝ 1/speed at constant flow: 150 × 6 ÷ 8 = 112.5 L/ha. The tank concentration is fixed, so a.i. per hectare also falls to 75 % of target. 200 L/ha inverts the speed ratio; a fixed-pressure sprayer without rate control does not compensate; and with a fixed concentration, a.i. dose falls in step with volume.
Crop Production & Protection for Engineers · Pest and disease management and application rates
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