Crop Production and Seeding Equipment
Crop Production and Seeding Equipment tests whether you can set a drill or air seeder to place seed at the right rate, spacing, and depth, and keep it there. Expect metering systems, calibration procedures, population and rate calculations, opener and depth-control setup, air-seeder fan and distribution, blockage monitoring, downforce, and row-by-row section control.
Metering and calibration
- Volumetric meters (fluted feed, feed cups) deliver seed by volume and must be calibrated for each seed lot. Precision meters (finger pickup, vacuum, brush) singulate seed for accurate spacing.
- Air seeders move seed from a central tank through primary and secondary lines to a distribution head; fan speed must be high enough to prevent plugging without cracking seed.
- Calibrate by catching seed over a measured distance or by the manufacturer's crank-turn method, then weighing the sample. Repeat and average.
- Population is set by seeds per metre of row and row spacing. Seeds per square metre = seeds per metre divided by row spacing in metres.
Placement and depth
- Openers include double disc, single disc, hoe, and shank types; the seed boot places seed and the closing system returns soil contact.
- Depth is controlled by gauge wheels, T-handles, or hydraulic downforce. Too much downforce causes sidewall compaction and smearing; too little causes uneven depth and shallow seed.
- Fertilizer placement options include side band, mid-row band, and seed-placed. Seed-placed safe rates depend on seed bed utilization, soil texture, and moisture.
Worked example
Target population is 320,000 seeds per hectare with 0.25 m row spacing. Seeds per metre of row = 320,000 x 0.25 / 10,000 = 8 seeds per metre. Catching seed from one row over a 20 m pass should therefore yield about 160 seeds. If you count 210 seeds, the meter is running about 30 percent high; recalibrate the meter setting before seeding, because overpopulation costs seed and causes lodging and competition.
Traps that cost marks
- Calibrating once and never rechecking after a seed lot, treatment, or moisture change.
- Confusing germination percentage with field emergence; use realistic establishment for population targets.
- Running the fan too slowly and plugging lines, or too fast and damaging fragile seed.
- Setting depth by the frame rather than by the gauge wheels and actual soil contact.
- Forgetting that blockage sensors and row clutches need calibration after meter or software changes.