How to calibrate and accept seed drill metering accuracy for procurement?
• Choose mechanical meter for large seeds, pneumatic for small at speed.
• Seed spacing coefficient of variation ≤15% accepted.
• Bench test row-to-row discharge consistency; deviation ≤5%.
• Match ground wheel ratio to seeding rate, recheck after calibration.
• Keep seed-fertilizer separation ≥5 cm to prevent burn.
• Seed spacing coefficient of variation ≤15% accepted.
• Bench test row-to-row discharge consistency; deviation ≤5%.
• Match ground wheel ratio to seeding rate, recheck after calibration.
• Keep seed-fertilizer separation ≥5 cm to prevent burn.