equipment. The equipment must be able to provide a uniform flow of seed at the desired rate. Use packer wheels or other suitable packing implement to press soil firmly around the seeds. Drill Calibration Grass or grain drills may be calibrated using the following methods. Bulk weight method: Raise the drill's drive wheel and measure its circumference in feet. Next, measure the distance between seed spouts or disc openers. Use Table A Table A below to determine the number of Row # of Seed Turns revolutions (R) to turn the drive wheel for the row Spacing Spouts to Of spacing and wheel circumference in feet (C) for in Inches Use Drive your drill. Wheel 6 4 96/C=R 7 4 82/C=R 8 3 96/C=R 10 3 77/C=R 12 2 96/C=R 24 1 96/C=R 30 1 77/C=R 36 1 64/C=R 42 1 55/C=R 48 1 48/C=R Place enough seed in the box to cover spouts from which you will collect seed. Turn the drive wheel until all spouts are feeding. Place a container under the correct number of seed spouts (as determined from the table) and turn the drive wheel the number of revolutions previously determined. Weigh the sample in grams. Multiply this weight by 0.5. The result is the pounds per acre at that setting. Make adjustments in the drill setting and continue trials until the desired seeding rate is obtained. Remember: Seeding rates as determined by this method are in terms of bulk seed. You need to convert your seeding rate from pure live seed per acre to bulk seed per acre when using this calibration method. Example: Row spacing = 7 inches
equipment. The equipment must be able to provide a uniform flow of seed at the desired rate. Use packer wheels or other suitable packing implement to press soil firmly around the seeds. Drill Calibration Grass or grain drills may be calibrated using the following methods. Bulk weight method: Raise the drill's drive wheel and measure its circumference in feet. Next, measure the distance between seed spouts or disc openers. Use Table A below to determine the number of revolutions (R) to turn the drive wheel for the row spacing and wheel circumference in feet (C) for your drill. Table A Row Spacing in Inches # of Seed Spouts to Use Turns Of Drive Wheel 6 4 96/C=R 7 4 82/C=R 8 3 96/C=R 10 3 77/C=R 12 2 96/C=R 24 1 96/C=R 30 1 77/C=R 36 1 64/C=R 42 1 55/C=R 48 1 48/C=R Place enough seed in the box to cover spouts from which you will collect seed. Turn the drive wheel until all spouts are feeding. Place a container under the correct number of seed spouts (as determined from the table) and turn the drive wheel the number of revolutions previously determined. Weigh the sample in grams. Multiply this weight by 0.5. The result is the pounds per acre at that setting. Make adjustments in the drill setting and continue trials until the desired seeding rate is obtained. Remember: Seeding rates as determined by this method are in terms of bulk seed. You need to convert your seeding rate from pure live seed per acre to bulk seed per acre when using this calibration method. Example: Row spacing = 7 inches
512_Technical_Note_1_revised4_with_seed_tool_link.docx