Vacuum Level for Corn Using A52391 or A52904 Seed Disks

A41081

Use the seed corn supplier's information to calculate the seed size in seeds per pound.

EXAMPLE: If the bag label indicates that there are 115,000 kernels in the bag and bag weight is 45 lbs., the seed size is 2556 seeds per pound (115,000 divided by 45). Referring to the chart, the vacuum level should be set at 10 in. when using the Large Sweet Corn Disk or 7 in. when using the Flat Medium Edible Bean Disk for a seed size of 1889 seeds per pound.

IMPORTANT: The 7 in. or 10 in. vacuum level above is an example on how to use the chart. You must calculate the proper vacuum level for each corn variety.

Most corn seed can be planted near 100 percent of the desired population by simply using one of the seed disks (which have seed cells) listed on the preceding page and adjusting the vacuum level appropriately.

Occasionally, seed spacing can be improved when planting some corn seed which is difficult to singulate

with the cell type seed disks by using a flat seed disk. Difficult seeds to plant include varieties with mixed sizes, mixed shapes, combinations of sizes and shapes, long and slender seeds, seeds with a sharp point (germ) and others. The flat disk has no seed cells and requires the use of a double eliminator and knockout wheel. The double eliminator is used to knock off excess seed while the knockout wheel is used to keep the vacuum holes free of debris.

The Large Sweet Corn Disk and the Medium Edible Bean Disk are two flat seed disks that can be used for improved seed spacing for seed between 1500 and 3200 seeds per pound.

Since the Large Sweet Corn Disk has 40 holes per revolution and the Medium Edible Bean Disk has 50 holes per revolution, different knockout wheel assemblies are required. Use knockout wheel AA37348 for the Large Sweet Corn Disk and knockout wheel AA38844 for the Medium Edible Bean Disk.

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NOTE: Because the Medium Edible Bean Disk singulates more seeds per revolution than the Large Sweet Corn Disk, it operates at a slower RPM, lower vacuum levels can be used. Being able to use a lower vacuum level can make a difference when having to decide whether one or two vacuum blowers are required.

Set the seed transmission according to the population rate charts for the Large Sweet Corn and Flat Edible Bean Disks.

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