I should add there is a extra high rate auger also in which the minimum you can apply is 230lbs. If your not sure what auger you have then follow this procedure to find out.
Remove one delivery tube and tie a bag to the spout under the hopper. Engage the fertilizer drive and drive the planter forward for a distance of roughly 136 feet. Weigh the amount of fertilizer caught in the bag and multiply by 100. The result will be the total pounds per acre.
Casey in SD