Note that there may have been changes to the openers that were tested. Refer to Alberta Farm Machinery Research Centre Evaluation Report 721 for more information. Packing is very important. Ensure that the entire seedrow is being packed. The precise shape and material that your packer is made of and packing pressure will vary with soil and environmental conditions.
Check openers regularly for wear.
As openers wear, their configuration changes. This wear may result in a shallower placement of fertilizer, thus nearer the seed. It may result in the loss of the shelf that the seed is placed on so as not to fall into the fertilizer trench or it may result in a change of the angle of attack of the opener and flatten out the opener. Check behind wheels for wear first. A good idea is to carry a new opener or point to compare wear with those currently being used.