Yield increased as separation increased with the mobile nutrients of nitrogen and sulphur. This confirms the plants preference to have adequate separation from these nutrients. It also confirms the ability of the plant to safely access these nutrients in a time frame where uptake will optimize yield while avoiding the negative impacts of closer fertilizer placement strategies.
The Seeding Process
Once you fill the seeder with the optimum seed variety and appropriate fertilizer based on soil requirements, you have the next most significant opportunity to impact yield–getting each seed and unit of fertility into the optimum position in the soil, with the optimum level of soil density surrounding it.
–The quality of the seeding job is critical. Studies have shown that canola emergence is superior when placed on a well-defined seed bed. It is therefore important to choose an opener that does not sacrifice the quality of the seedbed. Get out of the tractor often and check for problems such as soil fracturing, windrowing (stepping), or uneven seed placement.
–It is important to match the opener style with the packer wheel. A narrow ¾" knife typically is paired with a narrow wheel to focus packing over the narrow furrow. Likewise, a wider packer is needed for openers providing greater seed bed utilization.
–Openers that do a good job of preserving the seedbed also allow you to operate at higher speeds without sacrificing placement. Keep in mind that all openers have an operational speed limit for the given conditions and you must stay within that limit to achieve even germination, emergence and maturity.
–Setting the correct packing force for the given conditions is crucial for optimal germination. Excessive packing can cause compaction and sealing in wet soils, particularly wet heavy textured soils. Too light packing may not seal in enough moisture in dry conditions.
–Take time to set your seed depth for optimal emergence. Farmers who adjust their seed depth to best match the soil moisture and weather conditions have commented how emergence and maturity improved in the field after the change was made.
Taken from the Winter 2012 / Spring 2013 Cutting Edge magazine. Full copy available for download from index.