Crop & Pest Report

Accessibility


| Share

A Look Back at Side-Dress (08/13/15)

It is satisfying to see side-dress become more common in ND on soils with a high susceptibility to in-season N loss from leaching or denitrification. As plans are made this winter on strategies for next season, please consider the following:

A Look Back at Side-Dress

It is satisfying to see side-dress become more common in ND on soils with a high susceptibility to in-season N loss from leaching or denitrification. As plans are made this winter on strategies for next season, please consider the following:

                -  Apply about half the needed N for corn based on the higher productivity corn N calculator rate at preplant.

                - If the season is relatively dry, the other half can be applied at sidedress starting about V5 based on the ND Corn N Calculator for the higher productivity soil in your tillage/soil textural category.

                - If the fall season freeze-up is late and/or early season is wet, then a decision has to be made regarding early season losses.

My best recommendation is to establish an N-rich strip in the field on the major soil category defined in our NDSU corn active-optical sensor algorithm circular, or two strips if there are two major soil categories represented in the field or two varieties (don’t split a planter with multiple varieties when you plan to do this). If the grower has the proper algorithms loaded into the computer/controller, on-the-go N based on yield potential of the N-nonlimiting portion of the field can be conducted using an active-optical sensor, which is a much more scientific approach than a guess.

                -  I witnessed a Soil Scan operation this summer and was dismayed that we were again fighting the soil sampling approach to side dress. The soil sampling approach is most restrictive and impractical for side-dress because to get a decent representation of the N needs of the field, multiple cores have to be taken at a critical time in the early summer immediately prior to application (V9 as recommended by the company is way too late for ND- has to start before V8 and end about V8). Will anyone take the number of samples needed to make this scientific? I don’t think so. Unless I misinterpreted what was happening at the farm I visited, two soil cores were taken to represent two different areas, a rate was determined and away they went. I like zone sampling for preplant N; I helped develop it as a standard preplant practice, but for side-dress I can’t imagine it would be practical and there is 0 data relating soil sampling and sidedress in this state.

                - In coulter UAN application, apply shallow when wet and deep when dry. I don’t think many growers are trying to reach moisture in dry soils as they should.

Dave Franzen

NDSU Extension Soil Specialist


Creative Commons License
Feel free to use and share this content, but please do so under the conditions of our Creative Commons license and our Rules for Use. Thanks.