ISSUE #422

422 - Proper Weed Control Pays Huge Dividends

6-25-02

Achieving optimum weed control is the single greatest challenge facing sugarbeet producers. Weed control efforts cost $15 million dollars or more for American Crystal Sugar Company shareholders each year. Learn how to maximize return for each dollar spent controlling weeds. Attend the NDSU/ U of MN weed research tours scheduled in June and July. Find out how Dr. Dexter gets nearly 100% control of even tough to control weeds like Common Lambsquarters and others.

Summer 2002 Sugarbeet Plot Tour Schedule

June 27 9:00 a.m. Glasston and St. Thomas - Start at Glasston site at 9:00 a.m., 6.5 miles east of Glasston on north side of road. After Glasston, move to St. Thomas site. Sugarbeet root maggot and sugarbeet weeds from junction of Highway 81 & 66, go west about 3 miles on 66. Plots on north side of road.
July 2 8:30 a.m.
10:30 a.m.
Fargo - NDSU General Weed Control Research. 8:30-10:00 - Prosper Research Site, north & west of Prosper adjoining railroad tracks. Casselton Seed Farm - 10:30-12:00. Casselton exit and west on frontage road.
July 8 6:00 p.m. Christine - Weeds in sugarbeet, beans, and small grain varieties. Christine exit on I-29. Go west for about 0.5 mile; turn right on first gravel road going north for 0.75 miles. South of farmstead to bend in road.
July 9 9:30 a.m. Hillsboro - Weeds in sugarbeet. Take Highway 200 (Exit 100) east from I-29 for 2 miles, north 0.5 mile, plots on east side of road.
July 10 1:15 & 3:00 p.m. Crookston - Univ. Of MN. NW Research & Outreach Center tour. Just north of Crookston along Highway 75. Sugarbeet weed tour.
July 16 9:00 a.m. Fargo - SBREB Annual Summer Plot Tour. Contact Mohamed Khan - 701-231-8596

Replants/Poor Stands Create Outlook® Opportunity:

The adverse weather conditions experienced this spring have reduced expected plant populations by 10, 20, 30, 40 percent and even more. The last Ag Notes had extensive details on how to use Layby Outlook most effectively this year. Apply Outlook when beets are in the mid 4-leaf stage to minimize any risk of crop injury Figure 1.

422

Layby Outlook should minimize late season weed competition in the beet crop. Contact your agriculturist or university specialists for assistance with Outlook timing, use rate, band or broadcast considerations, or other questions.

Nitrogen Status of Soil Covered With Water: Areas of fields in the eastern 50 miles of North Dakota and western Minnesota which have been covered with water due to heavy rains are in danger not only of crop damage or loss, but loss of nitrogen fertilizer due to denitrification. Denitrification is a bacteria mediated process which occurs during low oxygen conditions such as flooding. In warm soils, as we now have, losses of 50% in 24 hours is possible. The nitrogen must be nitrate for the denitrification conversion of nitrate to nitrogen gases to occur. Nitrogen applied last fall is most at risk, but any nitrogen which was applied earlier than two weeks before the rains is largely at risk as well, since a large portion of that later applied ammonium fertilizer has also been converted to nitrate between application and the rain.

If crops survive being covered with water, they will appear yellow for a time simply because of the stress being flooded causes. However, if the crops do not restore their green color in about 10 days, supplemental nitrogen may be needed to help make a decent crop. Tissue tests or soil samples can confirm N status. Nitrogen deficiency symptoms will appear first on lower leaves. Newer leaves will be more green.

Dr. Dave Franzen, NDSU Extension Soil Science Specialist

Editors Note:

In flooded or very wet sugarbeet fields, yield potential has been reduced so no additional nitrogen may be needed. Always soil test the field before applying more nitrogen. Never apply additional nitrogen after late June without Definite Documentation that its needed.

July 2002 Shareholder Shop Meetings

Get the most current information on developments at American Crystal by attending one of the shop meetings in your district. Details for meeting times and places and directions are posted on American Crystal’s Internet site and DTN pages. Multiple meetings are scheduled for July 8, 11, 12 and 16.