ISSUE 3 May 24, 2007
There is no adverse effect on corn stand when anhydrous ammonia is knifed in between corn rows at any reasonable rate. Once corn has emerged, most growers wait until the corn is about 5-leaf stage to apply due to the possibility of covering up corn and physically reducing stand by moving around soil clods during the application. If the soil is loose or sandy, the danger of covering up corn may not be a problem and the application can be made earlier. For full yield potential, the side-dress application should be made by 8-leaf. If delayed, potential yield reductions are possible after that date, but are small until about 10-leaf. If delayed further, it is better to get the N on than not to apply it.
Other side-dress options are 28% applied with a shallow knife application, 28% or urea cultivated in (dribbled on between the rows, not broadcast), or if all other options are exhausted, dribbling on liquid N between the rows and allowing rain to move it into the soil. Irrigators, of course, always have the option to apply some 28% through the pivot.
TOP-DRESSING SMALL GRAINS WITH HERBICIDES/FUNGICIDES
Although some herbicide/fungicide labels use small amounts of certain N fertilizers to enhance effectiveness, few include a full-rate top-dressing N amendment with the application of their product. Broadcast foliar application of 28%, the most popular and cost-effective N fertilizer available in the region, results in substantial leaf burn when applied at rates more than a couple gallons/acre. Burning leaves would be expected to reduce the effectiveness of both herbicides or fungicides and may reduce yield due to leaf area losses. Therefore, if top-dress applications of N are required for yield increase, a separate stream-bar application is recommended. There are some products available with low burn potential, particularly slow-release N products. However, so far in our research they have not been any more effective in increasing yield or protein than similar N rates from 28%. Therefore, the cost of using these products may be too high to justify their economically effective use. Research into these products and effective rates is an on-going subject of research at NDSU and other institutions.
ANHYDROUS AMMONIA AND DRY EDIBLE BEANS?
There is no reason why anhydrous ammonia cannot be a source of N for dry edible beans. The preplant application should be made at an angle to the planned direction of planting, just as for any other crop. The application depth should be about 6 inches, or as deep as soil moisture and sealing will allow. The shallower the depth, the more the seed crossing the ammonia band will be affected. This is no different than any other crop. Side-dress application in rowed beans will be similar to corn.
NORTHERN STRIP TILL EXPO
The Northern Strip Till Expo- Tillage for Today & Tomorrow is scheduled for Tuesday, August 14, 2007 at the Jerry Nordick farm, near Rothsay, MN. This event is sponsored by University of Minnesota and North Dakota State University Extension Services. This field day includes field demonstrations of at least 14 different strip-till units that will be working in the field in the AM and PM that day. Also, attendees can hear the latest research updates concerning strip-till, including managing cool soils with high residue, weed management, economics and fertility placement for strip-tillage systems. Speaking presentations will be in the AM and will be repeated in the afternoon. There will be a farmer/user panel at noon. Event will be held rain or shine. Food is available for sale on-site.
For more information, contact Jodi DeJong-Hughes 1-888-241-3261, firstname.lastname@example.org
NDSU Extension Soil Specialist