Nitrogen Recommendation Recalibrations for Wheat in North Dakota
A multiple year research study updating N response and recommendations for wheat in various agro-ecological areas of North Dakota.
IPNI-2007-USA-ND15
21 Dec 2007
Methodology
Two sites will be established each year in each of the regions surrounding the Experiment Stations of Fargo, Carrington, Langdon, Minot, Williston and Dickinson. Soil cores will be obtained to a depth of 2 feet at each location. The cores will be divided into 0-6 inch and 6-12 inch and 12-24 inch increments. The 0-6 inch and 6-12 inch cores will be split. One set will be analyzed locally for organic matter, nitrate, P, K and soil pH. The other set will be sent to the ISNT laboratory at the University of Illinois for amino-sugar analysis. The 12-24 inch increment will be analyzed for nitrate. Plots will be established with a series of incremental fertilizer N rates from 0 to about 200 lb N/acre depending the level of residual nitrate found at each site. Spring wheat will be seeded and taken to yield. Yield and protein will be obtained at harvest. The data obtained from these experiments will be combined, and then partitioned by agri-climatology region to determine if regionalization of data is more appropriate than state-wide recommendations. Organic matter levels at each site and the ISNT results will be applied to N response curves to determine whether they help to explain the optimal rates at each site.
Timeline-
April-2008- Soil sampling, treatment application, seeding;
May-July, 2008- Work with cooperators to ensure weed/pest control is adequate in the
plot area;
August-September, 2008- Harvest, protein analysis;
October- November, 2008- Data analysis/sharing of data between stations;
November, 2008- Present results to SBARE and request final year of funding;
April 2009-November 2009- Repeat activities of previous year and write final report,
including discussions regarding N fertilizer recommendation changes and publication of
those new changes.