Volume 40, Number 5 | FEBRUARY 25, 2014
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PRACTICAL PRODUCTION TIPS FOR THE PRAIRIE FARMER
www.grainews.ca This picture from 2011 shows a spot where nitrogen application triggered iron chlorosis in soybeans (the yellowing plants).
The right amount of nitrogen for soybeans Between hearing of U.S. farmers adding extra nitrogen, and warnings about choosing fields with low nitrogen for soybeans, it’s easy to get confused PHOTO: JOHN HEARD, MAFRD
BY ANGELA LOVELL
S
ome western Canadian farmers new to soybeans are understandably a little confused about the issue of whether or not they need to add nitrogen fertilizer to achieve better yields, especially if they are sourcing production information from the U.S. Differences in soils types, conditions and crop rotations mean that U.S. information isn’t necessarily applicable to
most Canadian Prairie soybean production. While some U.S. farmers are adding nitrogen to soybeans, researchers don’t see benefits to adding nitrogen on the Canadian Prairies. “They may be reading that some U.S. producers are putting nitrogen on their soybeans in the hopes of higher yields,” says John Heard, soil specialist with Manitoba, Agriculture, Food and Rural Development. “Those are for ultra high yields and it’s definitely not a sure thing.”
PRAIRIE TESTING Heard, in association with John Lee of AGVISE Laboratories and Ron Tone of Tone Ag Consulting, recently fertilized demonstration plots in 13 farmers’ fields in North Dakota and Manitoba. “We called them ‘controlled observations’ to assess whether there is any detrimental affect or benefit to nitrogen on soybeans,” says Heard. “We started with a field and caused high nitrogen levels by putting on some fertilizer.
soybeans you should select fields with a low chance of iron chlorosis and that are low in nitrogen,” says Heard. “In fact the two may go hand-in-hand since in addition to impairing nodulation, high soil nitrate tends to worsen iron chlorosis of soybeans.” The study observations showed, however, that it’s important to differentiate between new and established soybean fields. “Having high nitrogen in soil always reduced the
So the objective really wasn’t to fertilize soybeans with nitrogen, it was to study the impact of having soybeans grown in a soil that has high nitrogen.” What’s causing a lot of new soybean growers some distress, says Heard, is the rule of thumb that excessive carryover nitrogen from a previous crop or cropping system may impair the ability of the rhizobium to develop nodules on a subsequent soybean crop. “It’s a common recommendation that as you select candidate fields for
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Wheat & Chaff ..................
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Features ............................
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Columns ........................... 14 Crop Advisor’s Casebook
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Machinery & Shop ............ 23 Cattleman’s Corner .......... 28
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