GNN130204

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Volume 39, Number 3 | FEBRUARY 4, 2013

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PRACTICAL PRODUCTION TIPS FOR THE PRAIRIE FARMER

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Summer pea inoculant trials Inoculant may build up in the soil over time, but researchers who ran summer trials in Swift Current say that doesn’t mean we shouldn’t keep applying it BY MELANIE EPP

T

his summer, thanks to funding through the Agricultural Demonstration of Practices and Technologies (ADOPT) program, three pea inoculant trials were conducted in Saskatchewan, at Swift Current, Scott, and Melfort. While the Swift Current results are in, the final report has not yet been written up, which means results are preliminary and have not been fully analyzed. Bryan Nybo, manager of Wheatland Conservation Area, was willing to share some of the results, but is careful to note that this is the first year that the demonstration has been conducted and trials were not replicated. For this reason, he is not overly confident in making firm recommendations; however, he did say that some results were consistent with traditional findings for the region.

SWIFT CURRENT TRIALS Besides being un-replicated, the trials had a few other

things working against them last summer, namely weather. Although they had a really good start to the year, an early hailstorm on June 24 created some unexpected damage. “We had higher than average rainfall from April, May and June,” says Nybo. “And then that was followed by July, August and

gen was added instead. In the last trial, peas were grown without inoculant or nitrogen. Of the 13 trials, yields ranged from 31 to 26 bushels per acre. Consistent with expectations, the peas that were not inoculated and grown without nitrogen came in second from the bottom.

“There’s still a need for inoculants on pulses in this area.” — Bryan Nybo, Swift Current

September, which were the driest three consecutive months that have ever been recorded in Swift Current.” Products were demonstrated in 13 separate trials using peat, liquid and granular inoculants by Tag Team, Cell Tech, Pulse Signal II/Optimize and Nodulator. In one trial, no inoculant was used, but nitro-

“So there’s still a need for inoculants on pulses in this area for sure,” says Nybo. “Traditionally, in this area we’ve found the granular inoculant still to be the best. Sometimes the peats are as good as the granular. In other years, they’re just a little below. Again, the long-term traditional results in this area, the liquids — some

years they do good, but other years they don’t tend to do quite as well. They seem to die off a little earlier than some of the other inoculants.”

NITROGEN VS. INOCULANT Interestingly, the peas that received no inoculant, but nitrogen instead, fared quite well. In fact, they came in second on the list. Brad White, an agrologist with South West Terminal at Gull Lake, said they tried nitrogen on its own just to see what it would do. “Actually,” he says, “It was every bit as good as. Between the little bit of inoculant that came out of the soil, and the nitrogen that was provided there, the yield was actually the second best in the whole trial. But 60 pounds of nitrogen is going to cost a guy $35 to $40 an acre, whereas your seedapplied inoculants will be down to $5, and your granular inoculants are $10 to $15, so it’s quite a bit more money.” Nitrogen, he says, is a bit of a

relief as an option, since the use of insecticide reduces the survivability of inoculants. And, unfortunately, with an escalating pea leaf weevil problem, foregoing insecticide really isn’t an option. “If we keep seeing a lot of issues with these pea leaf weevils chewing all the nodules off and reducing the plant’s ability to make nitrogen, and therefore, yield, well, is it going to make more sense to just fertilize these things?” asks White. “I would assume that most guys would not plant them if they get that bad, but if peas are worth $10 or $12 per bushel, you’re going to grow them.”

OVERWINTERING After a number of years, some inoculant will survive over the winter and build up in the soil, affecting the pulse crop in the following year. White is careful to note that this does not mean that farmers can stop using inoculants altogether.

» CONTINUED ON PAGE 4

Brad White explains inoculant trials at a demonstration day at Swift Current. The trials included several types of inoculant, as well as nitrogen on its own. Publications Mail Agreement Number 40069240

In This Issue

PHOTOS: LEEANN MINOGUE

Wheat & Chaff ..................

2

Features ............................

5

Crop Advisor’s Casebook

12

Columns ........................... 16 Machinery & Shop ............ 19 Cattleman’s Corner .......... 25

Better wheat yields

JASON CASSELMAN PAGE 10

Tractor evaluation: 6R SCOTT GARVEY PAGE 20

FarmLife ............................ 29


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