GNN130225

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Volume 39, Number 5 | FEBRUARY 25, 2013

$4.25

PRACTICAL PRODUCTION TIPS FOR THE PRAIRIE FARMER

www.grainews.ca

Double up soybean inoculants Soybeans need rhizobia. Double application of inoculant is a common way to kick-start soil with a short history of soybeans BY ANGELA LOVELL

dealer, but they will also use a granular inoculant in-furrow as well. That’s because in a newer soybean production area we need to build up inoculum in the soil and we often experience tough planting conditions that can be very hard on rhizobia survival.”

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f farmers want to achieve maximum yields in soybean crops, especially in areas where soybeans have not traditionally been grown, double inoculation with live nitrogen fixing bacteria, rhizobia, is vital. Even in areas where pulses have been in production for many years, it can take a long time for rhizobia to build up in the soil. The rhizobia associated with soybeans is not native to the Prairies, so rhizobia must be continually applied at seeding. Because of this, and the fact that soybeans haven’t been seeded regularly for 30 or 40 years in most areas in Western Canada as they have in places like Iowa or Ontario, a good way to make sure there is sufficient rhizobia in the soil is to double-apply inoculants. “For new soybean growers in Western Canada double inoculation is quite common, which is very different to pea and lentil growers,” says Danielle Fletcher, an agronomist with Becker Underwood. “Soybean growers will pick up their seed that is already inoculated from the

TYPES OF INOCULANT Each pulse crop requires a specific species of rhizobia, so it’s important for farmers to make sure they inoculate soybeans with soybean rhizobia. There are three different formulations of inoculant: peat based, liquid and granular. Peat and liquid based formulations are commonly seedapplied; granular is applied infurrow. The choice about which formulation(s) to use comes down to convenience, application costs and equipment capabilities. Liquid inoculants offer a longer planting window. The length varies depending on the product, but can be as long as 60 days. Many soybean growers have their seed pre-inoculated by the retailer with a liquid inoculant, plus an extender that extends the on-seed » CONTINUED ON PAGE 4

PHOTO: BECKER UNDERWOOD

This soybean plant nodule has been sliced open. The pink area demonstrates that the plant is actively fixing nitrogen.

In This Issue

Publications Mail Agreement Number 40069240

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

2

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

5

Crop Advisor’s Casebook

12

Columns ........................... 21 Machinery & Shop ............ 30 Cattleman’s Corner .......... 36

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