Gnn131202

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Volume 39, Number 18 | DECEMBER 2, 2013

$4.25

PRACTICAL PRODUCTION TIPS FOR THE PRAIRIE FARMER

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Get the most from pulses with proper inoculation Good inoculation is the key to high pulse yields. Choose the right formulation for your farm BY SARAH WEIGUM

M

uch of what farmers do is an attempt to overcome the challenges of nature — from fighting disease and weeds to protecting livestock from inclement weather. Inoculating pulse crops gives growers the opportunity to work with the natural properties of living organisms for payoff, both economically and environmentally. Peas, lentils, soybeans and other pulses can produce a profitable crop with little or no nitrogen fertilizer as long as their roots are able to form a symbiotic relationship with rhizobia bacteria. Native rhizobia can be found in every soil, but putting the right strain of bacteria on or near the seed when it goes into the ground ensures that the plant can undergo the nitrogen fixing process. While there is little debate among scientists and farmers of the value of inoculating pulses with bacteria, there are still some decisions to make and best management practices to remember.

INOCULANT FORMULATION Choosing an inoculant formulation is still the biggest decision growers have to make. John Treloar, technical agronomist for Novozymes, explained some of the pros and cons of liquid, self-stick peat and granular formulations. 1. Liquid inoculant: Liquid forms of inoculant, Treloar said, are an excellent way to have the bacteria as close as possible to the seedling when the first roots are poking out of the seed. “If it’s applied correctly you know it’s right on the seed,” said Treloar. Using liquid does, however, mean an extra step before getting in the field as farmers have to apply the inoculant as the seed is going into the truck or drill. Some kind of metered liquid applicator

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should be used to ensure proper bacteria levels are achieved on the seed. These applicators can cost anywhere from less than $500 to into the thousands. When using these kind of treaters it’s important to calibrate them each year or if the weather changes significantly. Liquid is the most “unstable” of the inoculant formulations, meaning that the bacteria is most vulnerable in this form. Some liquid inoculants are only safe on bare seed for six hours before planting. Very few liquid inoculants are compatible with seed treatments, seed primers or colorants. 2. Peat-based inoculant formulations: Peat-based formulations are applied directly to the seed as well, but they offer a more stable form of the inoculant than liquid. Treloar explained that the peat protects the bacteria. “The peat gives the bug an environment it can survive in without getting brushed off easily.” Peat inoculants have a self-sticking agent so they will stick to the seed as it is metered on. However, peats can also be mixed with water to form a slurry. Because the bacteria is protected, peat-based inoculants can survive on the seed longer than liquid, but in most cases the peat-inoculated seed still needs to be put in the ground within a matter of days. 3. Granular inoculants: Granular inoculants are not applied to the seed, but into the soil from a tank on the air cart. This is the most stable form of inoculant. As David Townsend, BASF brand manager, explained, the granules form a protective defence around the bacteria. “That’s why the granular can work so well. It’s in its own little house and it can’t get hurt by seed treatment.” There are no compatibility issues between granular inoculant and seed treatments because they do not come into direct contact.

Granular inoculant tends to be more expensive than liquid or peat-based options, but adds convenience as producers can simply empty a bag of inoculant into the third tank on the cart at seeding time rather than have to apply the seed treatment to the seed. The metering system on the granular tank should be calibrated in the field just like farmers would do with seed or fertilizer tanks.

COMPATIBILITY The company representatives interviewed for this story stressed the importance of checking their websites for compatibility between the inoculant and any other product applied to the seed, including treatments, fertilizers and colourants. Formulations of crop protection products change frequently and inoculant manufacturers do new compatibility tests every year, so it is important to have the current crop year’s information in front of you when making a decision about which inoculant to use.

HANDLING The proper handling of inoculant varies by product, but some general principles apply to all inoculants. “We are talking about a live organism,” said Treloar. “You can’t leave it in your chemical shed over winter. You can’t leave the liquid in your truck for a couple of days when it’s over 25 degrees.” Liquid products should not be allowed to freeze and all products should be stored below 15 degrees Celsius and out of direct heat. Granular inoculant bags should be stored on a pallet off of the floor of the shop or warehouse. Liquid inoculants come in small blad-

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PHOTO: BASF

By taking time to survey fields while plants are nodulating, farmers can see how well their pulse crops are fixing nitrogen.

In This Issue

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

2

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

5

Crop Advisor’s Casebook

6

Columns ........................... 22 Machinery & Shop ............ 28 Cattleman’s Corner .......... 37

New camelina variety

LISA GUENTHER PAGE 14

Class 8 Gleaner Combine

SCOTT GARVEY PAGE 34

FarmLife ............................ 44


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