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Corn+Soybean Digest

New technology detects in-season nutrient deficiencies earlier than tissue tests

Farm manager Jim Goss holds a plastic jar containing a special ionexchange resin mixed with soil and water which can detect deficiencies of more than a dozen nutrients before plants show symptoms
Farm manager Jim Goss holds a plastic jar containing a special ionexchange resin mixed with soil and water, which can detect deficiencies of more than a dozen nutrients before plants show symptoms.
Think Different “With resin nutrient testing technology, in conjunction with the soil and tissue tests, we have an opportunity to apply foliar products in-season to turn the crop around or top it off. One approach would be to use the resin test a week or two before applying postemergence herbicides or fungicides. If the test showed deficiencies, you could make an application when you were making a trip across the field anyway.” – Larry Tracy, Precision Agronomics, West Lebanon, IN 

Jim Goss isn’t ready to declare tissue tests obsolete. But if field trials of a new resin-based technology continue to pan out, he thinks he may have found a new early warning system to detect unexpected nutrient deficiencies early enough to prevent yield losses.

“Currently, we follow up on symptoms of nutrient deficiencies with a tissue test,” says Goss, who oversees management of farms in east-central Illinois for AG Farm Management, Urbana. “We can stop further yield declines with a rescue treatment, but we are generally too late to eliminate losses.”



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The new resin technology can detect soil nutrients available to the crop. The goal is to identify deficiencies before symptoms occur, and early enough for nutrient applications that could boost yield.

“This has the potential to be far more effective than tissue testing,” says Goss, who has used the resin technology on a dozen farms over the past three years. “It may not be as good as the invention of soil testing 100 years ago, but I have seen enough to be excited.”


Technology basics

The resin technology, developed by Unibest International, has been used for more than a decade for environmental monitoring. In agricultural applications now coming to market, the ion-exchange resin adsorbs nutrients only in forms available for plant uptake. To test a field’s nutrient availability status, the resin capsule – about the size of a cherry tomato – is mixed with a small amount of soil and distilled water in a jar, then analyzed by a laboratory five days later.

Unibest recently announced that WinField, the Land O’Lakes agronomy company, will be the technology’s exclusive distributor in the U.S. agriculture market. The resin capsules – sold under WinField’s Nutrivision Resin Capsule Technology and Unibest’s Ag Manager brands – will be available through participating WinField retailers and other providers beginning in 2014, according to Josh Krenz, WinField director of plant nutrition.

The capsules can detect more than a dozen nutrients, including nitrate and ammonium nitrogen, phosphorus, potassium, boron, iron, manganese and zinc. WinField, which has tested the resin technology for over three years, will provide potassium results in 2014. More nutrients will follow in 2015 after additional calibration research.

 “Of the 180,000 tissue samples we have taken on various crops over the past five years, potassium is one of the leading deficient nutrients,” Krenz says. “We see a great need for expanding knowledge about potassium deficiencies.”

The list price for an Ag Manager test kit is $50. Pricing for Nutrivision is available from Winfield dealers. For information, visit or

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