NewLeaf Symbiotics 2020 Yield Results


NewLeaf Symbiotics
Proven Increased Yield Results

Since its inception, NewLeaf Symbiotics has partnered with a variety of contract research organizations, IN10T® FarmerTrials® and worked directly with growers across the country to develop ag biologicals that increase plant nutrient uptake, and improve abiotic stress tolerance for corn and soy and pipeline products to solve the billion dollar corn rootworm problem.*

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*Pending EPA approval

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2021 Beck's Hybrids Practical Farm Research Trial Results

Terrasym 401 for Soybeans

+2.7 Bu/A advantage 
$17.64 net return per acre

Terrasym 450 for Corn

+4.6 Bu/A advantage
$17.64 net return per acre

2020 IN10T FarmerTrials® Results

Terrasym 401 for Soybeans

75% win-rate
+2.0 Bu/A advantage across all IN10T Farmer Trials
+2.5% Stand
+9.6% Total root area
+5.7% Skeleton rooting depth
+5.7% Skeleton rooting width


Terrasym 409 for Soybeans

76% win-rate
+2.0 Bu/A advantage across all IN10T Farmer Trials
+12.4% Total root area
+10.3% Rooting depth
+7.8% Root tips
+20.7% Leaf tissue iron concentrations (ppm)


Terrasym 450 for Corn

80% win-rate
+7.3 Bu/A advantage across all IN10T Farmer Trials
+1.7% Stand
+6.2% Total root area
+9% Average nodal root length
+5.2% Skeleton rooting depth
+2.4% Skeleton rooting width
+14.6% Leaf tissue iron concentrations (ppm)
+10.6% Leaf tissue manganese concentrations (ppm)

Click on the interactive map below to view yield results for our biostimulants and bio control.

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Dave Weaver


Based in Lincoln, IL serving the Illinois, Wisconsin and Michigan

Don Matthes


Based in Carmel, IN serving areas east of the Mississippi

Rollie Knudson


Based in Mason City, IA serving Iowa, Nebraska and the Dakotas

NewLeaf Symbiotics Product Overview





TERRASYM 401: Biostimulant

NL 13: Biostimulant


TERRASYM 450: Biostimulant

TERRASYM 201: Biocontrol for the Mitigation of Corn Rootworm

TERRASYM 408: Biostimulant

TERRASYM 801: Biostimulant + Biocontrol for the Mitigation of Corn Rootworm (50% rate)

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2020 Yield Success Stories


Terrasym 408

When I examined the treated and untreated roots, I noticed a lot of finer hairs on the plant that was treated. Around August, I called another farmer and said, ‘Hey, I've never seen soybeans filled to the top like this -  just this stack full of pods.’ We went in the field, circled out a  30-acre spot, and could see a five to six bushel yield advantage on the Terrasym treated soybeans.

Tom Feldman;
Slater, IA


Terrasym 450

My farm is poorly drained and has wet soil, so we chose to use Terrasym 450 to help improve our yields. We've collected the last five years worth of yield data. After using Terrasym, we beat it by 10 bushels. But we did make one mistake: We didn't do the whole thing. We should've used both sides of the planter.

Steve Johnson;
Ames, IA


Terrasym 401

When I think of Terrasym, I think of all the science behind it. Everything at NewLeaf Symbiotics is PhD-driven. They’re actually creating a product and constantly working to better it.

Matt Storby;
Lake Mills, IA

* Source: 2020 IN10T FarmerTrials® data. Performance may vary from location to location and from year to year as local soil, climate, and/or other conditions change. Always read and follow label directions. Check state registration to make sure product is registered in your state. NewLeaf Symbiotics® and Terrasym® are both registered trademarks.