MicroAZ-ST Dry™ Seed Treatment for Corn

MicroAZ-ST Dry™ is a microbial inoculant seed treatment for corn, designed to jumpstart early-season growth and enhance overall crop performance. MicroAZ-ST Dry features Azospirillum, a beneficial bacteria known for its dual-action benefits.

Key Benefits:

Biological Nitrogen Fixation – Azospirillum captures atmospheric nitrogen and converts it into a plant available form.
Enhanced Root Development – Produces natural growth- promoting compounds that stimulate root growth, improving early vigor and plant stability.
Improved Nutrient Uptake – Stronger root systems lead to more efficient uptake of water and key nutrients.
Increased Yields – This powerful combination helps maximize plant health and yield performance.

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MicroAZ-ST Dry is a TerraMax biological seed treatment for corn. Its active organism, Azospirillum brasilense, fixes nitrogen from the air and converts it into ammonium, a form corn plants can use, providing supplemental nitrogen. It's applied at 2 oz. per 80,000 kernels and mixed thoroughly in the planter box.

MicroAZ-ST Dry corn yield results

Yields in bushels per acre (bu/ac), MicroAZ-ST Dry vs. the untreated check (UTC)

Multi-year trial summary, 2006–2022

2006–2008 UNL, Nebraska
+5.4
65.9 → 71.3
2013–2016 Yuma, CO
+9.4
194.6 → 204.0
2018 Yuma, CO
+8.0
229.0 → 237.0
2018 TSI: IA, WI, IN, OH
+9.5
208.4 → 217.9
2018 Prairie Seeds, IN
+3.8
215.6 → 219.4
2019 TSI: IA, WI, IN, OH
+7.4
210.4 → 217.8
2021 Kansas
+10.5
210.8 → 221.3
2022 Minnesota
+12.4
243.1 → 255.5

Bars show yield advantage over the untreated check. Right column: untreated check → MicroAZ-ST Dry.

+8.3bu/ac average across the eight trials.

Recent trials, 2024–2025

MicroAZ-ST Dry out-yielded the untreated check at 10 of 11 sites. The one exception was Clinton, MN (−4.0 bu/ac).

Nebraska, 2024 avg. +13.0 bu/acOhio, 2024 avg. +17.2 bu/acMinnesota, 2025 avg. +7.9 bu/acIllinois, 2025 +3.6 bu/ac

Aurora, NE2024

261.8

272.3

+10.5 bu/ac

Central City, NE2024

213.4

229.0

+15.6 bu/ac

Delphos, OH2024

224.9

244.9

+20.0 bu/ac

Greenville, OH2024

252.3

266.7

+14.4 bu/ac

Brooten, MN2025

203.7

221.1

+17.4 bu/ac

Clinton, MN2025

210.1

206.1

−4.0 bu/ac

Glencoe, MN2025

203.3

204.9

+1.6 bu/ac

Kerkhoven, MN2025

153.7

170.3

+16.6 bu/ac

Macomb, IL2025

278.6

282.2

+3.6 bu/ac

UTC (untreated) MicroAZ-ST Dry

In the field

Corn root systems treated with MicroAZ-ST Dry compared with the untreated check (UTC) on a pickup tailgate in Nebraska. — Root systems, MicroAZ-ST Dry vs. untreated check (UTC). Nebraska.

Young corn plants with roots, MicroAZ-ST Dry compared with the untreated check (UTC), laid on a pickup tailgate in Kansas. — Corn plants and roots, MicroAZ-ST Dry vs. untreated check (UTC). Kansas.

Corn root systems from the untreated check (UTC) and MicroAZ-ST Dry side by side, Graymont, Illinois. — Root systems, untreated check (UTC) vs. MicroAZ-ST Dry. Graymont, Illinois.

Corn ears from the untreated check and from MicroAZ-ST Dry-treated corn, shown side by side. — Ears from the untreated check and MicroAZ-ST Dry.

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