All posts by Ryan Blair, County Variety Trial Coordinator

County Standardized Trials Corn Data

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Yield data from our County Standardized Corn Trials are in.  With extended drought and heat, much of our corn was stressed and decreased yields were common. While we did experienced areas of low yields, having a high number of locations serving as replications allows for a high confidence level statistically.

These CST plots are large strip trials located ‘on-farm’ with a minimum of 300 feet in length.  Inputs and management decisions are on a by location basis and determined by the cooperating producers.  Three relative maturity groups divide the trials, Early Corn will be 113 day and earlier, Medium Corn will be 114-116 day, and Full Corn is 117 day plus.

Below are the results for our 3 RM groups.  Click on the table to open a PDF of these tables.  These results can also be accessed on

Thank you to everyone involved in making this program happen.  It wouldn’t be possible without all the County Agents, Cooperating Producers, Seed Industry Representatives, and others involved.

2022 County Standardized Trials-Wheat Data

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This year’s County Standardized Trials (CST) Wheat data are in.  In fall of 2021, we had 7 successful wheat variety test plots planted, with 13 varieties coming from 5 industry leading seed providers.  Summer 2022 harvest resulted in: locations averaged from 38 bu/ac to 120 bu/ac with an overall average across locations and varieties of 88.4 bu/ac.  A full report including OVT data is available at

click on table to enlarge

The CST program utilizes County Agents and local producers to evaluate variety performance in on-farm, large strip trials.  Each trial is a minimum length of 300 feet and trials are managed using the producers’ chosen practices in accordance with UT recommendations.  A special thanks to all Agents and producers involved, along with our seed industry partners!!

For more information on UT’s variety testing programs, please contact your County Extension Office.


Thoughts on irrigating corn and soybean during 2022

As many of you know, Dr. Angela McClure, our Extension Corn and Soybean Specialist, retired at the end of June after 20 years of service.  Dr. McClure will be greatly missed.  We are actively searching for a replacement and hope to have the position filled quickly.  In the meantime, my colleagues and I will do our best to cover these commodities until the position is filled.

Rainfall (or lack thereof) has been the main topic of conversation in double crop soybean, full season soybean and corn.  Several specific questions have arisen lately on irrigation management and how to maximize returns during 2022.  With help from several of my colleagues, I’ve worked to update a previous post of Dr. McClure’s with information from 2022. Continue reading

Management Practices to Optimize Nitrogen Fertilizer Use with High Fertilizer Prices

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Nitrogen (N) fertilizers may be a limiting factor for corn production based on rising N fertilizer prices and other production input. There are a few things to consider with high N fertilizer prices: (a) apply N fertilizer at the right time, (2) add or treat urea-based fertilizers with a proven N stabilizer, and (3) apply the N fertilizer at the appropriate N rate.

Apply N fertilizer at the right time

Preplant N application in corn is not recommended in Tennessee because of the length of time from application to when the corn plant will begin significant N uptake. One exception is the application of anhydrous ammonia with properly calibrated equipment. Corn plants take up little N (<12% of N uptake during the growing season) until V6 growth stage, with the most active period of N uptake occurring between V8 to V14. Hence, there is a greater risk for N loss via ammonia volatilization or nitrate leaching from preplant N. Split application is recommended when N rates are greater than 120 lb N/A. A typical split management practice is to apply a third of the total intended N per acre at planting and sidedress the remaining N fertilizer between V4 to V6. Split application also provides flexibility to adjusting N rate during growing season as compared to just a single application at planting. Split-application of a third of the recommended N at planting and sidedress the remaining N fertilizer provides greater yield than single application at planting (Figure Below-average across six trials). Continue reading

2021 TN Cotton Variety Trial Results now available online

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The 2021 Tennessee Cotton Variety Trial Results Publication (PB 1742) is now available online.  Included within these results are ten large strip trials (CSTs) testing 15 XtendFlex commercial varieties, three large strip trials (CSTs) testing 5 Enlist commercial varieties, and six small plot trials (OVTs) testing 41 experimental and commercial varieties. Special thanks to all of the agents and producers who helped generate this data.  Additionally, thanks to the USDA Classing Office in Memphis for assisting with this effort.  If you have any questions on location response or variety placement, please do not hesitate to reach out directly to your county agent.

Preliminary 2021 Cotton CST Data

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Preliminary data from the 2021 TN Cotton CSTs is now available.  We are releasing an average table for the XtendFlex trials and the Enlist trials today and hope to release the quality and individual location results in the near future.  Keep in mind the XtendFlex and Enlist trials are conducted separately, so direct comparisons between tables cannot be made from this dataset.  Also, stay tuned for the OVT small plot trial data average table which includes 41 commercial and pre-commercial varieties.  Continue reading

2020/2021 Wheat Data (County Standardized Trials)

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A great big THANK YOU to our County Agents and cooperating growers for getting in and out this year’s County Standardized Trials Wheat Test.  With Covid ramped up last fall, we had fewer entries into our trials because of issues with supply and workers in the warehouses.  I was happy to see such good yields across the state for a lot of growers.  Looking at our plant dates, early planted wheat had an advantage over planting middle to the latter part of November.  We had a few scares across the northern counties with the late freeze, and across much of the state during grain fill we were cooler and wetter than desired.  Our target varieties seem to be more tolerant to these stressors and in most cases, overcame.

The table below has the results from 8 County Trials, testing 13 varieties.  Our average range in yield was from 62 bushel to 131 bushel per acre with an overall average of 94 bu/ac.  UT recommendations are to select varieties in the “A” group as our top performers.

-MS (mean separation) Varieties with the same letter are not significantly different

-Orange Blocks show varieties’ yield above the location’s average

-% ≥ Avg. is the % of locations that variety is at or above the field 2021 wheat

Click on table for a full PDF