All posts by Ryan Blair, County Variety Trial Coordinator

Management Practices to Optimize Nitrogen Fertilizer Use with High Fertilizer Prices

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

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

 


2020 County Standardized Trial Handout

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2020 CST handout_full

A special thanks to all cooperators, agents, and all others who make the County Standardized Trials Program a success.

With Covid limiting in-person meetings and office visits, I want to make available the 2020 CST handout.  The above link is available for you to use in assisting variety/hybrid selection for the coming season.  Agents, feel free to print and send out or send this attachment to your row crop producers via email.  The full report above contains data from 2019 and 2020 for corn and soybean, 2020 Wheat, and 2020 Cotton.

The following links are segments of the full report to simplify searches through all 2020 CST data.

2020 CST Corn Results

2020 CST Soybean Results

2020 CST/OVT Cotton Results

2020 CST Wheat Results

 

 


Preliminary 2020 Cotton CST Data released

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Preliminary data from the 2020 TN Cotton CST Data is now available.  We are releasing an average table for the XtendFlex trials and the Enlist trials today.  We only tested the XtendFlex and Enlist varieties together in a handful of locations.  I will release the average tables from those locations later, along with results from each individual location.  Also, stay tuned for the OVT small plot trial data average table which includes 44 commercial and pre-commercial varieties.  The last of the OVT samples should gin during the first of next week. Continue reading


2019-2020 CST Wheat Variety Trial Results-

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County Standardized Trial (CST) Wheat Results are now available. The 2019 planted wheat crop had it’s challenges to say to the least. Between delayed harvest of the 2019 crop, wet fall, wet spring, late freezes etc. this crop had everyone guessing how it would turn out.
The CST program was able to use data collected from 7 locations (Carroll, Fayette, Gibson, Madison, Moore, Weakley, WTREC) to compile this dateset representing 18 varieties commonly available to TN producers. Overall, the varieties averaged 70 bu/ac with a location average range from 52-97 bu/ac. Varieties are separated statistically at a 95% confidence interval indicated by the Mean Separation, “MS” column. Varieties that have the same letter in the MS column are not significantly different from each other.
CST plots are on-farm large strip trials in design, with a minimum plot length of 300 ft. These plots are conducted using common agriculture practices supported by UT recommendations. Special thanks to everyone involved, especially those cooperating producers and County Agents who make this possible .


2019 TN Cotton Variety Trial Results now available

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The 2019 TN Cotton Variety Trial Results Publication (PB1742) is now available online. This document contains detailed results from all harvested trails in the 2019 University of Tennessee Cotton Variety Testing Program.  This expanded publication follows the recently published summary publication, the 2020 TN Cotton Variety Guide (W285) which was released a few weeks ago.