Clay County Growers Association
Clay County Growers Association
homenewsletterweather infoexperimental plotscompanies participatingcontacts

About Us

Clay County Growers Plots are located eight miles south of Spencer on Highway 71. Fields are open to public viewing at any time.

Posted On August 13, 2018 2:58 PM
Clay County Growers Plot Day
Public Welcome!

Clay County Growers Association Annual Plot Tour
Tuesday, August 21 8 miles south of Spencer on Highway 71.
5:30 - Registarion
6:00 Iowa Chop dinner grilled by Clay County Pork Producers
6:30 Program with updates from plot manager Sam Harper, ISU Extenstion Agronomist Paul Kassel, updates from the Iowa Soybean Assoication and Iowa Corn Growers.  

The meal is $5 per plate.  Rain date is Thursday, August 23. 
Questions call Sam Harper at 712-339-5002

Posted On June 12, 2018 10:19 AM
Spring Planting
The Clay County Growers Plot was planted probably one of the lateset if not latest this year.  Wet conditions and a let warm up delayed the planters.  The corn was planted on the North this year on May 18, 2018.  It was spiking in six days.  The soybeans were planted on May 31, 2018 and in just a few days emerged.  Look for the input and planting charts on the site soon.

The cover crop project has gotten off to a slow start. In copperation with the Iowa Soybean Association and Chuck White the north farm was strip tilled November 2017.  We planted cereal rye in the east end in replicated trial were we put rye in into th estrips and onto top to compared.  We strip tilled without fertilizer the corn stubble n th esouth side as well.  we broadcast spread rye in replicated trials on that side.  Unfortunatley the temps were falling and no germination occured until this spring and that was only a couple weeks before planting. We don't expect to see a great deal of response in year one at this point, however we will know more at harvest.

Posted On October 23, 2017 1:35 PM
Soybean Harvest 2017

Posted On August 8, 2017 10:11 AM
Field Day

Posted On August 4, 2017 12:30 PM
Field Day Aug 16
Preperations are under way for the upcoming Field Day August 16

Posted On July 7, 2017 9:43 AM
Plot open to public
Stop by the Growers plot anytime.  The seed companies are putting up their signs.  The corn and beans are looking very good so far.  Post spraying was completed earlier this week and corn was completed two weeks aog.  Side dressing was done at that time to.  Plot day will be on August 16.  Mark your calendar.  

Watch the weekely drought monitor.  We are starting to get a little dry and the forecast has some 90 degree days.  I did not record many stress deays the past couple years.  June had seven and July has had 4 so far.  That could lead to a reduction in yield compared to the records of the past two years if we continue with hot days during pollination.

Posted On May 17, 2017 11:22 AM
2017 Growers Plot is planted
Greetings!  The plot has been planted!  The corn was planted on May 13 and the soybeasn were planted on May 16.  You can view the various entries by clicking on the tabs showing the spreadsheets for 2017.  The corn is planted on south farm, soybeans on the north.  It is open to the public.  More information about fertility, herbcides will be posted soon.

Posted On April 27, 2017 1:44 PM
Planting Intentions
The seed has been coming in for the Plot.  I had hoped to plant the fisrt week of May.  Right now mother nature is in the drivers seat.  She needs to turn the heat and dry off.  Stay tuned for more planting updates.

Posted On February 22, 2017 11:19 AM
Accepting Seed Company Entries
We are still accepting seed entries for 2017.  We will be looking at trials for both conventional and traited corn again this year. Soybean trials will include Liberty, Xtend, and RR2 varieties this year.  Please contact Sam Harper at 712-339-5002 or email at for further information.  We are also always looking for volunteers who have an interest in assisting with the plot in various capacities.  Conatct me if you are interested.

Posted On February 15, 2017 10:59 AM
On-Farm Network result for 2016
The On-Farm Network has posted our resulst for the replicated trial we did at the plot.  You can view them by clicking on th eexperimental tab and clicking on the links.   

Posted On October 26, 2016 1:03 PM
Corn Harvest Completed!
The corn harvest is complete at the Clay County Growers Plot.  View the results by looking in the Corn Results to the right.  You can find the whole GMO results, results by maturity, and Non-GMO yields.  Go to the experimental tab and look at the population study for those results.  The Corn averaged 207.4 in the GMO and 207.9 in the Non-GMO trials.  The high was in the Non-GMO with 230.9 with 105 day Beck's 5140.  The GMO high was 104 day Nutech 5L-504 with 228 bushel.

Posted On October 20, 2016 9:06 AM
Soybean Harvest Results available
Soybean Yield results are available for the 2016 trials.  Click on the appropriate file in Bean Results box to the lower right on this page.  The LL beans averaged 69.8 bushels, Xtend averaged 71.1 bushels, and the R2Y soybean average was 70.7 bushels.  You can also view the ranking by matuirity group.  Use this to find consistant varieties to plant on your farm for better odds of succes in the future.  Click on the experimental tab for the iLeVo seed treatment trial preliminary results.  *Note: Low Soybean Cyst Nematode numbers were observed by testing soil this season and there was low Sudden Death disease present in th eplot this season.

Posted On August 19, 2016 9:34 AM
Clay County Growers Plot Day
Tuesday, August 16 the field day was held.  80 area growers attended the evening.  David Kruse, Author of the Commstock Report, Pat Chase, NRCS agronomist, and Paul Kassel, ISU Extension field agronomist all provided great information during the program segment of the evening. The Iowa Chops grilled by the Clay County Pork Producers was also a big hit for the night.  Watch for harvest results later this fall.

Posted On July 29, 2016 4:07 PM
Clay County Growers Plot Day
The Annual Clay County Growers Plot Day is scheduled for Tuesday, August 16.  Registration begins at 5:30 pm at the plot located approximatley 8 miles south of Spencer on the East side of Highway 71.  A pork chop dinner grilled by the Clay County Pork Producers will be served at 6pm.  A program will begin at approximatly 6:45 pm.  David Kruse of the Commstock Report will share his market commentary first followed by Mike Henderson, area NRCS agronomist, and Pual Kassel, ISU Extension regional Agronomist.  Henderson will be sharing information about the NRCS rainfall simulator, and Kassel will be reviewing current agronmic issues.  There is a $10 cost for the program to help defray the cost of the dinner. Tickets can be purchased in advance from Plot Manager Sam Harper.  Contact Sam at 209 Main St in Royal, Ia or 712-339-5002.  Tickets can also be purchased at the event on Tuesday August 16.  See you there!!

Posted On May 25, 2016 11:31 AM
Planting Updates
The soybeans have been planted at the Plot!  The grower, Roger Nelson, along with several helpful individuals including members of the Clay Central Everly FFA chapter arrived at 9 am Tuesday May 24.  We finished up about 7pm.  There are 15 Liberty Link entries, 17 Xtend soybeans entries, and 68 Round Up Reay 2 entries this year.  We also did a seed treatment study with ILeVo from Bayer.  There 4 replicated trials that we will glean data from at harvest.  Bayer has provied us with a weather station this season.  To view the location weather conditions you can log in to:
user ID: ISA0000050
Password: 23929

Info will be in the me weather and summary tabs.

Posted On May 12, 2016 8:31 AM
New portable weather station
We are going to be conducting an ILeVo soybean seed treatment trial this year using On-Farm Network protocols.  The seed treatment is provided by Bayer.  Bayer has also set-up a portable weather station for us to monitor the weather live at the plot.  Soon I will have more information that growers can log in and see what the weather at the plot is doing. Stay Tuned!

Posted On May 9, 2016 3:43 PM
Corn planted on May 7
The corn for the yield trials and research were planted on Saturday, May 7.  We started planting approximatley 9 am and finished up shortly after 6pm.  Many thanks to those that helped.  There were 26 entries for Non-GMO corn starting on the west end of the plot.  We then planted 83 GMO entries.  At the west end of the plot we are conducting a population study through the On-Farm Network.  We planted four replications each at 32K and 37K using Wyffles 2276 in 12 row blocks.  I will be posting the seed entries on the sit esoon.

Posted On December 29, 2015 1:32 PM
Soybean Trial 15" vs 30" row spacing
Click on Experimanetal Plots to view the On-Farm Network Soybean trial results for th eplot this year. 

Posted On December 15, 2015 9:42 AM
On-Farm Network
The corn trials can be viewed by going to the experimanetal tab and clicking on the link.

Posted On August 27, 2015 11:21 AM
Plot Tour Success
Plot Tour 2015 was held Wednesday night.  The weather was Awesome and the crowd was even better.  Look for harvest data in the coming weeks!

Posted On July 30, 2015 8:43 AM
Clay County Growers Plot Day
SAVE THE DATE!  Come to our annual Plot Day on Wednesday August 26, 2015.  We are located south of SPencer, Iowa on Highway 71, East side of the road.  

Registration begins at 5:30 pm
Steak dinner grilled by the Clay County Catleman 6pm
Program 7pm
Plot Updates - Sam Harper Plot Manager - Pro-Crop Farm Management
                   David Kruse - Commstock Report
                   Richard Stessman - On Farm-Network/Iowa SOybean Association
                   Representative from Iowa Corn Growers Association

Steak Dinner/Program is $10 at the event.  Sign up to recieve the final plot data when you register.  
Questions call Sam Harper 712-339-5002

Posted On July 15, 2015 4:09 PM
Highway 71 is now open!
Come visit the plot.  The highway os open.  Seed companies will continue to hang there signs.  There is a map on the back of the plot billboards to help you find different numbers.  Please thank our partners and seed companies for their time, funds, and efforts.

Posted On July 7, 2015 9:10 AM
Climate Pro Vegetation map
This is the vegetation map from Climate Pro taken by satallite on July 3. 

Posted On July 7, 2015 8:56 AM
Crop Progress Report July 3
I have been watching the Climate Pro software this year to track precipitation and Temprature.  In addition the Pro feature allows me to monitor scouting maps and vegetation maps that are taken periodically by satallite. This image was taken July 3.  The area on the East end is where we are conduting the Nitrogen research.  Some rows were side dressed an additional 50N.

Posted On June 8, 2015 10:34 AM
Crop Progress Report June 8
It's a bit more challenging to get to the plot with Highway 71 under construction.  You can get there by either 430th St or 420th St.  These are both gravel roads.  Go around the baricades and travel towrds the plot entrance.  Watch for the construction trucks, they have the right-of-way.

The corn and soybeans are all growing well.  The corn was sidedressed on June 2.  I have flagged the side-dressed passes in the research area.  I also flagged the narrow rows in the beans on th each end.  I have ordered both sides to get post applications of herbicides, hopefully this week.


Posted On May 14, 2015 10:37 AM
Soybeans planted May 13, 2015
The Clay County Growers have successfully planted the Plot for 2015.  Now it's up to mother nature and the genetics from all the seed compnaies to produce a great crop.  The corn was planted on May 1 and the soybeans on May 13.  The soil conditions were very good. We could use some heat from here on out as it has been somewhat cool.

Posted On May 4, 2015 9:14 AM
The corn was planted on Friday May 1 after a rain delay tried to derail our efforts.  Many thanks to the volunteers who were able to help.

Posted On April 28, 2015 12:58 PM
Corn Planting Scheduled
The Clay County Growers are excited to plant corn.  We plan on starting at 9 am on Friday May 1, 2015.  Fell free to come see how we are progressing.  You might even get th echance to help out if you would like.  Soybeans will be scheduled at a future date.  Please stay posted for more information.  This is all the seed sitting in the seed shed.  I am in the process of sorting it in preperation for planting.

Posted On March 10, 2015 10:55 AM
Seeking Seed Numbers
The planting season is fast approaching.  I am building a spreadsheet for the planting of the plot.  If you have not sent me a copy of the numbers you plan on entering into the plot please do so as soon as possible. Additionally if you have not sent in your confirmation that you are participating in th eplot this year please let me know ASAP.


Posted On December 19, 2014 9:59 AM
Clay County Grower's Plot "Under New Management"

After many years as the plot manager Dave Hessman has made the decision that it was time to pursue other interests.  However that does not mean the plot and the great work we have accomplished in the past is ending.  Sam Harper, of Pro-Crop Farm Management & Consulting has agreed to take over the management duties of the plot.  We would like to thank Dave for his years of service and wish him well!

Hello!  My name is Sam Harper.  First, I want to thank you for reviewing our data over the years.  The results for 2014 were mailed out in November and should be posted to the website soon. It was another challenging year with all the rain in early June but for the most part the entries performed well.  We are planning on resuming the annual meeting again in 2015!  Saty tuned for announcements during planting time to save the date.

You can contact me at with any questions or comments.

Corn Results
2018 Non GMO Corn results
2018 GMO Corn
2018 crop inputs
2017 Conv. Corn 105-109 day
2017 Conv. Corn 97-104 day
2017 Conv. Corn
2017 RR Corn 105-114 day
2017 RR Corn 101-104 day
2017 RR corn 94-100 day
2017 RR corn All
2017 GMO Corn plantings
2017 Conventional Corn plantings
2016 Non-GMO Corn Yields
2016 GMO Yield by Maturity
2016 GMO Corn Yield Results
2016 Non-GMO planting guide
2016 GMO Corn Planting guide
2015 Corn Results ranked in maturity groups
2015 Corn GMO Whole Plot Results
2015 Conventional Corn Results
2015 Conventional Corn Lineup
2015 RR Corn Lineup
2014 Test Plot Results
2014 top 10 yields
2012 Top Ten Yields
2012 Test Plot Results
2011 Top Ten Yields
2011 Test Plot Results
2010 Test Plot Results
2009 Top Ten Yields
2009 Test Plot Results
2008 Test Plot Results
2007 Top Ten Yields
2007 Test Plot Results

Bean Results
2018 Xtend Soybean Results
2018 RR Soybean Results
2018 Liberty Soybean results
2017 Liberty Results
2017 Xtend Soybean Results
2017 RR2 Soybeans
2017 LL Soybean Plantings
2017 Xtend Soybean Plantings
2017 RR Soybean Plantings
2016 R2Y Soybean by maturity results
2016 R2Y Soybean whole plot results
2016 Xtend Soybean Results
2016 LL Soybean Results
2016 Xtend Soybean Planting Guide
2016 R2Y Soybean Planting Guide
2016 LL Soybean Planting Guide
2015 Conventional Soybean Results
2015 Soybean RR results by Maturity
2015 Soybean RR results
2015 Conventional Soybean lineup
2015 RR Soybean Lineup
2014 Top Ten Yields
2014 Test Plot Results
2013 Test Plot Results
2012 Top Ten Yields
2012 Test Plot Results
2011 Top Ten Yields
2011 Test Plot Results
2010 Top Ten Yields
2010 Test Plot Results
2009 Top Ten Yields
2009 Test Plot Results
2008 Test Plot Results
2007 Top Ten Yields
2007 Test Plot Results
You Need Adobe Reader® To View Our Results. Get It Here
Copyright © 2007. Clay County Growers Association