The Certified Crop Adviser (CCA) Exam Training program, delivered by OSU Agronomic Crops Team members, will be available online and in-person to help you prepare for the 2022 CCA exams. An in-person two-day training class will be held on January 12 & 13 from 9 AM to 5 PM each day at the Shelby County Ag Building, 810-820 Fair Rd, Sidney, Ohio 45365. The content is a great basic agronomy course covering information to prepare for the local CCA exam. The cost for this program is $250/person. Registration includes the publications below, lunch both days, and other program materials. Class size is limited to 25, and registration closes on December 20, 2021.
Publications provided with the in-person option:
- Ohio Agronomy Guide
- Ohio, Indiana & Illinois Weed Control Guide
- The Ohio Corn, Soybean, Wheat and Forages Field Guide
- 2020 Tri-State Fertilizer Recommendations
- Modern Corn & Soybean Production
A commonly asked question about fall herbicides – how late in the fall can herbicides be applied and at what point is it too cold to apply? We have applied well into December under some very cold conditions and still obtained effective control of winter annuals. We suggest applying before Thanksgiving and aiming for a stretch of warmer weather if possible, but the effective treatments should work regardless. Extended periods of freezing weather will cause the perennials to shut down – dandelion, thistle, dock.
We received a lot of questions about annual bluegrass this year, especially regarding difficulty in controlling it in the spring. Fall is a good time to control this weed. This will require the addition of glyphosate to whatever herbicide mix is being used. Continue reading
By: Alex Lindsey OSU Extension
As fall is progressing, crop harvest is also occurring throughout the state. However, many producers are seeing slower than usual drydown in their corn fields this October. This may be in part due to how the weather conditions impacted corn growth and development this year.
In many parts of Ohio in 2020, temperatures were near the long-term average this season. One marked difference though was that precipitation was below normal for much of the season around the state. In the table below, I have shown 2020 weather progression compared to that of 2018 at the Western Agricultural Research Station, specifically highlighting average temperature and accumulated precipitation. Continue reading
By Mark Loux OSU Extension
In our windshield scouting of soybeans this year we have seen a lot of weedfree fields. This makes sense given the shift toward Xtend, LibertyLink, LLGT27, and Enlist soybeans over the past several years, which provides us with effective POST options for our major weed problems – common and giant ragweed, marestail, and waterhemp (now if we could just get rid of the baggage some of these traits carry). We are however getting manyreports of late-season waterhemp as it grows through the soybeans and becomes evident. This also makes sense given that statewide we are in the midst of an overall increase in waterhemp, and continue to move up the curve in terms of number of fields infested and the size of the infestations. Prevention and management of waterhemp and Palmer amaranth has been one of the primary goals of our state and county educational programs for half a decade or more. And one of the most important points about waterhemp and Palmer that we try to get across is their capacity for prodigious seed production – 500,000 to upwards of a million seeds per plant – and what this means for their ability to rapidly ramp up populations, infest equipment, etc.
The bottom line here is that it’s essential to scout fields this time of the season and kill or remove plants that could produce seed. Allowing even a few plants to produce seed means an increased population for the next year or two at least. Running harvest equipment through planst loaded with seed is a primary mechanism of spread from field to field. Plants can survive into late season because they emerged after herbicide treatments, or survived an improperly timed and less than effective POST treatment. These plants should produce less seed than plants allowed to grow full season without interruption. It’s also possible given waterhemp’s propensity to become resistant to any herbicide used against it, that the survivors are resistant to whatever POST herbicide was used. Resistance to glyphosate, ALS, and PPO inhibitors is widespread in Ohio, and we expect the development of resistance to dicamba, 2,4-D, and glufosinate will occur given their intensity of use (which is why the current period of clean fields makes us nervous). The only way to ensure that resistance does not develop is to follow herbicide programs with later season scouting and removal of plants to prevent seed. Continue reading
By Mark Loux OSU Extension
OSU weed scientists and ag engineers are looking for soybean fields that have populations of waterhemp or Palmer amaranth surviving into July and August (after all control with herbicides has been attempted). We have a project involving the use of a drone to identify these weeds in mid to late season when they are evident above the soybean canopy. We need fields with more than just a few surviving plants. Populations consisting of a few good patches up though a disaster are fine. Contact Mark Loux – firstname.lastname@example.org, 614-395-2440. Thanks in advance for your help.
By: Mark Loux and Bruce Ackley, OSU Extension
The maps that accompany this article show our current knowledge of waterhemp and Palmer amaranth distribution in Ohio. These are based on information from a survey of OSU Extension County Educators, along with information we had from samples submitted, direct contacts, etc. We still consider any new introductions of Palmer amaranth to be from an external source (brought in from outside Ohio) – hay or feed, infested equipment, CRP/cover/wildlife seedings. Palmer is not really spreading around the state, and as the map shows, we have had a number of introductions that were immediately remediated. The number of counties where an infestation(s) is being managed is still low, and within those counties, the outbreak occurs in only a few fields still. Waterhemp is much more widespread in Ohio and is spreading rapidly within the state from existing infestations to new areas via equipment, water, animals, etc. We do not have Ag Educators in all counties, and even where we do, infestations can occur without us knowing about them. Feel free to contact us with new information to update the maps. Continue reading
By Peter Thomison OSU Extension
There have been reports of slow corn emergence in some areas and that corn planted more than two weeks ago is not yet emerging. Is this cause for concern? Not necessarily. Corn requires about 100 growing degrees days (GDDs) to emerge (emergence requirements can vary from 90 to 150 GDDs). To determine daily GDD accumulation, calculate the average daily temperature (high + low)/2 and subtract the base temperature which is 50 degrees F for corn. If the daily low temperature is above 50 degrees, and the high is 86 or less, then this calculation is performed using actual temperatures. If the low temperature is less than 50 degrees, use 50 degrees as the low in the formula. Similarly, if the high temperature is above 86 degrees, use 86 degrees in the formula. The high cutoff temperature (86 degrees F) is used because growth rates of corn do not increase above 86 degrees F. Growth at the low temperature cutoff (50 degrees F) is already near zero, so it does not continue to slow as temperatures drop further.
By: Jim Camberato and Bob Nielsen Purdue University
Although nitrogen (N) fertilizer can be costly, it is needed to optimize profit in Indiana cornfields. Applying too little N reduces profit by reducing grain yield. Too much N does not return value and can also damage the environment.
Results from 167 field-scale N response trials conducted over more than 10 years underpin current region-based N recommendations. These data-driven N recommendations replaced the old yield-goal based system1, which was proven ineffective. Current recommendations represent the N rate for maximum profit over the long-term, but differences in soil type, management, and weather can result in lower or higher N requirements in any given situation. Rainfall after N application will primarily determine the efficiency of applied N2, with excessive rainfall causing higher N loss and greater need for fertilizer N. Although N applied prior to planting this season has not been subject to conditions promoting N loss in most areas of Indiana, N loss can occur season-long, particularly prior to the V8 growth stage when corn N uptake and water use are relatively low. Continue reading