Every year, when the calendar gets close to June, the question of whether to back off on relative maturity or not arises at least somewhere in the Hoegemeyer footprint. Some areas this spring have been continually hit with significant rain events that have not allowed corn planting to progress. No matter what date you planted your corn, it still takes about 125 growing degree units (GDU’s) for corn to emerge. In addition, research has shown that full season corn hybrids can also adapt to GDU’s needed for growth and maturity when planted later. For example, a corn hybrid will adjust to late planting by reducing the GDU’s necessary to reach black layer by about 6 units per day. An example would be a hybrid planted on May 20th that would require about 150 fewer GDU’s than the same hybrid planted on April 25th. Although the time required for a late planted hybrid to go from silk to black layer is increased, the time period from planting to flowering (tassel) is actually significantly reduced. Although later corn planting dates are not beneficial overall in terms of yield response, later planting dates will help accelerate emergence out of the ground and the plant will benefit from more measurable GDU’s per day after emergence compared to significantly earlier dates.
There is a point when backing up in maturity does make sense, especially as one moves north. In general, the best chance to approach optimum yield vs. planting date is still achieved by sticking with the normal adapted corn maturity for that area until the last week of May. After that, reducing maturity by about 5 days is justified as we approach June 1st. As we enter the 2nd week of June, reducing maturity by another 5 days is justified. Beyond the 2nd week of June, planting corn is usually not advised. Note that these estimates vary some depending on the individual situation and geography. If we were able to predict a cooler than normal grain filling period (August and early September), then one might error on the side of caution and plant an earlier hybrid the closer we get to June.
Questions regarding corn replant? Several factors come into play but as the calendar moves into the 1st week of June, more times than not, the best choice is to leave your remaining stand. Table 2 from Iowa State University gives estimated yield potential for corn at different final plant populations and planting dates.
Heavy, persistent rains have also delayed soybean planting for several areas of the Hoegemeyer footprint. Take a look at this article from UNL extension in regards to delayed soybean planting decisions and practices. http://cropwatch.unl.edu/delayed-planting-in-soybeans This article uses June 15 as a potential date to consider a 1/2 maturity group reduction (example would be reducing from a 3.5 RM to a 3.0 RM). However, we feel June 20 is a more relevant date for locations south of Interstate 80. As one moves north of Highway 20 in Nebraska and Iowa, June 1st can be used as a potential date for a ½ maturity group reduction (example would be reducing from a 2.5 RM to a 2.0 RM). Past situations would show that fuller season soybeans give the best chance for yield, especially as we move south, for several reasons:
1. Late planted full-season soybeans south of I-80 are not at the same risk of a fall freeze as those planted further north.
2. For the most part, short season soybeans do not move south well. Soybeans are triggered to go into reproductive mode based off daylight. They are more sensitive to photoperiod than corn. There is typically more heat as you move south, but also longer nights. Soybeans that are very early in maturity, that are planted late into a southern zone will potentially be very short and will not produce much for pods or canopy.
3. Fuller season soybeans still have the best potential to capitalize on late season rains come September and early October.
If you have specific questions about your farm, please don’t hesitate to contact someone on our Agronomy team. We are here to ensure the long-term success on your farm!
Depending on the specific geography, soybean emergence has either already taken place or soon will as soybean planting has begun to progress over the last week across much of the Hoegemeyer footprint. With some of the significant and frequent rain events along with the potential for some slightly cooler temperatures, it is possible that we may see some minor to moderate visual injury symptoms to fields that have certain pre-emerge herbicides such as the PPO inhibitors and photosynthetic inhibitors applied. Active ingredients for these herbicide groups include sulfrentrazone, saflufenacil, and metribuzin. Pre-emerge herbicides with these active ingredients have become quite popular due to the fact that they are generally quite effective at controlling troublesome small seeded broadleaf weeds that have become resistant to glyphosate (such as waterhemp and several others). Soybeans emerging under cool and wet conditions or when emergence directly coincides with a heavy rain event could be more vulnerable to injury. However, in the vast majority of cases, the visual symptoms which could include seedling stunting and cotyledon necrosis are short lived. The seedlings will typically resume normal growth once environmental conditions improve and the plant is better able to metabolize the herbicide.
ILeVO® fungicide soybean seed treatment (fluopyram) from Bayer Crop Science which was recently approved for commercialization in 2015 is very effective at protecting soybeans from both Sudden Death Syndrome (SDS) as well as Soybean Cyst Nematode (SCN). It is highly systemic into the root and crown of the seedling. Nearly 100% of all seedlings will exhibit minor to moderate visual injury symptoms on the cotyledons at emergence regardless of environmental conditions. Bayer calls this the “halo effect”. The most significant symptoms may take place in fields where ILeVO treated seed was used in conjunction with one of the pre-emerge herbicides listed above, especially under cool and wet conditions. However, once again the bark is often worse than the bite as research is showing that there is most often no impact on final stand or yield! Ironically, it is those cool and wet conditions that are also most favorable for SDS infection soon after planting.
So be aware, but not alarmed if you see what looks like some visual injury symptoms in a field of soybeans at emergence. There are multiple factors that could be playing a part. If you have any questions, be sure to contact your Hoegemeyer DSM or Agronomist.
Note: The vast majority of all Hoegemeyer soybean test plot seed was treated with Right Stand® + ILeVO® this year in order to give our products the best chance at fulfilling genetic potential.
Below are some links to resources including photos that may be useful in preparing for this potential situation.
Hoegemeyer believes in seed treatments as a means to capture greater yield by protecting the soybean seed from the start. Whether it’s on your own acres or when going up against the competition, Right Stand® and Right Stand + ILeVO® treatment packages protect the genetic potential on every seed, every bag and every acre!
Here's a few reasons why:
Wider Planting Window
Planting in cool, wet soils may result in slower emergence.
Increased disease pressure is possible.
Seed treatments allow for earlier planting dates and reduced replant.
Tolerance to High Residue Environments
Increased soil residues can harbor pest populations and disease pathogens.
Residue is associated with cool soil temperatures which may delay emergence.
Improved Soybean Plant Performance
Pest and Disease control
2.5 bushel average yield advantage for Right Stand over no treatment.
2-10 bushel yield advantage for Right Stand + ILeVO over base package depending on severity of SDS and SCN pressure.
Right Stand and Right Stand + ILeVO soybean seed treatment is a proprietary mix of chemistries including an insecticide, biological growth stimulant, and multiple fungicides offering broad spectrum protection. A common misconception is that seed treatments are only needed for early planting dates. Some insects and diseases are not limited to cool and wet conditions associated with early planting dates. An example would be Phytophthora Root Rot which is also very active under warm and wet soil conditions.
If you have any questions about soybean seed treatments, visit your Hoegemeyer DSM, Dealer or Agronomist.
Categories:Disease, Ryan Spurgeon, SoybeansComments:0Tags:
Hoegemeyer Agronomy Team, ILeVO seed treatment, Right Stand, Ryan Spurgeon, Soybean Seed Treatment, The Right Seed
It might be the best of all the possible problems a farmer can face.
Growers around the region who were fortunate enough to meet, or even exceed aggressive yield goals this season should make sure they’ve set some time aside to revisit their soil fertility plans after they’re done celebrating a successful 2015.
With Nebraska and Iowa pulling average yields of more than 185 bushels per acre this past year, it’s important to remember that more than just grain was removed at harvest. More yield equals more nutrients removed from that field.
That’s why it’s advisable to sit down and do a little math this time of year. By digging out your most recent soil test results and calculating nutrients removed and applied since that test, you can gain a good understanding of the potential nutrient supplying capacity of that field going into 2016. That understanding can play a pivotal role in making sure you put your seed in the best possible environment to succeed.
Research from Dr. Fred Below, professor of crop science at the University of Illinois, has shown how much fertilizer is taken up each day by high-yielding crops. For soybeans averaging 62 bushels per acre, nearly 17 pounds of fertilizer are removed from each acre every day during peak growth times. Meanwhile, corn yielding an average of 220 bushels per acre is removing nearly twice that amount, or more than 32 pounds of fertilizer per acre every day.
There are several tools available to help calculate nutrient removal, including the IPNI’s Nutrient Removal Calculator. Of course, it’s also a good idea to discuss with your retail partner who can address the potential need for an updated soil test or help create a fertilizer prescription that addresses the replenishment of key nutrients from the soil, based on what you will ask from it this coming season.
If you have any questions, please a member of your Hoegemeyer agronomy team or your local Hoegemeyer district sales manager.
A wet planting season, issues with nitrogen management, high disease pressure in corn and a warm, rapid dry down this fall — farmers experienced a lot in 2015. Even with all of the challenges Mother Nature dished out, farmers are experiencing higher than expected yield numbers and have finished the season strong. Hoegemeyer also planted five new hybrids this year that performed exceptionally well in competitive trials. This new class of hybrids ranges from 106–114 day maturities and has performed well in moderate to low planting populations, which is noteworthy as farmers look to trim input costs.
For more information about these new hybrids or other Hoegemeyer products, contact us today!