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Late N in Wheat      

Soybean Burndown

Early Planted Soybeans

 

Late N in Wheat

Continuous saturated soils in some areas has prevented timely application of nitrogen to wheat fields prior to Feekes stage 6 (jointing). Some of these fields are well into Feekes stage 7 or 8, and have not been topdressed. This brings the question- how late can I apply nitrogen to wheat?

  • Topdressing with nitrogen can remain effective through flag leaf emergence (Feekes 9)
  • If topdressing at Feekes 7, rates should be reduced by 10-15%, due to lower expected response to N
  • If topdressing is further delayed, through Feekes 8/9, additional reductions should be considered
  • Granular urea will minimize leaf burn and work well with rain to move the N into the rooting zone
  • If using UAN, reduce leaf burn by using streamer bars and diluting 50/50 with water

 

Soybean Burndown-Still a Priority

Even with delayed planting, “starting clean” and applying effective residual herbicides should remain a priority this spring. Marestail, ragweed, and waterhemp that is emerged will become increasingly difficult and costly to control after planting/crop emergence. With planting windows narrowing, this can become more of a challenge, but below are some considerations to keep in mind. Remember, always refer to specific herbicide labels for directions and planting restrictions.

  • FeXapan/Xtendimax/Engenia will have a fantastic use as a burndown in Xtend soybeans this year, due to no plant back intervals.
  • In non-Xtend soybeans, the use of dicamba at this point should not occur, due to a minimum plant back interval of 1” of rain, followed by 14 days waiting before planting.
  • 2,4-D ester products at rates up to 0.5 lb active ingredient per acre (ai/A) should be applied at least 7 days prior to planting. Higher rates will require longer windows from spraying to planting.
  • Sharpen, when used at 1.0 fl oz/A on most soil types, does not require a plant back interval, and thus is an option to use as a replacement for 2,4-D as we move later in the spring.
  • **Note**: when Sharpen is tank-mixed or followed sequentially with other group 14/PPO PRE herbicides (such as Sonic/Authority, Valor), a minimum of 14 days is required before planting.
  • Gramoxone (paraquat) may be considered as a burndown application. As a very fast-acting, contact herbicide, success is based on several factors:
  • Larger weeds and/or dense canopies provide the biggest challenge, due to the difficulty in achieving complete spray coverage
  • Carrier rates should be at least 15gpa, preferably 20gpa or more in dense canopies
  • Flat fan nozzles should produce medium-to-coarse sized droplets
  • Crop oil and metribuzin are important to increase efficacy
  • This is a “skull and crossbones” Danger/Poison chemical. Safe handling and application practices are essential.
  • Liberty (glufosinate) may also be considered; however, in Liberty beans, using glufosinate in the burndown will limit to only 1 possible POST application.
  • Larger weeds and/or dense canopies provide the biggest challenge, due to the difficulty in achieving complete spray coverage
  • Carrier rates should be at least 15gpa, preferably 20gpa or more in dense canopies
  • Flat fan nozzles should produce medium-coarse sized droplets
  • AMS and metribuzin are important to increase efficacy
  • Spray between 2 hours after dawn and 2 hours before sunset
  • Avoid spraying when heavy dew is present
  • Warm, sunny weather will maximize activity

Early Planted Soybeans

With a couple small breaks between rain events, some guys were able to get on those sandier soils on their farms. See the following video from N. Ohio field agronomist Alexandra Knight for thoughts on evaluating those stands- https://youtu.be/YZSR3wCTEgw

 

Some of what we are evaluating when a soybean crop emerges-

  • How do you determine planting depth after the soybean has germinated?  S-Curve
  • Population – The acceptable number here will depend on your soil type and the time of year.
  • Herbicide Damage- Is there any PPO splash? (The bronzing/browning on the outside of the cotyledons)

 

 

Agronomy information provided by:

John Schoenhals

Chasitie Euler