Entries by shawn conley spconley@wisc.edu

Soybean Crop Starting to Bloom

Across many areas of Wisconsin the soybean crop is just starting to bloom. According to the USDA crop progress report (7/6/08) the WI crop is slightly behind the 5 year average for bloom progress. This is due to two factors: fewer accumulated GDU’s in May and June and later soybean plantings. As we enter the […]

Soybean Aphids Starting to Show Up

When scouting your soybean fields over the next few weeks pay close attention to any elevated ant activity as an indicator of soybean aphid arrival (Image 1). Krista Hamilton (DATCP Entomologist) reported finding soybean aphids in Columbia and Dodge counties last week. This morning John Gaska and Branden Furseth (UW Soybean Extension and Research Program) […]

Pale Green Beans

As you drive across the countryside, field corn is not the only yellow crop in our Wisconsin fields. Many of our soybean acres have a pale green hue to them as well. Developmentally soybean does not start fixing nitrogen until the the V2/V3 (two to three trifoliates) crop growth stage, therefore they must rely on […]

How Long Will Soybeans Survive Under Water?

Soybeans can generally survive for 48 to 96 hours when completely submersed. The actual time frame is dependent upon air temperature, cloud cover, soil moisture conditions prior to flooding, and rate of soil drainage. Soybeans will survive longer when flooded under cool and cloudy conditions. Higher temperatures and sunshine will speed up plant respiration which […]

Soil Temperatures and Soybean Emergence

In our soybean seed size experiment we have been monitoring soil temperatures since planting on May 8th. Mean daily soil temperatures have ranged from 52 to 60 degrees F over this time. Preliminary research suggests that soybean requires ~145 (air) and ~165 (soil) GDD‘s base 50 degree F for emergence. The large difference between these […]

Aphid Numbers in Wheat are Low

Spring aphid treatments were applied to our Barley Yellow Dwarf Virus experiment on 5/6/08 at our Arlington, Lancaster, and Janesville sites. Wheat growth stage varied among our planting dates and ranged from Zadoks 14,22,30 (Feekes 4-5) “pseudostem erection” to Zadoks 16, 29, 31 (Feekes 6) “1st detectable node”. Across all of our plots we found […]

Wheat Stands at Chilton and Lancaster

On Monday April 21st we assessed winter injury at our Chilton WI variety test site. Some ice damage was present, however the damage was isolated to low lying areas. Wheat stand and tiller counts were excellent outside of these areas. The growth stage was a Feekes growth stage 3 or Zadoks growth stage 15 (five […]

Winterkill and Tiller Counts

The last two days have lead to some very interesting findings in our wheat research plots at Arlington WI. Winterkill for the most part was limited to areas where ice was standing for several weeks (>2.5 weeks). Winterkill damage was greater in our early (9/14/07) and “normal” (9/28/07) winter wheat planting dates than in our […]