Below you will find the daily maximum and minimum air temperatures, 2-inch soil temps, and 24-hour precipitation amounts for this week. These values are recorded at 8 AM and reflect the conditions for the previous 24-hour period (8 AM to 8 AM) at the Southern Research & Outreach Center, Waseca.
|Air Temp.||2” Avg. Soil Temp.*|
|– – – – – – º F – – – – – –||– – – º F – – –||inches|
COMMENTS: For the first time this April we observed a week with warmer than normal temperatures. We had a few warm days earlier this month but we could not string many days together like we did this week. A significant acreage of corn was planted in a short time and soil conditions were very good. Temperature averaged 55.6 degrees, which is 4.5 degrees warmer than normal. Rainfall totaled 0.79 inch or just 0.03 inch less than normal. Soil temperature at the 2-inch depth averaged 55 degrees which is 2 degrees warmer than normal.
Last year this week was cool and wet temperature averaged 47.4 degrees, rain fell on 5 of the seven days totaling 1.04 inches and 2-inch soil temperatures averaged 49 degrees.
Small grains have emerged, and look very good. It is amazing the difference between cool season crops like spring wheat and oats compared to corn. Planted on April 7 the wheat and oats are about 1-inch tall and the fields are beginning to turn a shade of green. Corn planted the same day has germinated, the radical (first root) is about ½ to 1 inch long, coleoptile (shoot) growth is about ¼ inch from the seed and is still well below ground level. Considering the temperature has averaged 43 degrees for this period the cool season crops have an advantage.
With a significant amount of corn planted early and in a short time this year soil applied herbicides may play a larger role in weed management this season. Remember most corn was planted before weeds emerged and our spring tillage did not remove any germinated weeds. This means weed seeds are still there ready to come soon. With a compressed planting season that also means postemergence applications will all likely be necessary at the same time. Having a soil active herbicide applied will help control early season weeds that are ready to come and enable a wider postemergence application window as well.