July 6, 2016 Weekly Crop & Weather Update

This update is also available in a print-friendly pdf format: July 6, 2016 Weekly Crop & Weather Update

Below you will find the daily maximum and minimum air temperatures, growing degree units (GDUs), 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 (oF) GDUs Precip
Date Max Min (inches)
Thursday, 6/30 82 58 20.0 -
Friday, 7/1 77 54 15.5 0.58
Saturday, 7/2 73 54 13.5 -
Sunday, 7/3 79 55 17.0 -
Monday, 7/4 78 56 17.0 -
Tuesday, 7/5 78 60 19.0 -
Wednesday, 7/6 87 64 25.0 0.74

A couple of timely rains and cooler conditions came to the Waseca area this week. Temperature averaged 68.2 degrees or 3.9 degrees cooler than normal. Two rain events resulted in 1.32 inches, which is 0.29 inch more than normal. Growing degree units (GDUs) totaled 142 or 11% less than normal. Since May 1, we have now accumulated 1074 GDUs. This is 7% more than normal.

Last year this week was cool and slightly dry with temperature averaging 67.3 degrees and 0.85 inch of rain fell. We had accumulated 961 GDUs at this time last year.

Rainfall totals will vary across southern Minnesota, but the cool weather will likely benefit the corn crop that was showing signs of stress before this week. Corn is now in a critical time as it enters the pollination period. The cool weather reduced stress and the rain received in Waseca will be very helpful during the next week as corn will be tasseling. The corn crop is using a great deal of water now and an inch of rain per week will help meet those demands.

Soybeans are in the R2 (full flower) stage. Aphids can be found on soybeans, but populations are still quite low. Waiting until the recommended threshold (250 aphids per plant on 80% of the plants and an increasing population) reduces the chance that re-treatment will be necessary later in the season. Treating too early can harm natural predators and make for an environment that aphids can thrive in later.

June temperature averaged 70.6 degrees or 2.1 degrees warmer than normal. Rainfall totaled 4.75 inches which is 0.06 inch less than normal. The distribution or rainfall was not very good as over 3 inches of the rain came in one day. Other then some ponding, June was a good month for crop production.

REMINDER: Crop Management Tour to be held at University Center in Rochester on Thursday, July 7. Flyer is attached providing speaker and topic details.