May 11, 2023
It is still dry. Some areas in the SE part of the state have been blessed with timely rains (3 rain events since April 15th—at Plattsmouth totaling about 1.5”), but most areas are still in the grips of dry conditions. It is not the top 2-4 inches of the soil profile that is concerning—it is the subsoil that the crop relies on in July that is the current issue. We have experienced a few nights below freezing and a few days with temperatures above 90… So, it is an average Spring, right? April has been below average for temperature if you consider the averages.
April* Summary
May Summary
Highest Temperature (°F)
87.0
89.0
Lowest Temperature (°F)
18.0
37.0
Average Temperature (°F)
52.5
60.1
Growing Degree Days
102
100
Total Precipitation (in.)
0.84
0.98
*Beginning April 15, 2023
Observed at: Wilbur Ellis—Plattsmouth, NE (DI4759)
So, if corn was planted on or around April 15, it has accumulated 202 GDD and we have received a total of 1.82 inches of rain since April 15 in Plattsmouth as of May 9.
What about around the state?
Growing Degree Units by Location 4/10 – 4/20 – 5/1/2023
Cumulative 120 GDU for Corn Emergence
((Tmax+Tmin)/2)-50=GDD Tmax=86 Tmin=50
Total GDU Accumulation
Location
Total Since 4/10/23
10 Year Average from 4/10
Plant Date: 4/20/23
Plant Date 5/1/23
Beatrice
294
254
161
101
Grand Island
276
227
155
92
Lindsay
257
213
148
93
Early April planted corn has been slow in development and it shows, considering that corn has been planted for the better part of a month. These plants have been frozen off but have come back nicely—see below.
We use GDD to stage corn development all the time, however, there is not yet a model created for soybean. GDD can be used to predict the crop growth stages and help in making crop management decisions which are based on the growth stage of the soybean. Accumulated GDD is the method to determine the heat units accumulated at a given time during the growing season toward the maturity of the crop.
Some rain has occurred and I’m excited to see there is still a much-needed chance this week—hopefully everywhere. Planting and emergence are trending ahead of the average. Great time to get out and evaluate populations and follow back on challenging fields like these beans below that I almost wrote off 2 weeks ago, patience did pay off and in this case, replant will not be warranted.
National Crop Progress Summary
This Week
Last Week
Last Year
5-Year Avg.
Corn Planted
49
26
21
42
Corn Emerged
12
6
5
11
Soybeans Planted
35
19
11
21
Soybeans Emerged
9
NA
3
4
Nebraska Crop Progress Summary
NEBRASKA
Corn
Soybeans
This Year
56%
36%
Last Year
37%
27%
5-Year Average
51%
29%
Dr. John McNamara // Wilbur-Ellis Agronomist