The University of Maryland and University of Delaware are looking for farmers throughout both states to participate in a research project evaluating decision making surrounding adoption of nitrogen management tools (commercially available N models, drone imagery, PSNT). We will implement a field trial in the 2021 growing season that contains six nitrogen rates applied to corn in four replicates in strips (~15 ft wide by 300 ft long) requiring about 2.5 total acres. Participants will be trained on the use of various nitrogen management tools and will be paid for their participation in the trial (W9 submission to UMD required for payment) pending eligibility to receive EQIP funding. Participants must have the ability to apply prescribed nitrogen rates and record yield at harvest using a calibrated yield monitor. We require participants to participate in a pre-season interview (in April 2021), a one-on-one post-harvest debrief session, and a focus group in November or December, all likely taking place virtually due to COVID restrictions. Farmers who have not previously partnered with Extension on research projects are encouraged to participate. If interested, please contact Dr. Nicole Fiorellino at University of Maryland at nfiorell@umd.edu and Dr. Amy Shober at University of Delaware at ashober@udel.edu.
Delaware Agronomy Blog
University of Delaware Cooperative Extension
Category: Corn (page 4 of 7)
January 20th, 2021
9am-4pm.
You must register to attend and have access to the quizzes for credits: https://udel.zoom.us/webinar/register/WN_EVCIBMb_RvqoDjAOL3S0ww.
Current credit approval:
Nutrient Management : DE (2 credits), MD (2 credits)
Pesticide Continuing Education: DE (4 credits Private and 1A).
CCA Credits (Full Day): 4PM, 1.5NM, 0.5PA.
The full schedule is below
Continue reading
The standard method used to follow and predict corn growth stages is using growing degree days (GDD). This is a calculation that uses average daily temperatures to measure accumulated heat over the growing season. Most of the GDD values we use are from the Mid-West, so we have followed a few research fields the past two years to compare how DE lines up. We have also included days from planting and light accumulation (pulled from DEOS) to compare other measurement methods (Table 1 – flip phone sideways for best presentation).
| Table 1: Following Corn Vegetative Growth Stages (2019-2020) | ||||||
| Emerge | V3 | V6 | V9 | V12 | VT | |
| Days from Planting | 5-13 | 12-31 | 22-48 | 35-63 | 44-76 | 53-82 |
| Growing Degree Days | 84-150 | 219-310 | 492-603 | 787-950 | 1001-1337 | 1231-1322 |
| Total Light | 125-302 | 271-609 | 530-996 | 828-1343 | 1055-1664 | 1265-1508 |
Jarrod O. Miller, Extension Agronomist, jarrod@udel.edu; Cory Whaley, Sussex Co. Extension Ag Agent, whaley@udel.edu;
Figure 1: Dough stage (R4) with some denting present.
At this point in the season many fields may have started to show signs of dent, but this is a slow transition that sits between two reproductive stages. At the dough stage (R4), the milky fluid is drying down, giving the kernel a soft, dough like consistency (Figure 1). As some of these kernels continue to dry and starch forms at the crown, a dent will form on the outer edge of the kernel. However, to be at the actual dent stage (R5), almost all of the kernels should have the dent feature (Figure 2). Continue reading
We are observing a range of deficiency issues this year in corn, many of which have similar symptoms. Last week we had some images of a field with pale yellow leaves and some interveinal chlorosis that turned out to be a sulfur deficiency (https://sites.udel.edu/weeklycropupdate/?p=15087). This week we have similar symptoms, but a different diagnosis. Across this field (Figure 1), some corn appears pale and stunted, and upon closer inspection (Figure 2), there is also some stripping (interveinal chlorosis) along the leaves. Continue reading
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