05/07/2026
We are about to exit the “ugly duck looking crop phase”!
As a reminder it takes 82 GDU’s for a new corn leaf to form and 75-100 GDU’s for a new soybean trifoliate to form. For the past week I am guessing we are around maybe 42-50 GDU’s total. Good news is after today we get back into double digit daily GDU’s and a week from now we should have accumulated just over 100 GDU’s so sit tight things are about to get growing and green up and our best stands we have seen in a long time will look really good in a week!
We normally see this every year, it’s normally just 15-20% of the crop not 90% of the crop planted going thru this phase.
Here are two excerpts from Bob Nielsen’s timeless article about young corn in the transition phase. Read and see if it has a familiar ring…
Every year, for the first five weeks or so after corn planting is finished, the guys down at the Chat 'n Chew Cafe complain royally about the looks of the crop. It does not matter whether it was an early planting season or a late planting season. Gripes about uneven stands, poor color, and slow growth waft over the tables as everyone airs their concerns about the looks of their neighbors' fields.
READ THIS. During this important transition from dependence on kernel reserves to dependence on the nodal root system, corn seedlings are easily sidetracked when growing conditions are not adequate for maximum photosynthesis and rapid development of the nodal root system. Consequently, the appearance of corn seedlings during these early leaf stages can be downright ugly during extended periods of cloudy, cool weather. Throw in some excessively wet soils plus a little soil compaction plus a pinch of frost damage and you have a good start on a recipe for "crappy" stands of corn. The best remedy for most fields of yellow-green corn seedlings suffering from the effect of "crappy" growing conditions is the return of ample sunshine and warmth.