Tracking Corn Growth and Development: May 13 planting date emerged with problems
May 29, 2003 10(11):84-85
Joe Lauer, Corn Agronomist
Even though 2003 GDU accumulation is lagging behind the 40-year average for calendar
date, corn plants in the planting date experiment are developing right on schedule
for the GDUs accumulated thus far. The April 15 planting date reached V3 after accumulating
300 GDUs on May 28. The plants have started to green-up. We are through the root
transition period and nodal roots are starting to become dominant. Leaves are being
produced on the growing point of the plant. We still have numerous tools that can
be used to predict plant nutrient needs from soil fertility levels and manage weeds
and other pests.
The May 3 planting date is developing nicely. No obvious problems are apparent in
the plots. The growth stage is nearly at V2.
The May 13 planting date emerged right on schedule, but we have observed quite a
bit of underground unfurling of the plants. This phenomenon is seen when extreme
temperatures are observed between the time the coleoptile emerges from the seed
and but has not yet emerged from the soil. For this planting date about 5 days after
planting, few GDUs accumulated for about 3 days (May 19-21).
For 2003 we are loosing ground as far as normal GDU accumulation is concerned, but
this can be quickly made up as the season progresses. Our next planting dates are
June 1 and June 10.