Growing Degree Days through June 2

Jarrod O. Miller, Extension Agronomist, jarrod@udel.edu

Steady warm weather and periodic rainfalls have moved corn along pretty well. Most corn planted here in Georgetown in late April is at V6-7 and has been sidedressed. Fields planted through mid-May are at V5/V6, matching the predicted GDD pretty well.

The next milestone to watch for would be tasseling (VT), which occurs at 1135 GDD. At this stage just consider how weather may determine pollination and later grain fill as another determinant of final yield.

Table 1: Accumulated growing degree-days based on planting dates through May 20th.

If you planted

Sussex Kent New Castle
Apr 14 805 760 723
Apr 21 713 669 636
Apr 28 632 593 556
May 5 532 512 484
May 12 431 414 393
May 19 361 350 333

V6 = 475 GDD, V12 = 870 GDD, VT = 1135 GDD, R1 = 1400 GDD

Statewide Temperatures Since April 1st

Statewide Rainfall Accumulation Since April 1st