Have a  field where we planted corn into spring wheat stubble. On one end there was a strip of rye coming. Here is what i observed.
 There was two different hybrids that were planted in the strips.
 In the rye strip(picture 1) hybrid A had 4 leaf collars and was 10 inches tall leaf over and hybrid B had 3 collars and was 8 inches tall.
 Exiting the rye strip the plants were shorter( left side of picture 2 ) Hybrid A had 4 leaf collars and was 7-8 inches tall and hybrid B had 3 leaf collars and was 6 inches tall.

(harlans north of trees spring wheat stubble corn 6 16 2011 002.jpg)

(harlans north of trees spring wheat stubble corn 6 16 2011 004.jpg)

harlans north of trees spring wheat stubble corn 6 16 2011 002.jpg (75KB - 59 downloads)

harlans north of trees spring wheat stubble corn 6 16 2011 004.jpg (77KB - 63 downloads)