St. Charles, MO & Piper City, IL | Flex ear hybrids like Ammonium N late in life. Determined ears have a preset genetic and likes to see at least 60% up front to accomplish this. I used to use Pioneer 33B23 as my test animal. I could make that hybrids move 50 bu with N timing in the plots. If I see semi flex I treat them as a flex and the same for semi determined. When you cover the areas that I do you see all kinds of different genetics and farming habits. Kind of like the neighbor that puts on fall or spring ammonia vs the guy that Side dresses everything. They never seem t have the same performance of the hybrids as the other guy. Same soil type, fertility and rainfall. A lot comes down to N management |