Green-up marks the time to apply N in winter wheat
"Stands need to be evaluated for estimated yields compared to other years," he said. "Many fields in northwest Ohio were planted late and did not get enough growth to expect high yields."
Also, many fields have drowned-out areas, but increased nitrogen rates will not correct these problems, he said.
"Ohio State research has shown that yields are not affected by delayed nitrogen until after early stem elongation, which is generally the end of April," Lentz said. "Studies over a five-year period have shown that yields were the same or slightly better when a single application occurred at Feekes 6, which is the first node visible of early stem elongation, compared to initial green-up.
"Yields dropped 10 to 15 percent when a single application was delayed to early boot stage. At this time, we would recommend producers to apply nitrogen as soon as field conditions allow application equipment."