ISSUE 5 June 10, 2010
YIELD AND PROTEIN ENHANCEMENT IN SPRING WHEAT
Many growers are requesting information about yield and/or protein enhancement in spring wheat. Most spring wheat in the state varies from about 5-leaf to boot stages. For spring wheat stages before boot, stream-bar applications of N still have the potential to increase yield if the season allows. Stream-bar applications must have about Ĺ rain after application in one event for the N to be taken up by roots. If stream-bar applications are made and it doesnít rain, the results will be less. Once the spring wheat enters boot stage, all significant yield enhancement possibilities with more N are gone. At this stage, tillers are made, number of heads and spikelets are determined. There is nothing more that N can do in yield enhancement except perhaps increasing kernel size; but that increase is very small and probably not worth the expense by itself. Any N added at boot stage or beyond will go into producing more grain protein. Stream-bar N at boot stage can work, but it needs rain to work. A more consistent application is the post-anthesis broadcast application. Research that went into the post-anthesis broadcast application is available on my website (http://www.soilsci.ndsu.nodak.edu/Franzen/Franzen.html look at choices on left side of webpage).
The recipe is:
NDSU Extension Soil Specialist