Nitrogen tie-up a common cause of yellow wheat.

The article focuses on the existence of yellow wheat in Kansas. It mentions that nitrogen immobilization is common where less than 25 pounds per acre of fertilizer nitrogen has been applied to the wheat. In addition, immobilization of nitrogen is more likely when there are high levels of plant residue with a wide carbon-to-nitrogen ratio. Moreover, nitrogen is no longer limiting and some of it will become available to plants again through the process of mineralization.