Using split fertilization of nitrogen (N) in wheat production is today well-established to increase protein content and adjust fertilization. However, deep knowledge and understanding of N uptake and remobilization during late stages of crop development are missing. Moreover, while split fertilization requires fast dissolution of fertilizers, information on amount of precipitation/moisture needed is currently lacking. The project will, by pot- and field trials as well as a lab-study, explore the following principal questions: How late can N be applied and still result in increased yields or higher protein content in wheat? Can nitrogen use efficiency increase by late N application? How much precipitation/moisture is needed to dissolve different fertilizers? New knowledge can be implemented in practical farming. Information on dissolution of fertilizers can result in more precise N-doses and increased knowledge regarding crop potential can improve profitability in production.