Effects of winter wheat N status on assimilate and N partitioning in the mechanistic agroecosystem model DAISY

• DOI: 10.1111/jac.12412
• Publication Date: 2020-05-21T05:31:09Z
• Authors: Jacob Glerup Gyld...; Per Abrahamsen; Jørgen E. Olesen; Merete Styczen; Søren Hansen; René Gislum
• Keywords: Agroecosystem; Growing season; Crop Management

Abstract Nitrogen (N) management in modern farming needs to balance the interests of yield quantity and quality with environmental impact reactive N lost atmosphere aquatic environments. Mechanistic agroecosystem models are useful tools analyse combined effects options natural conditions, including soil fertility climate, site‐specific optimal application rates impact. An important component system description is crop module, responses status stress. To improve growth response DAISY model system, we implemented an empirical for winter wheat on partitioning assimilated dry matter between leaves stems, originally described by Ratjen Kage ( Journal Agronomy Crop Science , 2016, 202, 576s). our knowledge, this mechanism has not been included any most widespread commonly used mechanistic models. We tested compared performance without new against data from a two‐season experiment Denmark, where were measured. Implementation function improved ensured more robust description, especially scenarios periods low or The mimics adaptation strategy, balances stress potential dynamically adjusting leaf‐stem ratio thereby demand. This behaviour opens discussion regarding concept biomass driven critical curve.