The sim components in the package lintul5 implement the Lintul5 algorithms from (L5). They are designed to reproduce same results (up to rounding errors) as the original FST program.
The original model is subdivided into multiple sim components (which should be used in the following order to be as close as possible to the original algorithm).
Daylength calculation is performed by the transformer component AstronomicParametersTransformer
For more information consult the sim components documentation.
In order to use the Biomass or NPK part of the model with sim components from other models, there are splitted sim components from Lintul5 in the subpackage link package_net.simplace.sim.components.models.lintul5.modular.html
(L5) Joost Wolf, User guide for LINTUL5, Wageningen UR, Wageningen, 2012