DEVELOPMENT OF PLANNING MODELS - METHODOLOGICAL ASPECTS
From growth measurements functions were fitted and mean growth rates of the period from sowing or planting until harvest derived. Mean values of radiation and temperature were calculated from a climate data aquisition system with recordings in 1 minute intervals. The relation between plant growth parameters and growth factors is described by a multiplicative function.
By using an iterative procedure the crop growth duration can be estimated. Inputs are outside weather conditions, expected planting/sowing date and set point of the heating system. With an additional submodel the energy demand is calculated, too.