Know more

figure1 doc - 223.5 kB	figure2 doc - 41 kB
See figure 1	See figure 2

A generic structure regardless of the crop and the pest has been developed .
Figure 1 represents this generic structure IPSIM for a single pest. The underlying assumption is that a biotic pressure is completely determined by the cropping system (to a multi-year scale), weather and soil, and field environment . Then, each of these three attributes is decomposed into different attributes, themselves broken down into other attributes described at a lower level until the basic attributes or inputs of the model (tree structure).
The basic attributes are variables which allow to calculate superior variables by using an aggregation function of  "If…Then …"type. The aggregation functions are presented in the form of tables and basic attributes are described in a qualitative manner (nominal variables or ordinal) or quantitative (variables intervals). The value of an aggregated attribute is determined by the values of the attributes in the lower level in tables of aggregation such as those listed below (Figure 2) in the case of the eyespot of winter wheat (Robin et al, 2013). The set of tables of aggregation is available on the page "Application for different pests ".
Figure 1. Generic structure of a module of IPSIM. The attributes in bold and non-bold represent respectively the aggregated attributes and the basic attributes.
Figure 2. Example of aggregation Table used in the model IPSIM-Wheat-Eyespot (Robin et al, 2013). The leve of mitigation through crop status is determined by the cultivar susceptibility. The level of nitrogen availability and the sowing rate are listed in this table in order to be consistent with the structure of other modules of the model IPSIM-wheat.