THÈSE - Université de Franche-Comté

Table 1. Description of the 13 farming practices variables recorded for each parcel (n = 46) as
the practice before an A. terrestris population cycle.
Variables Description
Ploughing Number of ploughings from 1992 to 2002
Yield
Cutting Number of annual cuttings
Forage yield of the first annual cutting (tons of dry matter per
ha)
Grazing Number of cattle per ha × number of grazed days per year
Grazing in spring (spgraz) Presence or absence of spring grazing
Grazing in summer (sumgraz) Presence or absence of summer grazing
Grazing in autumn (autgraz) Presence or absence of autumn grazing
Mineral nitrogen (minen) Number of nitrogen units (per ha and per year)
Organic nitrogen (organ)
Number of nitrogen units from organic enriching agents (per ha
and per year)
Nitrogen fertilisation (nfertil) Total number of nitrogen units (per ha and per year)
Mineral potassium (k) Number of potassium units (per ha and per year)
Mineral phosphorus (p) Number of phosphorus units (per ha and per year)
Rodenticide (broma) Presence or absence of annual chemical treatment
Thèse C. Morilhat 2005 116