Table 1. Differences in farming systems between Reference Soil Groups (RSGs) in different climate Zones of Europe (result of Chi square statistics, p ≤ 0.05).

Climate zones	RSGs	other RSGs with significantly different farming systems
1. Atlantic	Histosols:	Albeluvisols, Arenosols, Cambisols, Gleysols, Luvisols, Leptosols
	Arenosols:	Albeluvisols, Fluvisols, Histosols
2. Sub-oceanic	There is no significantly difference between any RSG
3. Northern-sub oceanic	Khastanozems:	Significantly different from all other reference soil groups
4. Mediterranean semi-arid	Acrisols:	Significantly different from all other reference soil groups
	Calcisols:	Acrisols, Regosols, Vertisols
	Fluvisols:	Acrisols, Vertisols
5. Southern sub-continental	Podzols:	Significantly different from all other reference soil groups
	Gleysols	Histosols, Leptosols, Pozols
6. Mediterranean (temperate and sub-oceanic)	Calcisols:	Fluvisols, Luvisols, Podzols
	Podzols:	Calcisols, Cambisols, Leptosols
7. Temperate mountainous	Gleysols	Significantly different from all other reference soil groups