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[[File:8.5_Recolte_des_betteraves_fin_du_XIXe_siecle._Huile_d’Emile_Claus.png|center|600px|Récolte des betteraves, fin du XIXe siècle. Huile d’Émile Claus. Fuente: ''Émile Claus (1849-1924)''. Paris: Bibliothèque de l Image, 2013, p. 35.]]
This know-how came from the deep-rooted link that was established with the land. In the case of an economy based on self-sufficiency, there was no other option than to respect the land, as their very livelihood depended on it. In fact, unlike what happens today with agricultural fields, exposed to erosion and to the buildup of chemical waste, arable land in the past gradually improved with years of work and the best land was considered to be that which had been ploughed for generations.