L’#agriculture du #labour, arme de destruction massive
Soil erosion and agricultural sustainability
▻http://www.pnas.org/content/104/33/13268.long
Data drawn from a global compilation of studies quantitatively confirm the long-articulated contention that erosion rates from conventionally plowed agricultural fields average 1–2 orders of magnitude greater than rates of soil production, erosion under native vegetation, and long-term geological erosion. The general equivalence of the latter indicates that, considered globally, hillslope soil production and erosion evolve to balance geologic and climate forcing, whereas conventional plow-based agriculture increases erosion rates enough to prove unsustainable. In contrast to how net soil erosion rates in conventionally plowed fields (≈1 mm/yr) can erode through a typical hillslope soil profile over time scales comparable to the longevity of major civilizations, no-till agriculture produces erosion rates much closer to soil production rates and therefore could provide a foundation for sustainable agriculture.
Érosion moyenne du sol en mm/an :
Agriculture conventionnelle : 3.939 mm/an
#Agriculture_de_conservation (non labour,...) : 0.124 mm/an
Végétation naturelle : 0.053 mm/an