Étude de l’impact des Techniques culturales de Conservation des Sols sur la qualité agro-environnementale des sols (incluant propriétés biologiques, physiques et chimiques) en contexte agricole breton, et de la durabilité de tels agrosystèmes

Abstract : While no-tilling farming techniques are growing in Europe, their impacts on soil agro-environmental quality is still controversial. It is a question of understanding how direct seeding systems can affect biological, chemical and physical parameters and then improves or not soil quality. This study focuses on the comparison between direct seeding wheat plots and tilled wheat plots in a field network built in this purpose in Ille-et-Vilaine. The results highlight that direct seeding systems positively impact microbial biomass, abundance, diversity and earthworm’s biomass, anecic abundance, nitrogen and carbon rates in the first 10 centimeters of soil. Direct seeding system also improves soil stability and reduces run-off and erosion risks. Direct seeding system doesn’t affect water infiltration speed but disfavors hydraulic conductivities, even if they are fostered by carbon rate and anecic abundance. The analyses of parameters interactions highlight positive impacts between biological (hypha, anecics microbial biomass) chemical and physical parameters. This being so, wheat yields obtained in no-tilled plots are not lower than those in tilled plots. As a conclusion, agro-environmental soil quality is globally improved in direct seeding systems.
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Master Thesis
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Cécile Richard. Étude de l’impact des Techniques culturales de Conservation des Sols sur la qualité agro-environnementale des sols (incluant propriétés biologiques, physiques et chimiques) en contexte agricole breton, et de la durabilité de tels agrosystèmes. Sciences du Vivant [q-bio]. 2018. ⟨dumas-01972185⟩

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