Comparaison de cultures intercalaires pour la répression des adventices et la stabilité des agrégats du sol dans la vigne semi-rustique en implantation au Québec

Authors: Minville, Audrey-Kim
Advisor: Halde, Caroline; Simard, Marie-Josée
Abstract: Non-hardy grapevine varieties require winter protection in southern Quebec because temperature can drop to –35 °C and cause irreversible frost damage. Winter protection is provided either by geotextiles or hilling, the latter generating intensive soil disturbance twice a year. These constraints limit the adoption of intercrops because 1) their establishment and growth are concurrent with the crop, 2) hilling destroys intercrops every fall, and 3) the use of geotextiles allows the adoption of perennial intercrops but is more expensive. Although it can control weeds and mitigate soil erosion, intercropping in Quebec vineyards is limited. Moreover, grapevine response to intercropping is poorly documented under Quebec's continental climate. A randomized complete block design experiment was conducted (2018-2020) to compare mechanical weeding to two grass mixture intercrops (annual vs perennial), during vineyard establishment. Variables tested included weed control and diversity, soil aggregate stability, vine growth, and grape yield. A weedy control was also included. Cultivation was more efficient at controlling weeds than both intercrops but decreased plant species richness and diversity in comparison to other treatments. Weed density did not decrease over time and weed cover was relatively high (> 50% at the end of the growing season) under intercrops. Nevertheless, weed shoot biomass was lower under intercrops than in the weedy control during the first two years. Cultivation was also detrimental to soil structure, it showed lower aggregate stability compared to vegetated treatments by the end of the season. None of the interrow management methods had an impact on vine yield fruit quality.
Document Type: Mémoire de maîtrise
Issue Date: 2021
Open Access Date: 13 September 2021
Grantor: Université Laval
Collection:Thèses et mémoires

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