Étude de l’effet d’un désherbage mécanique précoce sur la flore adventice dans un réseau de parcelles en système céréalier agrobiologique

Abstract : One of the main obstacles faced in organic agriculture is weed management. In the absence of chemical herbicide, other agronomical or mechanical solutions must be found. Among the existing methods, mechanical weeding post-seedling is a so-called healing solution. The trial set up on 41 plots of the 4 departments of Poitou-Charentes is intended to test the effectiveness of such weeding on winter cereals in organic systems. For that two floristic surveys have been made as well as interviews with farmers. Crops were also harvest on 23 plots. The results showed an average efficiency of about 20% for this early weeding. Conditions of tillage during the Autumn were not favourable to greater efficiency which may be increased to 60% in some plots. The effect of the early weeding has been most significant on the density of weeds rather than on crops yield. Correlations have also been established between some elements of the technical arrangement and weed density. The levers to put in place to limit the weed pressure include : more than two stubble ploughing and false seed-bed in intercrop, avoid plough annually and use the harrow several times during cultivation. This test should be conducted in other years to estimate efficiency of the early weeding again and see the influence of weather conditions on early weeding.
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Master Thesis
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Marine Pellentz. Étude de l’effet d’un désherbage mécanique précoce sur la flore adventice dans un réseau de parcelles en système céréalier agrobiologique. Sciences du Vivant [q-bio]. 2018. ⟨dumas-01971991⟩

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