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Biodegradable mulches successfully control weeds in container-grown arborvitae
Date:11/17/2011

COMO, ITALY -- Traditionally addressed through hand-weeding and/or herbicide application, controlling weeds is one of most costly operations in nursery production. Increased labor costs have made hand-weeding prohibitive as the sole method of weed control, and although herbicides may be effective and less expensive, non-target herbicide loss can be as high as 86% and can harm the environment. To address the economic and environmental impact of weed problems, nursery producers are looking for more sustainable and cost-efficient techniques to control weeds in container-grown plants.

Building on previous research that proved that mulching materials can be successfully used as alternatives to chemical weed control, scientists in Italy evaluated the effectiveness of biodegradable mulches for weed control in container-grown 'Martin' giant arborvitae (Thuja plicata) and measured the effects of the mulches on evaporation and substrate temperature. The study premiered in a research report published in HortTechnology.

The experiments were conducted in an experimental nursery near Como, Italy. The nursery consisted of a tunnel covered with a translucent film to protect containers from precipitation. The research was performed on 2-year-old giant arborvitae plants. Four biodegradable mulching materials were tested and compared with a chemical control (oxadiazon) and a non-mulched/non-treated control. Two levels of overhead irrigation were evaluated: daily irrigation to container capacity (classified as "well-watered") and daily irrigation to 30% of container capacity (classified as "water stressed"). Plants were either hand-weeded three times during the growing season or not weeded until the end of the growing season.

According to corresponding author Gabriele Amoroso, the results showed that mulches limited weed growth to the same extent as the chemical control. In the first year of the study, mulched plants resulted in a higher shoot dry
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Contact: Michael W. Neff
mwneff@ashs.org
703-836-4606
American Society for Horticultural Science
Source:Eurekalert

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