Innovative Strategies and Machines for Physical Weed Control in Organic and Integrated Vegetable Crops

摘要

Weed control is one of the most serious problems in vegetable crops, limiting cultivated plants correct
\ndevelopment, yields, product quality and farmers income. Therefore, the aim of this work was to set up and
\nimprove innovative strategies and machines for physical (mechanical and thermal) weed control in organic or
\n“integrated” vegetables production in many important areas of Northern, Central and Southern Italy. Therefore,
\non-farm experiments were carried out since 1999 on fresh marketable spinach, processing and fresh market
\ntomato, cauliflower, savoy cabbage, greenhouse cultivated leaf beet, garlic, chicory, fennel and carrot. These
\nresearch activities started are still ongoing. The traditional farm weed management system was always
\ncompared to one or more innovative strategies that were defined according to the characteristics of the
\nenvironment (i.e. soil type and conditions, water availability, etc.), typology of cultivation, crop rotation,
\nexpected technical and economical results. The innovative strategies were the combination among preventive
\nmethods (false or stale seed-bed technique), cultural methods (i.e. crop spatial arrangement that was often
\nadjusted in order to improve operative machines effectiveness) and direct control methods (flaming, precision
\nhoeing, etc.). Different kinds of specific implement such as flex tine and rolling harrows (patented by the
\nUniversity of Pisa, patent n. PI/2004/A/000071), and flamers (designed and realized by the University of Pisa)
\nwere used to perform false or stale seed-bed technique. Precision hoes equipped with rigid tools and hoeconformed
\nrolling harrows, equipped with elastic tines for selective intra-row weed control, were used to
\nperform post emergence interventions. The use of the innovative weed management systems always resulted
\nin significant weed abundance reductions (from 70 to 100 %), relevant yield increases, high contractions of
\nmanpower requirement (from 20 to 80 %) and consequent relevant reductions of costs and increases of
\nfarmers gross incomes (from 15 to 75 %) in comparison with those obtained performing the standard systems.
\nThe results of these on-farm experiments emphasise that physical weed control can be effectively performed
\nusing the innovative machines designed and built at the University of Pisa. These machines can also be easily
\nadjusted in order to be used in other crops and agricultural contexts.
\nMoreover, the present versions of the machines, realized as “low-tech” implement in order to be available on
\nthe market at low costs, were recently modified within the RHEA Project, a 7th Framework Programme EU
\nfunded research project, in which an automatic and robotized hoeing-flaming machine able to perform VRA
\ncross flaming was designed, fully realized and tested obtaining very promising results.