An increasing number of researches has been carried out dealing with long term experiments (LTEs) with the aim of evaluating the effects of organic and conventional cropping systems on crop productivity and soil fertility management. These LTEs are often based on specialized cropping systems as they include only field crops or only vegetable crops. This is due to the peculiarity of farm machineries, farmer competences, and the needs of the market chains, that all push towards an intense specialization within only field crops or only vegetables. However, considering the base agroecological principles, a high diversity of crop species, including both field crops and vegetables is expected to be more rational and sustainable, especially in the case of an organic farm management. Several LTEs have been designed and set up with the inclusion of both field crops and vegetable species (as pure crops or intercrops) and with cover/green manure crops in the crop rotation. This contribution reports evidences on crop productivity and soil fertility from the BIOSYST LTE, which has been running for 20 years at the Field Lab of the DSA3.
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