Sustainability of Machinery Traffic in Vineyard

Viticulture involves significant levels of machinery traffic, causing heavy soil compaction. In particular, the compaction of the subsoil is increased; a deep tillage could certainly solve the problem, but the risk of damage to the plants’ root system is high. The aim of this study was to investigate the trend of both the top- and the sub-soil compaction in a hillside vineyard located in Tuscany (Italy), investigating different machine-implement combinations, i.e., self-propelled machinery or narrow tractor coupled to implements. The tests were repeated periodically along the entire growing season, approximately every 6–8 weeks (end of May, end of July and first decade of October). A single test included at least 50 sample measurements, recorded randomly along each inter-row investigated. In the surveyed field, the inter-rows were alternatively covered with grass, or tilled in the top layer during the previous wintertime. Two experimental test sets were developed: the first involved the use of two implements (a sprayer and a grape harvester) towed by narrow tractors, while in the second the pesticide distribution and the harvesting were performed with a properly equipped self-propelled tool carrier. All the other farming operations were executed using the same implements in both cases. Balanced use of the self-propelled tool carrier and the traditional tractor-implement combination allows a better distribution of the soil compaction (in particular in the top-soil), thus improving the root-growing efficiency.