Recovering Kiwifruit pruning residues for biomass production
Spinelli, R.; Spinelli, R.; Magagnotti N.; Nati, C.; Pari, L.; Vanneste, J. L.
Transactions of the ASABE
|Kind of publication:|
American Society of Agricultural Biological Engineers
|Abstract in Italian:|
|Abstract in English:|
Three systems for recovering kiwifruit pruning residues were compared for their cost-effectiveness. The systems
were a shredder with a built]in dumping container; a shredder with drop-down re-usable bins, of the type normally used for
fruit collection, working with a dedicated bin]collection system; and a round baler equipped with an add-on bale storage unit.
All systems were light enough to be towed or carried behind a compact vineyard tractor. Harvesting and processing
productivity, including all delays, ranged from 1.8 to 3.7 tonnes per scheduled machine hour (SMH). After standardization,
calculated recovery cost varied between 8.4 and 28.6 Euros t-1 for the residue delivered at the field edge. The shredder with
a built]in dumping container emerged as the best performer, favored because of a faster pick]up and a more efficient
single]pass work mode. Overall, this system is simpler, more productive, and offers the lowest processing cost. The annual
utilization of all the dedicated recovery implements tested should at least be 50 ha year]1 (approx. 500 t year-1) in order to
obtain acceptable cost results. Kiwifruit orchards offer a very high residue yield, about four times higher than vineyards and
olive tree groves. This favors cost]effective recovery and makes them a significant potential source of energy biomass, the
exploitation of which may also simplify residue management and improve plant health conditions.