2.2. Agricultural operations and machines
For each crop the soil was prepared with a ploughing 0.40 m
deep, a seed bed fertilization (500 kg ha1 of 8.24.24 e N, P, K) and a
secondary tillage performed with two harrowing interventions
(Tables 1e3).
Poplar cutting (0.25 m in length and 10e25 mm in diameter)
was performed in vSRC plantation, while poplar rods (1.50 m in
length and 25e45 mm in diameter) was made in SRC plantation.
Planting operations were provided with two different planters:
Allasia T2 for cuttings planting [25] and Allasia V1 for rods planting
[26].
In the maize cultivation a pneumatic seed drill with 6 seeding
elements was used.
Fertilization, weed control, insect control and irrigation, necessary
for a good biomass production [27], were carried out in each
crop.
An heavy cultivator and a disc harrow were used respectively for
the stumps removal in poplar plantations and for the maize stalks
chopping.
A chipper prototype Gandini Bio-harvester in SRC [28] and a
self-propelled harvester CLASS 850 (with a specific cutting head for
little trees) in vSRC [29] were used for the biomass harvesting. The
Class 850 harvester was also used for the maize harvesting. Two
tractors with trailers were used for the biomass transport in the
farm (about 400 m far).
The biomass harvested was measured weighing all the used
trailers, scaled on a certified weighbridge. In the meantime the
exact bulk volume was also determined after leveling the load. The
biomass produced was calculated at an annual basis, as the average
of the total harvested biomass (differently for each crop, depending
on the duration cycle) in the examined period (6 years).
2.2. Agricultural operations and machinesFor each crop the soil was prepared with a ploughing 0.40 mdeep, a seed bed fertilization (500 kg ha1 of 8.24.24 e N, P, K) and asecondary tillage performed with two harrowing interventions(Tables 1e3).Poplar cutting (0.25 m in length and 10e25 mm in diameter)was performed in vSRC plantation, while poplar rods (1.50 m inlength and 25e45 mm in diameter) was made in SRC plantation.Planting operations were provided with two different planters:Allasia T2 for cuttings planting [25] and Allasia V1 for rods planting[26].In the maize cultivation a pneumatic seed drill with 6 seedingelements was used.Fertilization, weed control, insect control and irrigation, necessaryfor a good biomass production [27], were carried out in eachcrop.An heavy cultivator and a disc harrow were used respectively forthe stumps removal in poplar plantations and for the maize stalkschopping.A chipper prototype Gandini Bio-harvester in SRC [28] and aself-propelled harvester CLASS 850 (with a specific cutting head forlittle trees) in vSRC [29] were used for the biomass harvesting. TheClass 850 harvester was also used for the maize harvesting. Twotractors with trailers were used for the biomass transport in thefarm (about 400 m far).The biomass harvested was measured weighing all the usedtrailers, scaled on a certified weighbridge. In the meantime theexact bulk volume was also determined after leveling the load. Thebiomass produced was calculated at an annual basis, as the averageof the total harvested biomass (differently for each crop, dependingon the duration cycle) in the examined period (6 years).
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