Profiling: The aim is to identify soil variation and any potential physical limitations on production.
Geo-referencing of the plot: topographical elevation of the plot using GPS for future connection (association) to an integrated management system. This elevation enables a more accurate visualisation of the slope, water courses, areas of shade and drainage of the plot. This is essential for drawing up an irrigation project.
Definition of plots: in defining the plots not only should the position of electricity power lines be taken into account, but geo-referencing and profiling of the plot should also be undertaken to enable a proper evaluation.
Soil analyses: the gathering of samples is done at a depth of between 0 and 50 cm, after removal of weeds, stones and other detritus from the surface. Sub-samples are taken at random, while moving in a zigzag pattern across the plot. After the sub-samples have been mixed thoroughly around 0.5kg of earth is taken, sealed, labelled and sent to an accredited laboratory.
Irrigation project: drawing up of an irrigation project for later evaluation and installation.
Choosing vines: in our case, the grape varieties chosen were Aragonez and Trincadeira for the red wines, and Antão Vaz for the whites, because they not only form part of the Alentejo DOC varieties, but are regarded as of great potential for production of superior quality wines.
Application of limestone: this is done on controlled basis (to a width of 1 metre) going along the row with an oscillating fertilizer dispenser adapted for this task. The application of limestone is done separate from and before subsoiling, to avoid the formation of triphosphates of calcium (in their unabsorbed form) and to ensure it is well incorporated into the soil.
Subsoiling (“breaking the earth”): this is only done along the planting row with heavy machinery to a depth of ± 1 metre. It is essential to ensure that every day the soil is totally dry down to the depth you are working.
Creation of drainage ditches: this system comprises an open ditch and four “blind” ditches (1m deep, 0.7m wide, a 12cm Ø perforated drainage pipe, a layer of small clean stone up to half the depth of the ditch, geotextile felt and the rest filled in with earth).
Chisel plough: taking the chisel plough along the planting row in order to “shake up the soil”.
De-stoning: manually (medium-sized stones), or mechanically (large or small stones), the stones are removed from the soil to make future operations easier. Small stones are used in “blind” ditches.
Fertilizing the bottom: this is done in a 1-metre wide strip along the planting row with a fertilizing dispenser.
Terracing the land: this is done with a specific tool that comprises two plough bottoms mounted on a chassis.
Seeding vegetation for ground cover: we opt for a mixture of legumes and grasses (40% + 60%) thereby increasing biodiversity, the fixation and efficient use of nitrogen, and the potential production of biomass for mulching. Seeding ground cover is done with a seed drill (straight drill 2.5 metres wide) with densities of around 25 kg/ha.
Fertilising of ground cover: due to ground cover’s high demand for phosphor, superphosphate (50 kg/ha) is applied in order to improve the seeding and performance of the cover.
Marking out the vines: Points are marked out strategically every 50 metres (by a topographer) and then with the help of chains measuring 3m ×1.5m, a marker is placed in each spot where a vine will be planted.
Installation of an irrigation system: we opted for a drip-irrigation tube with holes 50cm apart and a flow of 1.6 litres/hour, giving a more homogenous water distribution.
1st mowing of ground cover: if necessary, the ground cover is mowed, to reduce as far as possible the formation of frost and eliminate the growth of resident weeds. This operation is performed with a brush shredder.
Planting: this is done using tractor-mounted water-injectors and sprayers. A rooting compound is added to the planting water. After planting, the vines are watered manually to bind the soil and the plant together better.
Placement of capacity gauges: tubes are sunk to allow access to the “Diviner” gauges in the soil placed at strategic intervals in the sub-plots, in order to monitor soil humidity and draw up a sustainable irrigation plan.
Trellising: the trellis system is comprised of metallic posts, with a leading wire placed 80 cm above ground level and two pairs of wires, the last one being 180 cm above the ground.
Pruning while green: all side shoots are eliminated, so that the best stalk can develop under the best possible conditions.
Positioning of training posts: training posts are inserted (small stakes which hold the young vines) made of bamboo 1.2 m long and ± 8 mm Ø in diameter.
Fitting of tree guards/grow tubes: the use of tree guards of between 8 and 10 cm in diameter to protect the young vines from rodents and encourage better growth.
Replanting (retrancha): this is done using pre-ordered, potted vines, so that the first year’s planting becomes as homogenous as possible. The planting procedure is identical to that described above except that the diameter of the water-injector is altered.
Irrigation: irrigation is carried out as often as required in accordance with the readings from the “diviner” gauge.
2nd mowing of ground cover: after the ground cover is mature, a second mowing is carried out to make it easier for the cover to reestablish itself the following year. This is done using a brush shredder.