Farmers in Croatia See Promising Use of Drones
The owners of millennial olive trees in Lun on the Croatian island of Pag are left without a harvest year after year.
Even last season, when they had high hopes, they failed to produce oil from wild olives. This year, they planned to present their extra virgin olive oil at an international competition for the first time, choosing the 2023 NYIOOC World Olive Oil Competition as the venue.
Unfortunately, they failed. “There was no fruit that was healthy enough to make at least one batch of top-quality oil,” Želimir Badurina, the founder and president of the Lun Olive Cooperative, told Olive Oil Times.
First, fertilization went wrong. Some fruits that survived the heat wave improved, but the olives turned brown over time, then black and finally fell from the branches. What little was left was damaged by pests – the olive fruit fly, borer and patula (a moth).
The problem is that protecting the Lunje olive groves against pests and diseases is not possible using conventional methods. The reason is simple: the Lunj olive groves cover about 400 hectares of rugged, hard-to-access terrain.
Most of the 80,000 trees cannot be accessed by vehicles. Even if spraying with atomizers from a tractor were possible, it would have no effect because the centuries-old trees, some of which are more than 2,000 years old, are tall with crowns of 6 to 10 meters.
Due to the slope and rocky terrain, the disposition and variable spacing of the trees, the impossibility of using tractors and the lack of workforce protection here, as in quite a few other olive growing areas, especially on the islands, is only possible from the air.
“With drones, it would be possible to effectively treat and protect the entire complex of olive groves in Lunje,” Andrea Cantore Badurina said.
The young agronomist, Badurina’s nephew, studied agronomy in Milan, where he was born. Later, he graduated from a master’s program in Zagreb and received his doctorate in Sardinia, where his parents live. After finishing his studies, he returned to Lun, where his mother is from.
Cantore Badurina works as a guide in the Gardens of Lunje olive groves, which he preserves and protects. He also does scientific work, following the latest developments in digital agriculture, especially in olive growing.
He said drones are widely used in other olive-growing countries to collect valuable data, including soil analyses, plant health indicators and water and nutrient information.
This data helps farmers optimize inputs, such as fertilizers, water and pesticides. As a result, they provide timely protection against pests, save time, reduce production costs and ensure larger and better quality crop yields.
Several other projects also are underway in neighboring Italy. For example, in Tuscany, experts are developing a model for assisted pollination of olive trees with the help of drones.
The European Union-funded project Olimpolli Montagnani is still in the experimental phase. However, the first tests carried out in olive groves in Garda and Tuscany provided encouraging results.
Instead of increasing the productivity of existing olive trees by the 1 to 3 percent associated with traditional methods, Olimpolli Montagnani’s method has increased the productivity by 20 to 25 percent.
The uncrewed aerial vehicle hovers above the olive trees, disperses the pollen and fertilizes the flowers. Days without wind and rain are ideal for pollination.
Pollen that is still active is collected directly from the plants. The olive growers can fly the drones themselves or hire specialist companies to do it for them.
The pollen can be stored and used in ideal temperature and humidity conditions the following year.
Experts said olive farmers with large groves would benefit from using drones for pollination because they can cover huge areas quickly, flying over trees even in inaccessible areas, such as steep slopes or terraces.
Even in such conditions, the drone allows farmers to apply pollen on one hectare of olive groves (ab...