How a sustainable olive grove works: soil, water, biodiversity and resource use
A sustainable olive grove seeks to produce olives while maintaining soil fertility, using water and energy responsibly, supporting biodiversity and making use of the residues generated during cultivation and production.
There is no single action that makes an olive grove sustainable. It is the result of many connected decisions.
Why is soil the starting point?
Soil supports the roots, stores water, provides nutrients and hosts organisms that are essential to the functioning of the crop.
It also plays a role in water regulation, nutrient cycles, carbon storage and the maintenance of biodiversity.
Agricultural soil should not be understood as an inert surface on which trees are simply placed. It is an ecosystem that can degrade, become compacted, erode or lose organic matter when it is managed incorrectly.
How is the soil in an olive grove protected?
Practices depend on the conditions of each estate, but may include:
- Maintaining ground cover.
- Reducing unnecessary tillage.
- Shredding and reusing pruning residues.
- Adding organic matter.
- Avoiding bare soil during vulnerable periods.
- Adapting machinery traffic.
- Monitoring soil compaction.
- Preventing erosion and surface runoff.
Ground cover can protect the surface from erosion, encourage water infiltration and provide shelter or food for different species. Its management should be adapted to water availability and the needs of the crop.
What does it mean to have living soil?
It means maintaining the conditions required for biological activity.
Bacteria, fungi, insects and other organisms contribute to the decomposition of organic matter and nutrient cycles. Agricultural biodiversity includes both visible species and the life that exists within the soil.
It does not mean never intervening. It means avoiding practices that unnecessarily reduce the soil’s ability to continue performing its functions.
How can water be used more efficiently?
Efficient management begins by applying the required amount at the right time.
Localised irrigation systems direct water towards the root zone and allow the amount to be controlled more accurately than less precise methods. However, technology alone does not guarantee efficiency.
The following factors must also be taken into account:
- Soil moisture.
- Evapotranspiration.
- The age and condition of the trees.
- Temperature.
- Soil type.
- Weather forecasts.
- Maintenance of pipes and drippers.
- Leak detection.
- Irrigation schedules.
Measuring conditions before watering helps replace habit with a decision based on the crop’s actual needs.
Does ground cover compete for water?
It can if it is not managed correctly.
In Mediterranean climates with dry periods, ground cover must be adapted to the available reserves and the stage of the agricultural cycle. It may be mown, shredded or managed differently depending on the season.
Sustainability does not mean applying the same formula to every estate. It means balancing soil protection, biodiversity and water availability.
What role does biodiversity play?
An olive grove forms part of an agricultural ecosystem in which trees, wild plants, microorganisms, insects, birds and other animals coexist.
European agricultural policy considers agricultural biodiversity to include wild and domesticated species, soil organisms, pollinators and landscape features.
Practices that may support it include:
- Preserving field margins and areas of vegetation.
- Avoiding indiscriminate treatments.
- Maintaining plant diversity where possible.
- Installing shelters or nesting boxes where justified.
- Respecting existing water sources and habitats.
- Reducing unnecessary night-time lighting.
- Maintaining corridors between different areas.
It is not simply a matter of filling the estate with little insect hotels and considering the job finished. Biodiversity depends on food, shelter, continuity and consistent management.
Is an organic olive grove necessarily sustainable?
Organic certification provides an important foundation because it regulates production practices and restricts the use of certain substances.
However, sustainability may include other aspects: energy efficiency, water consumption, the recovery of residues, working conditions, proximity, economic viability and packaging design.
It is therefore useful to distinguish between a specific certification and a broader assessment of the entire system.
What happens to pruning residues?
The branches and leaves generated during pruning no longer have to be treated as a problem when they are managed as a resource.
Under certain conditions, they may be shredded and incorporated into the soil, used as ground cover or allocated to other authorised uses.
The decision should consider plant health, fire risk, the characteristics of the material and the needs of the land. Not all residues should be managed in the same way.
What by-products does an olive mill generate?
Processing olives produces oil, but also stones, pulp, water and other materials derived from the process.
Circular management seeks to find suitable uses for these by-products instead of always treating them as materials without value.
Olive stones can be used as biomass. Organic residues may have agricultural or industrial applications when they meet the relevant technical and legal conditions.
The European and Spanish waste hierarchy prioritises prevention, reuse, recycling and other forms of recovery over disposal.
How does energy affect the system?
Agriculture consumes energy through water pumping, machinery, harvesting, transport, olive milling, climate control and packaging.
A sustainable system can work on two fronts:
- Reducing unnecessary consumption.
- Replacing part of the energy with renewable sources or the estate’s own by-products.
Energy efficiency does not only involve installing technology. It also means maintaining equipment, organising processes more effectively and avoiding consumption when it adds no value.
How is the sustainability of an olive grove measured?
It is advisable to use indicators that can be compared over time:
- Water consumption per harvest season.
- Energy consumption.
- Area covered by vegetation.
- Organic matter in the soil.
- Losses or leaks.
- Amount of recovered by-products.
- Use of treatments.
- Crop yield.
- Erosion.
- Observed biodiversity.
- Waste generated.
- Emissions associated with particular operations.
Without measurement, it is easy to confuse a visible initiative with a meaningful improvement.
Sustaining means being able to continue
A sustainable olive grove must continue producing without exhausting the resources that make production possible.
This requires fertile soil, well-managed water, functional biodiversity, carefully used energy and an economically viable agricultural operation.
In the next article, we examine how this approach is applied from the olive grove to the olive mill.
Son Mesquidassa explains in its A Sea of Sustainability section that it recovers the stones from processed olives and uses them as biofuel to generate heating and cooling for its facilities.
Frequently asked questions
What is ground cover in an olive grove?
It is the vegetation maintained or established between the rows of trees. It can help protect the soil and support biodiversity, but it must be managed according to the climate and water availability.
Do olive trees need a lot of water?
Their needs depend on the cultivation system, age, soil, climate and desired yield. Irrigation should be adjusted according to real data rather than applied automatically.
What are the benefits of shredding pruning residues?
It can reduce the loss of organic matter from the estate and help protect or enrich the soil when the material is suitable and managed correctly.
What is waste recovery?
It is the use of discarded materials to obtain products, raw materials or energy, avoiding direct disposal whenever possible.
Why is biodiversity important in agriculture?
Because soil organisms, pollinators, natural predators and landscape features contribute to the functioning and resilience of the agricultural ecosystem.