Biostimulants for Avocado: Technical Guide by Phenological Stage
Avocado cultivation in Spain has experienced exceptional growth in recent years, especially in regions such as the Costa del Sol and the Axarquía area of Málaga. This boom is driven by the growing global demand for avocados, both in Europe and on other continents. Despite its popularity, avocado cultivation faces various agronomic challenges. These include irregular fruit set, fruit drop, water stress during summer, and deficiencies of crucial nutrients such as calcium and boron. These issues are particularly relevant in prominent growing areas like Málaga and Granada. In this context, agricultural biostimulants have emerged as an effective solution to optimize avocado production, improving both fruit quality and quantity.
Why avocado responds particularly well to biostimulants
The avocado has a simple, shallow root system that heavily depends on the fertility of the topsoil for proper development. This characteristic makes it an ideal candidate for the use of biostimulants, which can enhance the absorption of essential nutrients. During flowering, the avocado exhibits type A and B hermaphroditic flowering, where floral synchronization is key to successful fruit set. Additionally, avocado has a high demand for calcium, not only to ensure fruit firmness but also to extend its postharvest shelf life. Another important aspect is its sensitivity to irrigation water salinity, a common condition in Spanish growing areas such as Málaga. Biostimulants can mitigate the negative effects of these factors, promoting healthy avocado growth.
Complete phenological table — Ecoganic program for avocado
| Phase | Months (Northern Hemisphere) | Biostimulant Objective | Ecoganic Product | Dose L/ha | Application |
|---|---|---|---|---|---|
| Dormancy / Bud Break | January-February | Bud activation, rooting | TERRA HUMID + NITROTECH 10 | 3+4 | Fertigation |
| Bud Break / Flower Development | February-March | Vigor, pre-flowering nutrition | BOOST UNIVERSAL + BALANCE 7-7-7 | 3+5 | Foliar |
| Full Bloom | March-April | Fruit set, reduce flower abortion | PHACE + CALCIUM 40% | 3+4 | Foliar |
| Fruit Set / Small Fruit | April-May | Fruit retention, structural calcium | CALCIUM 40% + PHOSMAX 20 | 5+3 | Bi-weekly foliar |
| Fruit Growth | May-August | Size, quality, heat resistance | K-FLOW 20 + UNIVERSAL POWER | 4+2 | Monthly foliar |
| Ripening / Pre-Harvest | August-November | Oil content, firmness, shelf life | FULVEX 25L + MICRO PLUS | 3+2 | Foliar |
| Post-Harvest | November-December | Tree recovery, reserves | NITROTECH 16 + TERRA HUMID | 4+3 | Fertigation |
Main avocado problems and how biostimulants solve them
One of the most common problems in avocado cultivation is the physiological fruit drop during June and July. This issue can be mitigated by applying CALCIUM 40% together with K-FLOW 20, which provide the necessary support to keep fruit on the tree. Summer water stress is another critical challenge affecting avocados. BOOST UNIVERSAL, a product containing osmoprotective amino acids, helps plants cope with water stress, improving resistance under adverse conditions. Boron and zinc deficiencies, essential for fruit development, can be corrected with MICRO PLUS. Additionally, irrigation water salinity, a frequent problem in areas such as Málaga, can be counteracted with FULVEX 25L, a product containing chelating fulvic acids that help the plant absorb nutrients without being affected by excess salt. Finally, to address alternate bearing, the use of BALANCE 7-7-7 post-harvest balances the tree's load for the following season.
Observed Results in Axarquía (Málaga) and Costa Tropical (Granada)
In the regions of Axarquía and Costa Tropical, the application of biostimulants has shown significant results. Treated plots showed an 18% increase in kg/tree compared to untreated plots. Additionally, a 35% reduction in fruit drop was observed during the month of June. Fruit size, specifically the extra-large caliber of over 300 grams, improved its proportion by 22%. Regarding post-harvest shelf life, thanks to the use of CALCIUM 40%, it was extended by 4 days, helping to improve fruit firmness and prolong its marketability.
Certified Organic Avocado — Expanding Market
The organic avocado market continues to expand, especially in European countries such as Germany, France, the United Kingdom, and the Netherlands. The growing demand has been reflected in the interest for avocados certified under standards such as those of CAAE in Andalusia, Ecocert, and Bio Suisse. Products from the Ecoganic line are fully compliant with EU Regulation 2018/848, ensuring that cultivation follows required organic practices. This type of avocado typically achieves a price between 40% and 60% higher than conventional avocado, representing a significant economic opportunity for farmers who choose to produce under organic methods.
Avocado in LATAM — Program Adaptation
In LATAM, avocado cultivation also faces unique challenges and conditions that require adaptations to the biostimulant program. In Mexico, particularly in the state of Michoacán, the avocado cycle can be different, with the possibility of two annual harvests. In Colombia, in the Antioquia region, monsoon rains necessitate adjusting product dosages after precipitation events. Peru, with its coastal desert climate in La Libertad, uses drip irrigation, making fertigation a priority practice. In the southern hemisphere, countries such as Chile and South Africa require specific adjustments to adapt agricultural practices to their climatic cycles.
FAQ
When is the most critical time to apply biostimulants to avocado?
The most critical time is during flowering and fruit set, when crop yield is determined.
Do biostimulants help against Phytophthora cinnamomi?
While biostimulants improve overall tree health, integrated disease management is necessary for Phytophthora cinnamomi.
Can CALCIUM 40% be mixed with phytosanitary products?
In general, it is recommended to check the labels and perform compatibility tests to avoid unwanted reactions.
Does it work the same in Hass as in other varieties?
Programs may require minor adjustments depending on the variety, but in general, the principles apply to both Hass and other varieties.
How many liters per mature tree are needed?
The amount may vary depending on the tree size and the stage of the cycle, approximately 5 to 10 liters per tree distributed in applications throughout the year.
