Effect of Biostimulants on Olive Tree Yield

Introduction

The use of biostimulants in agriculture has gained significant relevance in recent years, especially in sensitive crops such as the olive tree. These products, derived from natural sources, have the ability to improve plant performance by optimizing their health and productivity. This article focuses on the effect of biostimulants on the yield of affected olive trees, analyzing how they can contribute to more sustainable and efficient production.

What Are Biostimulants?

Biostimulants are substances or microorganisms that, when applied to plants or soil, stimulate natural processes that improve nutrient uptake, stress tolerance, and ultimately crop yield. In the case of olive trees, these products can help mitigate the negative effects of factors such as drought, diseases, and nutritional deficiencies. Additionally, research has been conducted on biostimulants in olive tree budding and water stress in olive trees, as well as a comparison of biostimulants for olive trees. For more information on the use of bioprotectors, consult our practical guide. You can also read about biostimulants for pest control in olive trees and biostimulants in olive trees. If you wish to delve deeper into the topic, check out our guide to choosing biostimulants for horticultural crops. Furthermore, biostimulants can contribute to more sustainable and efficient production.

Types of Biostimulants

There are various types of biostimulants, including:

• Seaweed extracts: Known for their ability to improve plant response to water stress. These extracts contain phytohormones such as auxins and cytokinins that regulate plant growth and development. The application of seaweed extracts has been shown to increase root production and improve photosynthesis under stress conditions.
• Beneficial microorganisms: These can help improve soil health and nutrient uptake. Mycorrhizal fungi, for example, can increase the root absorption surface area by 400%. Additionally, some microorganisms can produce metabolites that act as biostimulants, promoting growth and disease resistance.
• Bioactive compounds: They provide essential nutrients that can be used by plants more efficiently. These compounds can act as chelating agents, facilitating the availability of micronutrients in the soil. Amino acids, for instance, can enhance protein synthesis and chlorophyll formation, contributing to better photosynthesis.

Impact on Olive Tree Yield

Biostimulants have been shown to have a positive impact on the yield of affected olive trees, especially under adverse conditions. Several studies have evidenced that their application can result in:

• Increased fruit production: Olive trees treated with biostimulants often show a significant increase in the number of olives produced. For example, a study conducted in Andalusia reported a 25% increase in olive production in trees treated with a seaweed-based biostimulant. This is due to the improvement in photosynthetic activity and hormonal regulation promoted by these products.
• Better oil quality: The quality of olive oil can improve, exhibiting superior organoleptic characteristics. In a trial where biostimulants were applied, the polyphenol content in the oil increased by 15%, enhancing its flavor and antioxidant properties. Biostimulants can also influence fatty acid composition, increasing the proportion of healthy fatty acids.
• Greater disease resistance: Biostimulants can strengthen the natural defenses of plants, making them less susceptible to pests and diseases. A study showed that the use of beneficial microorganisms reduced the incidence of fungal diseases by 30%. This is because some biostimulants can induce systemic acquired resistance, a mechanism that activates the plant's defenses before pathogens appear.

Results from Recent Studies

Recent research has shown that the use of biostimulants in olive trees can result in yield increases of up to 30%, as well as improvements in oil quality. These applications have been carried out in various regions of Spain, where climatic and soil conditions can be challenging. In a study conducted in the Jaén region, it was observed that olive trees treated with biostimulants showed lower fruit drop and an increase in olive size compared to untreated controls.

Mechanisms of Action of Biostimulants

Biostimulants act through various mechanisms that improve plant physiology. One of the main mechanisms is the enhancement of root activity. Seaweed extracts, for example, can stimulate the production of secondary roots by increasing the expression of genes related to root growth. This, in turn, allows for better water and nutrient uptake. A study demonstrated that the application of seaweed extracts to olive trees increased root length by 20%.

Another important mechanism is the increase in enzymatic activity in plants. Biostimulants can activate key enzymes in plant metabolism, resulting in greater nutrient availability. A study showed that the application of an amino acid-based biostimulant increased the activity of the enzyme nitrate reductase, facilitating nitrogen uptake in olive trees. Additionally, it has been observed that biostimulants can enhance the synthesis of secondary metabolites, which are crucial for plant defense against biotic stressors.