Introduction to Biostimulants

Biostimulants with plant proteins have gained relevance in organic agriculture in Argentina. These natural compounds can improve the health and production of crops through physiological and biochemical mechanisms. In this article, we will explore their mechanism of action, proven benefits, and how to apply them effectively in your crops.

The growing demand for sustainable agricultural products has led to the research and development of biostimulants, which are considered a viable alternative to traditional chemical fertilizers. These products are designed to stimulate natural processes in plants, promoting healthier and more robust growth while reducing dependence on chemical inputs.

Biostimulants not only improve agricultural production but also contribute to soil health and biodiversity, crucial elements in sustainable agriculture. As farmers seek more responsible and less harmful practices for the environment, biostimulants position themselves as an effective and eco-friendly solution.

Mechanism of Action of Biostimulants

Biostimulants act at the cellular level, promoting physiological processes that enhance the growth and development of plants. Hydrolyzed plant proteins are a key component, as they provide amino acids and peptides that stimulate metabolic activity. These compounds favor nutrient assimilation, environmental stress resistance, and the activation of natural defense processes in plants.

The mechanisms of action of biostimulants are complex and multifaceted, involving molecular-level interactions that affect plant growth and health. These interactions can be direct, where biostimulants act on plant cells, or indirect, improving soil quality and nutrient availability.

Interaction with Soil and Nutrients

The application of biostimulants improves soil structure and favors beneficial microbiota, which in turn optimizes nutrient availability. This is particularly important in organic agriculture systems, where soil fertility is essential for achieving sustainable yields. A study conducted by the National Institute of Agricultural Technology (INTA) in Argentina found that the application of biostimulants increased the population of beneficial microorganisms in the soil by 25%, facilitating nutrient mineralization and availability for plants.

Moreover, it has been shown that biostimulants can reduce soil compaction, improving aeration and water retention capacity. This is crucial for the development of healthy roots, which in turn translates into better access to nutrients. A field study in Mendoza showed that the use of biostimulants resulted in a 15% increase in root growth of grape crops, contributing to improved grape production.

Biostimulants can also modify the relationship between plant roots and soil microorganisms. For example, the application of certain biostimulants has been shown to increase the symbiosis between plant roots and mycorrhizal fungi, resulting in greater absorption of nutrients such as phosphorus and nitrogen, essential for optimal plant growth.

Biochemical Mechanisms of Action

Biostimulants with hydrolyzed plant proteins act through several biochemical mechanisms that include:

• Stimulation of Hormone Synthesis: The amino acids present in hydrolyzed proteins can act as precursors to plant hormones such as auxins and cytokinins, which are crucial for cell growth and division. For example, it has been shown that the application of amino acids like glycine and proline can increase auxin production by 40% under stress conditions.
• Activation of Enzymes: These proteins can activate key enzymes in the Krebs cycle, increasing energy production in plant cells, thereby improving metabolism and photosynthesis. A study in corn crops showed a 30% increase in the activity of the enzyme phosphofructokinase, which translated into greater sugar production during photosynthesis.
• Modulation of Stress Responses: Bioactive peptides can activate signaling pathways that increase the production of secondary metabolites, which are essential for plant defense against pathogens and adverse environmental conditions. In trials conducted, it was observed that the application of biostimulants increased flavonoid production by 50%, improving resistance to diseases such as downy mildew in vegetable crops.
• Increase in Nutrient Assimilation: Biostimulants can enhance the ability of roots to absorb nutrients from the soil. This is because amino acids and peptides facilitate the formation of complexes with nutrients, making them more bioavailable. Research has shown that the application of biostimulants can increase nitrogen absorption by 20%, resulting in stronger and healthier vegetative growth.

Additionally, the interaction of biostimulants with roots can also trigger the production of root exudates, which are compounds that attract beneficial microorganisms. These microorganisms, in turn, can help the plant access nutrients that would otherwise be inaccessible, creating a positive cycle of soil fertility and health.

Benefits of Biostimulants with Plant Proteins

The benefits of using biostimulants are diverse:

• Increased Productivity: Biostimulants have been shown to improve the yield of crops such as corn, soybeans, and vegetables. Studies show increases of up to 30% in soybean yield when biostimulants are applied during flowering stages. In tomato crops, a 25% increase in fruit production was reported after the application of biostimulants during the vegetative development.
• Improvement of Crop Quality: They help obtain products with better organoleptic and nutritional characteristics. For example, it has been reported that tomatoes treated with biostimulants have a vitamin C content 15% higher than untreated ones. Similarly, in the production of vegetables such as peppers, an increase in antioxidant content was observed, improving the nutritional quality of the final product.
• Reduction of Stress: Plants treated with biostimulants show greater resistance to adverse conditions, such as droughts or diseases. In field trials, it was observed that the use of biostimulants decreased the incidence of fungal diseases by 40% in vegetable crops. Additionally, a 30% reduction in yield loss during drought periods was reported in wheat crops.
• Compatibility with Regulations: Many of these products are certified by SENASA, complying with Argentine regulations for use in organic agriculture.

Case Studies in Specific Crops

Several case studies have demonstrated the effectiveness of biostimulants in different crops. For example, in research conducted in the province of Córdoba, a plot of corn was treated with a biostimulant based on hydrolyzed plant proteins, and a 25% increase in yield was observed compared to the control plot. This result was attributed to better nitrogen assimilation and an increase in photosynthetic activity, evidenced by chlorophyll measurements.

Another notable case occurred in soybean crops in the province of Santa Fe, where a biostimulant was applied during the grain filling stage. The results showed a 20% increase in grain weight, which correlated with greater activity of the enzymes involved in protein synthesis. Additionally, an improvement in grain quality was observed, with a 10% increase in protein content.

In fruit crops, such as apple trees, a trial was conducted in the Neuquén region where biostimulants were applied during flowering. The result was a 35% increase in fruit set, attributed to improved pollination and hormonal development, evidenced by an increase in auxin production in treated flowers.

A study in onion crops in the province of Buenos Aires demonstrated that the application of biostimulants during the vegetative growth phase resulted in a 40% increase in bulb diameter and a 20% improvement in the quality of the final product, measured through firmness and soluble solids content.

Additionally, in alfalfa crops, it was observed that the use of biostimulants increased forage production by 30% compared to untreated plots. This was attributed to improved nitrogen fixation, resulting in more vigorous growth and greater biomass.

Furthermore, in rice crops in the province of Entre Ríos, the application of a biostimulant based on hydrolyzed plant proteins resulted in an 18% increase in grain yield, thanks to better absorption of water and nutrients during critical growth stages. Quality analyses of the grain also showed an increase in starch content, which is fundamental for the food industry.

Another interesting case occurred in potato crops in the Salta region. By applying a biostimulant in the early stages of growth, a 30% reduction in the incidence of pests such as the potato beetle was observed, which was associated with an increase in the production of secondary metabolites that act as natural repellents.

How to Apply Biostimulants in Organic Agriculture

The correct application of biostimulants is crucial to maximize their benefits. Here are some recommendations:

• Timing of Application: It is advisable to apply biostimulants during critical stages of crop development, such as at planting or at the beginning of flowering. A study showed that application at planting time can improve seedling emergence by 20%. In vegetable crops, application at transplanting has shown positive results, increasing seedling survival by up to 30%.
• Dose and Frequency: Doses vary according to the type of crop and the specific product. Always consult the manufacturer’s instructions. Generally, it is recommended to apply every 15-30 days. In practice, farmers have used doses of 1 to 3 liters per hectare, depending on the formulation. It is important to conduct initial tests to determine the optimal dose based on soil and crop characteristics.
• Methods of Application: You can apply biostimulants through irrigation, foliar application, or in the soil, depending on the formulation and type of crop. For example, foliar application may be more effective in vegetable crops, while drip irrigation is ideal for extensive crops like corn. In trials conducted, it has been shown that foliar application in the morning, when temperatures are cooler, maximizes absorption by the leaves.

Best Practices for Applying Biostimulants

To maximize the effectiveness of biostimulants, it is essential to follow certain recommended practices:

• Environmental Conditions: Ensure to apply biostimulants under suitable weather conditions, avoiding days of high solar radiation or heavy rains that may wash the product away before absorption. It is recommended to apply under conditions of high relative humidity, as this favors absorption by the plants.
• Compatibility with Other Products: Check the compatibility of biostimulants with other agrochemicals you use, as some combinations may reduce their effectiveness. It is recommended to conduct compatibility tests before mixing them. In trials, it has been found that combining biostimulants with certain foliar fertilizers can enhance the positive effect on plant growth.
• Monitoring Results: Keep a record of the results obtained after the application of biostimulants, such as crop yield, product quality, and disease resistance. This will allow you to adjust doses and application times in future campaigns. Additionally, monitoring parameters such as nutrient content in the soil and leaves can provide valuable information about the effectiveness of the treatment.
• Soil Assessment: Conduct soil analyses before applying biostimulants to determine its composition and specific needs. This will allow you to adjust the application to maximize the effectiveness of the biostimulant based on the soil’s nutritional deficiencies.
• Integration into an Agronomic Management Program: Biostimulants should be considered as part of a comprehensive agronomic management approach. Combining them with practices such as crop rotation, the use of cover crops, and proper irrigation management can enhance their effects and contribute to the sustainability of the agricultural system.
• Training and Education: It is essential that farmers and technicians are trained in the use of biostimulants. Conducting workshops and training on the correct application and management of these products can make a difference in the successful adoption of innovative technologies in the field.
• Research and Development: Promoting ongoing research on the effectiveness of different formulations of biostimulants and their specific applications can help improve their use in the field. Collaboration with universities and research centers can be a valuable resource for obtaining updated and relevant information.

For more information on specific products, visit our section on Ecoganic products.

Examples of Field Applications

The implementation of biostimulants in the field has proven effective under various conditions and types of crops. For example, in a field trial in the province of Tucumán, a biostimulant was applied in citrus crops. The results showed a 20% improvement in fruit production and a 15% increase in the average size of the fruits. This was attributed to better nutrient assimilation and greater disease resistance.

In sunflower crops, a study conducted in the province of Buenos Aires showed that the use of biostimulants resulted in a 25% increase in yield. Farmers who applied biostimulants during the flowering phase reported a higher number of heads per plant and an increase in seed size, which translated into a more abundant and higher quality harvest.

Additionally, in strawberry crops in the Buenos Aires region, a biostimulant application program resulted in a 30% increase in fruit production and a 20% improvement in quality, measured through sugar and acidity content. The application of biostimulants in this crop was carried out during the beginning of flowering and was complemented with proper irrigation management, optimizing the results.

These examples highlight the flexibility and effectiveness of biostimulants in different agricultural contexts, underscoring their potential to improve crop production and quality while promoting more sustainable agricultural practices.

Biostimulants with Hydrolyzed Plant Proteins: Mechanism of Action and Benefits

Biostimulants based on hydrolyzed plant proteins primarily act through the regulation of plant growth and physiology. These compounds, when applied, facilitate nutrient absorption and improve soil microbial activity, resulting in an increase in the availability of essential nutrients for plants. Studies have shown that the application of these biostimulants can increase nitrogen absorption by 20-30%.

Among the proven benefits, the improvement in resistance to abiotic stress, such as droughts or extreme temperatures, stands out. Plants treated with hydrolyzed plant proteins have shown a 15-25% increase in drought tolerance, which is critical in regions with adverse climates. Additionally, an increase in crop yield of up to 30% compared to untreated crops has been observed.

For application, it is recommended to use a dose of 1 to 3 liters per hectare, depending on the type of crop and soil conditions. It is advisable to apply the biostimulant at critical stages of plant development, such as during flowering or the onset of fruiting, to maximize its positive effects.