Introduction

The choice between biostimulants and fertilizers is fundamental in modern agriculture. Biostimulants are products that enhance nutrient absorption efficiency and stress resistance in plants, while fertilizers provide essential nutrients for growth. Both have specific roles, and understanding their differences is crucial for optimizing agricultural production.

Key Differences

Composition

Biostimulants are composed of natural extracts, beneficial microorganisms, and bioactive compounds, while fertilizers are chemical formulations that provide nutrients such as nitrogen, phosphorus, and potassium. This difference in composition implies that each acts differently in the agricultural system.

Biostimulants may include substances like humic acids, amino acids, and seaweed extracts, which provide not only nutrients but also compounds that stimulate physiological processes in plants. For example, fulvic acid, a component of humic acids, can enhance the roots’ ability to absorb nutrients and water. In contrast, fertilizers like ammonium nitrate or triple superphosphate are direct sources of nutrients that need to be assimilated by plants to be effective.

Mechanism of Action

Biostimulants work by improving soil microbiota and promoting root development, allowing for better nutrient assimilation. On the other hand, fertilizers provide readily available nutrients, promoting faster growth but without the additional benefits that biostimulants offer.

The mechanism of action of biostimulants is based on biochemical processes such as the activation of enzymes that facilitate nutrient absorption in the roots. For example, some studies have shown that the application of biostimulants can increase the activity of the enzyme nitrate reductase in the roots, thus improving the utilization of available nitrogen in the soil. In comparison, fertilizers, being an immediate source of nutrients, can lead to rapid plant growth, but this can often increase susceptibility to diseases and environmental stress.

Regulation and Standards

In Argentina, biostimulant products must comply with SENASA regulations, ensuring their effectiveness and safety for the environment. Fertilizers, while also regulated, usually have different regulations, focusing more on nutrient concentration.

The regulation of biostimulants is a complex process, as many of these products may be considered additives or biopesticides, which means they must undergo a rigorous evaluation process to ensure they are not only effective but also safe for the environment and human health. For example, the classification of a product as a biostimulant may depend on its origin, mode of action, and results from efficacy studies. This contrasts with fertilizers, which are generally evaluated primarily for their nutrient content and their ability to improve crop yield.

Environmental Impact

Biostimulants are generally considered more sustainable, as they not only nourish plants but also improve soil health. Fertilizers, if used excessively, can cause water pollution and soil degradation.

A study conducted by the University of Buenos Aires demonstrated that the application of biostimulants could reduce the need for chemical fertilizers by 30%, thus decreasing the possibility of nutrient leaching into nearby water bodies. Additionally, biostimulants can help restore soil biodiversity, promoting the activity of beneficial microorganisms that are essential for the health of the agricultural ecosystem. In contrast, excessive use of fertilizers can lead to the eutrophication of lakes and rivers, resulting in the death of fish and other aquatic organisms.

Advantages of Each

Biostimulants

• Improvement of Nutritional Efficiency: Increase nutrient absorption.
• Stress Resistance: Help plants tolerate adverse conditions.
• Sustainability: Promote a more ecological agricultural approach.
• Improvement of Soil Quality: Foster microbial biodiversity and improve soil structure.
• Reduction of Chemical Inputs: Can decrease reliance on chemical fertilizers, promoting more sustainable practices.

Fertilizers

• Rapid Growth: Provide immediate nutrients.
• Easy Application: Generally simpler to apply over large areas.
• Quick Results: Improve crop yield in the short term.
• Predictable Costs: Allow farmers to easily calculate cost per hectare and expected yield.
• Availability: Widely available and often more accessible than biostimulants in the short term.

When to Use Biostimulants and Fertilizers

The decision to use biostimulants or fertilizers depends on the specific needs of the crop and soil conditions. Biostimulants are ideal in situations of water or saline stress, or when seeking to improve soil health. In contrast, fertilizers are more suitable when an immediate increase in crop nutrition is required.

For example, in corn crops experiencing drought stress, the application of biostimulants like seaweed extracts can help plants retain water and nutrients, improving production under adverse conditions. Conversely, in a wheat crop showing nitrogen deficiency, the application of a nitrogen fertilizer can result in a significant yield increase in a short period of time. Additionally, in soils with low organic matter, the use of biostimulants can improve soil structure and promote microbial activity, which will benefit crop health in the long term.

Our Experience

At Ecoganic, we have worked on various projects since 2015 in Argentina, optimizing the use of biostimulants in soybean and corn crops. Our results show that the incorporation of biostimulants increases productivity by 15-20%, especially under stress conditions.

For example, in a trial conducted in Buenos Aires, we applied an amino acid-based biostimulant to a soybean field that had been affected by drought. The results showed an 18% increase in yield compared to crops that only received chemical fertilizers. Additionally, soil analyses after harvest indicated an improvement in the microbiological composition of the soil, suggesting long-term benefits for soil health.