Plant Biostimulants | Best Guide

Plant Biostimulants are a group of substances increasingly being studied for their potential to boost crop productivity and improve plant health. These naturally occurring compounds, made up of various organic and inorganic substances, can be applied to plants in low concentrations to stimulate growth and development, enhance nutrient uptake, increase stress tolerance, and improve overall crop performance.

As the world population continues to grow rapidly, there is an urgent need for sustainable solutions that will help feed a growing population without putting undue strain on the environment. It offers a promising avenue for achieving this goal by providing farmers with an effective tool for improving yield without relying solely on synthetic fertilizers or chemical pesticides.

What are Plant Biostimulants?

Plant growth is influenced by several factors that work together to support the health of plants. One such factor is root growth, which is crucial in providing stability and nutrients to the plant. Roots grow vertically and horizontally, helping plants reach water and nutrients deep within the soil. The diameter of sources also impacts plant growth as more expansive roots are better equipped to absorb more nutrients and water from the soil.

The factor that influences plant growth is the capacity of soil to hold water. Plants require adequate moisture levels for optimal growth, and soil with good water-holding capacity ensures enough moisture is available even during dry periods. Increased microbial activity in the soil can play a significant role in promoting healthy plant growth by breaking down organic matter into essential nutrients that plants can absorb.

One way of enhancing these factors that influence plant growth is through biostimulants. Plant biostimulants are a type of substance that can be used to enhance plant growth. They come in many different forms, including natural and synthetic compounds, which can be applied directly to the soil or sprayed onto the leaves of plants. Biostimulants aim to provide plants with a more favorable environment for growth by improving nutrient uptake, stimulating root development, and increasing stress resistance.

It can help farmers reduce their reliance on chemical inputs such as pesticides and synthetic fertilizers. Biostimulants can promote crop growth in challenging conditions like drought or extreme temperatures. This makes them particularly useful for farmers operating in regions with unpredictable weather patterns or limited access to water resources.

Use of Plant Biostimulants

Fertilizers and pesticides have been essential tools for agriculture for decades. They are used to increase yield and ensure a constant supply of produce. Fertilizers give plants nutrients, while pesticides protect crops from pests and diseases.

These traditional farming methods have come under scrutiny due to their negative environmental impact. The excessive use of fertilizers can lead to soil degradation and water pollution, while pesticides can harm beneficial insects such as bees and butterflies, which are crucial for pollination.

Farmers are using alternative methods, such as plant biostimulants, to address these issues. Unlike fertilizers, they don’t contain nutrients but instead work by amplifying natural plant processes. Some plant biostimulant sources include seaweed extracts, humic acids, beneficial bacteria, and fungi.

They work by promoting soil health and encouraging the growth of beneficial microbes that help plants absorb nutrients more efficiently. Reducing the need for synthetic fertilizers and pesticides, biostimulants have a positive impact on the environment. Studies have shown that these stimulants can significantly boost crop yields while reducing farming costs.

Components of Plant Biostimulants

Plant Biostimulants

Hydrolysates of proteins.

Hydrolysates of proteins are gaining popularity in the agricultural industry as a component of plant biostimulants. These hydrolysates are obtained through enzymatic or acid hydrolysis of protein sources such as animal by-products, fish waste, and plant materials. The resulting mixture contains amino acids, peptides, and small molecular weight proteins that can be used to improve plant growth and yield.

They offer numerous advantages when utilized in plant biostimulants. These benefits encompass amplified nutrient absorption, enhanced growth of roots, augmented resilience against stress, and superior quality of crops. Amino acids in the hydrolysate act as building blocks for new protein synthesis, while peptides can stimulate hormone production in plants leading to better growth and flowering. These components can improve soil fertility by increasing microbial activity and promoting nutrient cycling.

Seaweed and extracts of plants.

Seaweed and extracts of plants are among the most commonly used components in plant biostimulants. These natural substances effectively enhance plants’ growth, health, and productivity. Seaweed extracts contain various plant hormones, trace elements, amino acids, and other organic compounds that can stimulate plant growth and development.

They have been used for centuries for nutrition and medicinal properties. Seaweeds are rich in vitamins, minerals, and antioxidants that can help fight against diseases. These marine algae are also known for their anti-inflammatory and antibacterial properties, making them ideal for topical treatments.

Extracts from aloe vera, chamomile, and lavender have been widely used in skincare products due to their soothing properties. Aloe vera reduces inflammation and hydrates the skin, while chamomile soothes irritated skin. The lavender extract has antiseptic properties that can help heal wounds faster. The combination of seaweed and plant extracts is becoming increasingly popular in the beauty industry due to its ability to provide numerous benefits for the skin without any harmful side effects.

Humic acids

These substances are naturally occurring organic compounds that have been found to have numerous benefits for plants. They are extracted from natural sources such as peat, coal, and lignite. Humic acids are large molecules with a high molecular weight. They comprise various organic molecules such as phenolic, sugars, and amino acids.

These substances help improve soil structure by promoting the growth of beneficial microorganisms that aid in nutrient cycling. They improve water retention in soils by increasing the cation exchange capacity of soils which aids in holding onto nutrients plants need.

Fulvic acid

Fulvic acid is a low molecular weight substance easily absorbed by plant roots. It contains various minerals and trace elements needed for plant growth, such as iron, zinc, and manganese. Various beneficial microbes. Different beneficial microbes play a vital role in the development of plant biostimulants. These microorganisms are essential in plant growth-promoting rhizobacteria (PGPR) and biofertilizers. Using these microbes in agriculture has proven to be highly advantageous for promoting plant health, increasing yields, and improving soil quality.

The benefit of using various beneficial microbes in plant biostimulants is their ability to fix nitrogen. Nitrogen fixation is one of the crucial processes that plants rely on for growth, but it’s often limited by soil nutrient availability. By introducing nitrogen-fixing bacteria into the soil or directly onto roots, we can increase the amount of available nitrogen for plants. Some microorganisms, such as mycorrhizal, provide additional nutrients like phosphorus and potassium, essential for overall plant health.

Chitosan and biopolymers.

These substances are increasingly used in the agricultural industry as an eco-friendly alternative to traditional fertilizers. Chitosan, a chitin derivative extracted from crab shells, is known for its unique properties that improve soil quality and plant growth.

Biopolymers such as cellulose, starch, and pectin are also gaining popularity as plant biostimulants because they enhance nutrient uptake and promote root growth. These substances can be derived from various natural sources such as plants, animals, and microorganisms.

Chitosan and biopolymers are natural polymers that have gained the attention of farmers for their many benefits in agriculture. These biodegradable materials offer a sustainable solution to chemical fertilizers, pesticides, and other synthetic products that harm the environment and human health.

The agricultural sector always looks for innovative ways to improve crop yields, reduce waste, and minimize environmental impact. Chitosan and biopolymers benefit by enhancing soil fertility, plant growth, disease resistance, water retention capacity, and nutrient uptake efficiency.

The benefit of using chitosan in agriculture is its ability to boost soil fertility by increasing microbial activity. This natural polymer acts as a bio-stimulant that enhances root development and increases nutrient availability in the soil. It also helps to retain moisture in the soil, which reduces water usage during irrigation.

Types of Plant Biostimulants – Microbial and Non-Microbial

Plant Biostimulants

Biostimulants are classified into two major categories: microbial and non-microbial. Microbial plant biostimulants have emerged as a promising tool for enhancing agricultural productivity and sustainability. These products are based on the use of beneficial microorganisms that can improve plant growth. The organisms used in these products include bacteria, fungi, yeasts, and other microbes that interact with plants in various ways.

The benefit of microbial plant biostimulants is their ability to promote root development and increase nutrient availability. Some microbial strains can produce enzymes or organic acids that solubilize phosphate or other nutrients in the soil, making them more accessible to plants. Other microbes can fix nitrogen from the air or scavenge nutrients otherwise lost through leaching or volatilization. By enhancing nutrient uptake efficiency, microbial biostimulants can reduce fertilizer inputs and improve crop yields while reducing environmental impacts.

Non-microbial plant biostimulants are a new and exciting field of research that offers the promise of improved crop yields without the use of harmful chemicals or synthetic fertilizers. These products stimulate plant growth naturally, enhance nutrient uptake, and boost overall health. Non-microbial plant biostimulants have gained popularity in recent years as farmers and consumers alike become more aware of the dangers associated with chemical-based agricultural practices.

The most promising type of non-microbial plant biostimulants is seaweed extracts. These extracts contain a wide range of beneficial nutrients such as vitamins, minerals, and amino acids which help plants to grow stronger roots, more robust stems, and healthier foliage. Seaweed extracts can also improve soil structure by increasing its water-holding capacity, making it easier for crops to absorb moisture during drought or low rainfall.

Plant Biostimulants Products

Look up the ingredients list.

When selecting plant biostimulants products, the ingredients list is of utmost importance. As a conscious consumer, you need to be aware of what goes into the product you use on your plants. The ingredients list can provide valuable insights into whether or not a particular biostimulant product suits your needs.

Ensure that the product contains organic and natural ingredients instead of synthetic compounds. This is because organic and natural ingredients are eco-friendly and avoid environmental damage. Look for specific nutrients your plants require, such as nitrogen, phosphorus, and potassium (NPK). These essential macro-nutrients help in promoting the healthy growth and development of plants. Some products may contain secondary nutrients like calcium or magnesium, which are essential to plant health.

Select a product that a third party has evaluated.

When selecting plant biostimulant products, choosing one a third party has evaluated is crucial. This means that the product has undergone thorough testing and analysis, ensuring that it meets the highest standards of quality and effectiveness. By selecting a product that a third party has evaluated, consumers can have confidence in their purchase and trust that they are getting what they need to promote healthy plant growth.

The benefit of choosing a third-party evaluated product is the assurance of its safety and efficacy. Third-party evaluation ensures that all claims made by manufacturers about their products are backed up by independent research and testing. These evaluations also help identify any potential risks or side effects associated with using certain biostimulant products on plants. Ultimately, this allows consumers to make more informed decisions when selecting biostimulant products for their plants.

Find relevance during testing.

Finding relevance during testing is essential when searching for the perfect plant biostimulant product. Understanding how a product is tested and evaluated can help you make informed decisions about which products are best suited for your needs.

Look for products that have been extensively tested in field trials. These trials should be carried out under conditions similar to where you will use the product. This ensures the results are relevant to your situation and indicate the product’s effectiveness.

Pay attention to the metrics used to evaluate each product during testing. This could include yield, plant growth rate, or nutrient uptake efficiency measurements. By understanding these metrics, you can better assess whether a product will meet your needs and deliver the desired results.

Biostimulants Reduce the Requirement for Fertilizers

When used effectively, they can reduce the need for chemical fertilizers by improving soil structure, enhancing microbial activity, and increasing nutrient availability. These benefits lead to healthier plants and help preserve the environment by reducing the overall use of chemicals in agriculture.

One way biostimulants work is by promoting the growth of beneficial microorganisms in the soil. These microbes can break down organic matter into nutrients that plants can absorb more easily. Biostimulants may contain compounds that increase root development and improve soil structure, allowing better water retention and drainage. This results in a healthier root system and greater access to nutrients.

By reducing the need for chemical fertilizers, biostimulants offer an eco-friendly alternative for farmers looking to increase crop yields while minimizing their environmental impact.

Outlook and Challenges Ahead

The plant biostimulant market is rapidly growing, and the future looks promising. Biostimulants enhance plant growth and health by stimulating biological processes in the plant. They represent a sustainable solution to improve crop yields and reduce the use of chemical fertilizers. The global biostimulant market was valued at $2.6 billion in 2020 and is projected to reach $5.9 billion by 2025, with a compound annual growth rate (CAGR) of 12%.

Despite its potential, the biostimulant industry faces several challenges ahead. One major challenge is the lack of standardized regulations across different countries, which hinders product development and international trade. Another challenge is the need for more scientific research to support claims made by biostimulant manufacturers regarding their products’ efficacy and safety.


As we face the challenges of feeding a growing population while preserving our natural resources, biostimulants can play an essential role in sustainable agriculture. More research is needed to optimize their use and ensure their safety for human health and the environment. We need to invest in science-based innovation and education to unlock the full potential of biostimulants and support resilient farming systems. Let’s work together towards a future where biostimulants are widely adopted as part of our agricultural practices for a healthier planet and thriving communities.

Frequently Asked Questions

What are plant biostimulants used for?

They have many potential applications, including increasing crop yields, improving water usage efficiency, controlling pests and diseases, and enhancing environmental sustainability. Some of the most common uses include improving crop growth and yield, reducing water usage in agriculture, controlling pests and diseases in plants, and enhancing environmental sustainability.

Maria Khan