What is a biostimulant? Meaning, types and uses
A plain explanation of biostimulants: what they are, the main types, how they differ from fertilizers, and how they are regulated in India.
Biostimulant meaning
A fertilizer feeds the crop: it supplies nitrogen, phosphorus, potassium or other nutrients. A biostimulant helps the crop use what it has: it supports root growth, nutrient uptake and the plant's response to heat, drought, salinity or transplanting shock. Many programmes use both.
Main types of biostimulants
| Type | What it is | Typical role |
|---|---|---|
| Humic and fulvic acids | Stable fraction of decomposed organic matter | Soil conditioning, nutrient holding, roots |
| Seaweed extracts | Concentrates of marine algae | Stress tolerance, flowering and fruit set |
| Protein hydrolysates and amino acids | Broken-down plant or animal proteins | Recovery after stress, growth |
| Botanical extracts | Extracts of specific plants | Varies by plant |
| Beneficial micro-organisms | Live microbes other than biofertilisers | Root zone activity |
How biostimulants work
Biostimulants act on plant physiology rather than supplying nutrients in bulk. Humic substances improve the soil environment around roots; seaweed extracts carry compounds that influence growth and stress responses; amino acids are building blocks the plant can use directly instead of making them, which saves energy under stress.
How biostimulants are regulated in India
Biostimulants are regulated under Schedule VI of the Fertiliser Control Order. Since June 2025, only biostimulants specified in Schedule VI can be sold. See our Schedule VI guide.
How to use biostimulants well
- Match the product to a problem: soil, stress, flowering, recovery
- Apply at the right stage, before stress where you can
- Keep your normal fertilizer programme; biostimulants do not replace it
- Run a trial strip and compare before scaling up
Frequently asked questions
What is the difference between a biostimulant and a fertilizer?
A fertilizer supplies nutrients. A biostimulant stimulates the plant's own processes to use nutrients better and cope with stress, regardless of its nutrient content.
What is the difference between a biostimulant and a biofertilizer?
A biofertilizer contains living micro-organisms that supply or release nutrients, such as nitrogen fixers and phosphate solubilisers. A biostimulant works on plant processes. In India they are regulated in different schedules of the FCO.
Is a biostimulant a plant growth regulator?
No. Plant growth regulators are synthetic or natural hormones regulated as pesticides. Biostimulants are regulated separately under the FCO.
What are examples of biostimulants?
Humic acid, fulvic acid, seaweed extract (Ascophyllum, Kappaphycus, Sargassum), protein hydrolysates, amino acids and botanical extracts.
What is biostimulant in Hindi?
In Hindi it is often called jaiv uttejak (जैव उत्तेजक): a product that stimulates the plant's own growth processes.
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