Quick Summary

• Plant growth regulators, also called PGRs, are substances that change how a plant grows. They work in very small amounts.
• There are five main types: auxins, gibberellins, cytokinins, ethylene and abscisic acid. Growth retardants are a sixth group that slows growth.
• In India, farmers use PGRs such as NAA, GA3, ethephon, paclobutrazol and mepiquat chloride on crops like cotton, mango, grapes and tomato.
• Synthetic PGRs are regulated under the Insecticides Act, 1968. Biostimulants such as seaweed extract are regulated under the Fertilizer Control Order, 1985.
• A small mistake in dose or timing can hurt the crop. Always follow the label.
• Sagarika Liquid is a seaweed based biostimulant that contains natural auxins, cytokinins and gibberellins.

What Are Plant Growth Regulators?

Plant growth regulators are natural or man made substances that control how a plant grows. They can speed up roots, stop flowers from dropping, help fruit ripen, or slow down tall growth.

Plants make their own growth substances. These are called plant hormones. A plant needs only a tiny amount of them. Farmers also spray man made versions to get a result at the right time.

A PGR is not a fertilizer. A fertilizer feeds the plant. A PGR gives the plant a signal about what to do.

What Are the Main Types of Plant Growth Regulators?

Each type does a different job. In real farming, results come from the balance between them, not from one alone.

Natural vs Synthetic Plant Growth Regulators

Natural PGRs are made by the plant itself. Some seaweed also makes natural auxins, cytokinins and gibberellins. A seaweed extract carries these natural substances.

Synthetic PGRs are man made chemicals. Each one is made for a clear job, like NAA for flower drop or ethephon for ripening. They need an exact dose and exact timing.

The main difference is simple. A synthetic PGR is usually one chemical for one job. A seaweed extract is a mix of many natural substances that supports the plant in general.

Common Plant Growth Regulators Used in India

The Directorate of Plant Protection, Quarantine and Storage lists the registered uses of PGRs in India. Here are some common ones from its March 2024 list.

This list is for guidance only. The crop, dose and timing on your product label decide what you can use.

How Are Plant Growth Regulators Regulated in India?

There are two paths.

Synthetic PGRs are registered under the Insecticides Act, 1968. The Central Insecticides Board and Registration Committee handles this.

Biostimulants fall under the Fertilizer Control Order, 1985. Biostimulants were added to this order by notification S.O. 882(E) on 23 February 2021. Seaweed extracts sit in the first group of Schedule VI, called botanical extracts, including seaweed extracts.

A biostimulant is defined as a substance or microbe that boosts plant processes, nutrient uptake and stress tolerance. The definition leaves out pesticides and PGRs that are regulated under the Insecticides Act.

What this means for you: buy only from a licensed dealer, check the label, and ask for registration details when in doubt.

Why Plant Growth Regulators Need Careful Use

PGRs act at very low doses. That is why small errors matter. A US state pesticide regulator warns that improper rates or timing can cause unwanted effects on the crop.

Keep these points in mind:

• Dose: Even a slight excess can change plant growth in the wrong way.
• Timing: The same PGR can help at one growth stage and hurt at another.
• Weather: Heat, humidity, sunlight and rain change how well a spray works.
• Tank mix: Some PGRs do not mix well with other chemicals.
• Drift: Spray can drift onto nearby plants and harm them.

Can Seaweed Extract Work as a Natural Growth Booster?

Seaweed extract is not a copy of a synthetic PGR. It works in a wider way. It carries natural growth substances, plus compounds that help a plant handle stress.

Sagarika Liquid is a seaweed extract concentrate of 28 percent, made from red and brown marine algae. Its product page lists:

• Auxins, cytokinins and gibberellins, the natural growth substances
• Bio potash at 8 to 10 percent
• Essential amino acids
• Quaternary ammonium compounds, such as glycine betaine and choline, which help plants handle heat and drought
• Humic and fulvic acid

Sagarika's page does not publish the exact amount of each growth substance. So it is best to think of it as a biostimulant that supports the plant, not as a precise hormone dose.

It also does not replace a synthetic PGR when you need one clear result, such as ripening fruit with ethephon. And it does not replace NPK fertilizer. Read more in our guide on what seaweed extract is and how it works.

How to Use Sagarika Liquid on Your Crop

• Dose: 250 to 500 ml per acre. That is 2.5 to 5 ml per litre of water.
• Spray plan: Three sprays at key crop stages. For example, tomato, chilli and onion are sprayed at 25 to 30, 45 to 50 and 75 to 80 days after planting.
• Time: Early morning, after the dew dries.
• Mixing: It can be mixed with most pesticides. Do a small jar test first.
• Do not exceed the label dose. In one field trial published by Sagarika, very strong sprays gave less yield than no spray.

See the full dosage guide by crop for more.

How to Use Any Plant Growth Regulator Safely

1. Read the whole label before you buy.
2. Check that the crop and the purpose are on the label.
3. Measure the dose exactly. Do not guess.
4. Spray at the stage the label says.
5. Do a jar test before tank mixing.
6. Keep spray away from nearby crops and plants.
7. Ask your local agriculture officer if you are unsure.

Why Sagarika Is a Better Choice

• It comes from seaweed. Its growth substances are natural, not man made chemicals.
• It is NPOP certified organic, so it fits both organic and regular farms.
• It is made in India with a patented process licensed from the Central Salt and Marine Chemicals Research Institute, part of CSIR.
• The dose is small. Just 250 to 500 ml per acre.
• It has a long shelf life. The product page lists more than 5 years.
• It does more than one job. It supports roots, nutrient use and stress tolerance together.

Frequently Asked Questions

What are plant growth regulators?

Plant growth regulators are natural or man made substances that change how a plant grows. They work in very small amounts and give the plant a signal, such as to grow roots, flower or ripen.

What are the main types of plant growth regulators?

The five main types are auxins, gibberellins, cytokinins, ethylene and abscisic acid. Growth retardants, such as paclobutrazol, are another group that slows extra growth.

Are plant growth regulators the same as fertilizers?

No. A fertilizer feeds the plant with nutrients like nitrogen, phosphorus and potash. A plant growth regulator signals the plant to grow in a certain way.

What is NAA used for in farming?

NAA is a synthetic auxin. India's list of registered uses names it for tomato, chilli, mango, grapes, pineapple and cotton, mainly to stop flower and boll shedding.

What does ethephon do?

Ethephon releases ethylene. In India it is used for flower induction and even ripening in crops like mango, pineapple, coffee and tomato, and for latex yield in rubber.

Are plant growth regulators safe?

They are safe only when used as the label says. Because they work in tiny amounts, a wrong dose, wrong timing or wrong mix can hurt the crop.

How are plant growth regulators regulated in India?

Synthetic PGRs are registered under the Insecticides Act, 1968. Biostimulants like seaweed extract are regulated under the Fertilizer Control Order, 1985.

Is seaweed extract a plant growth regulator?

Seaweed extract contains natural growth substances, such as auxins, cytokinins and gibberellins. In India it is treated as a biostimulant, not as a synthetic PGR.

Can I mix plant growth regulators with pesticides?

Some can be mixed and some cannot. Always read the label and do a small jar test first. Sagarika Liquid can be mixed with most pesticides after a jar test.

How much Sagarika Liquid should I use?

Use 250 to 500 ml per acre, which is 2.5 to 5 ml per litre of water. Spray three times at key crop stages and stay within the label dose.

Conclusion

Plant growth regulators are powerful because a tiny amount can change how a crop grows. Synthetic PGRs like NAA, GA3 and ethephon give a clear result when the dose and timing are right. They also carry a risk when they are not. A seaweed biostimulant like Sagarika takes a gentler, wider approach by supporting roots, nutrient use and stress tolerance with natural growth substances. Use each one for the job it fits, and always follow the label. You can explore Sagarika's full product range here.