Seasol Plus (Seaweed, Fish and Humate Soil Conditioner)

Seasol Plus is a seaweed, fish and humate soil conditioner from Seasol International Pty Ltd, built for growers who want plant stimulation, soil conditioning and extra nitrogen in one product.

It suits broadacre cropping, pasture, orchards, vegetables and turf, and growers apply it through boom sprays, drip and micro-irrigation, fertigation or seed coating. The blend stimulates soil microbial activity and improves soil structure, so plants take up nutrients more efficiently. Because it aids establishment and reduces transplant shock, growers often apply it at seeding, transplanting and at key stress points such as before and after heatwaves or frosts. Seasol Plus works within a broader nutritional program and delivers the most consistent results alongside a balanced fertiliser regime.

Pack Sizes: 5 litre, 20 litre, 200 litre, 1000 litre. Registrant: Seasol International Pty Ltd (APVMA #: Not applicable)

Click For Technical Info & Tips For Use

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2 or more	$110.00 each	Available
2 or more	$280.00 each	Available

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Description

Seasol Plus is a seaweed, fish and humate soil conditioner from Seasol International Pty Ltd. It carries a typical analysis of 5.4% nitrogen (N), 0.1% phosphorus (P) and 2.6% potassium (K). This blend delivers plant stimulation, soil conditioning and a nitrogen lift in a single application.

Growers use Seasol Plus for soil improvement programs, seed bed preparation, pasture renovation and watering in transplants. The kelp, fish and humate blend stimulates soil microbial activity, lifts nutrient uptake and improves soil structure. It performs best when growers apply it as part of a broader, balanced fertiliser program.

How Seasol Plus Soil Conditioner Works

Seasol Plus works by stimulating microbial activity in the soil, which in turn lifts nutrient uptake through plant roots. The seaweed component supports root development, and the added fish and humate contribute organic matter and trace elements. As a result, treated soil holds structure better under stress, and plants establish faster after transplanting. Consequently, growers often apply Seasol Plus at key stress points, such as before and after heatwaves or frosts. This timing protects crops and supports recovery.

Typical Analysis

Property	Value	Units
Nitrogen (N)	5.4%	% w/v
Phosphorus (P)	0.1%	% w/v
Potassium (K)	2.6%	% w/v
pH	10.5 – 11.4	–
Specific Gravity	1.1	–
Total Solids	22%	% w/v
Total Organic Matter	15%	%

Trace elements (mg/L unless stated): Boron 8, Calcium 1,670, Cobalt 0.5, Copper 5, Iron 940, Magnesium 250, Manganese 10, Molybdenum <0.5, Sodium 5,450, Sulphur 1,650, Zinc 12. Seasol Plus is a natural product, so individual component concentrations may vary from batch to batch.

Key Benefits

Improves soil structure and soil microbial activity
Stimulates root growth and increases flowering
Aids plant establishment and reduces transplant shock
Provides essential trace elements for plant health

How to Use Seasol Plus

Seasol Plus suits application via boom spray, drip or micro-irrigation, overhead or travelling irrigators, fertigation equipment or seed coating. Growers dilute it in water before use and apply it as a foliar spray or direct soil treatment. Full crop rates and application windows appear in the Directions for Use section below.

Frequently Asked Questions

Q. What does Seasol Plus contain?

A. Seasol Plus blends Seasol seaweed extract with added fish and humate. This combination delivers a typical analysis of 5.4% nitrogen, 0.1% phosphorus and 2.6% potassium, plus a range of trace elements.

Q. How do I apply Seasol Plus to pasture?

A. Apply Seasol Plus at 10 L/ha at the start of the growing season and after each cut or grazing event. Growers commonly run 4 to 5 applications at critical growth stages through the season. Do not graze pasture with ruminant animals for 3 weeks after application.

Q. Can I mix Seasol Plus with other farm chemicals?

A. Yes, in most cases. Seasol Plus tank mixes with a number of agricultural chemicals, but never combine it with calcium nitrate. Always check current tank mix compatibility information at seasol.com.au before mixing.

Q. How long can I keep Seasol Plus once diluted?

A. Use diluted Seasol Plus within 24 hours. Agitate the mix before application, and re-agitate it if the tank stands for an extended period. Never apply the product undiluted.

Q. What pack sizes does Seasol Plus come in?

A. Seasol Plus comes in 5 litre, 20 litre, 200 litre and 1000 litre packs. Seasol International Pty Ltd manufactures it in Australia at Bayswater, Victoria.

Fertiliser Product Range

Features & Benefits

Improves soil structure and soil microbial activity
Stimulates root growth and increases flowering
Aids plant establishment and reduces transplant shock
Provides essential trace elements for plant health
Supplies nitrogen, phosphorus and potassium (5.4% N, 0.1% P, 2.6% K)
Suits boom spray, drip and micro-irrigation, overhead and travelling irrigator, and fertigation equipment
Works as a foliar spray or direct soil application
Compatible with a range of agricultural chemicals, except calcium nitrate
Manufactured in Australia by Seasol International Pty Ltd

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Directions Of Use

Click here for Seasol Plus directions for use.

General Instructions:

Dilute Seasol Plus in water before use, and never apply it undiluted.
Shake or agitate the product before use, and maintain agitation during dilution and application where possible.
For foliar spraying, apply the mixed product as soon as possible and maintain tank agitation.
For fertigation, agitate the product regularly in the fertigation tank, and for best results, run Seasol Plus on its own rather than blended with other inputs.
Add a non-ionic wetting agent for plants that are hard to wet, and avoid application under extreme weather conditions.
For climatic stress protection, apply 5-10 L/ha 3 to 7 days before and after extreme events such as heatwaves or frost.

Application Rate Table:

Category	Crop	Rate	Application / Critical Comments
Nut Trees	Almonds, hazelnuts, macadamias, pecans	5-10 L/ha or 1 mL per sq m of plant area	Apply at planting, drenched or watered in at 1:400 dilution. Apply from green tip or first growth flush. Run 5 applications at critical growth stages, including post-harvest. Use the higher rate for larger trees.
Deciduous Fruit Trees	Pome fruits, stone fruits and other deciduous species	5-10 L/ha or 1 mL per sq m of plant area	Apply at planting, drenched or watered in at 1:400 dilution. Apply at each growth flush, or run 5 applications at critical growth stages and post-harvest. Use higher rates for larger trees.
Evergreen Tree Crops	Avocados, bananas, citrus, olives	5-10 L/ha or 1 mL per sq m of plant area	Apply at planting, drenched or watered in at 1:400 dilution. Apply from bud initiation and at each growth flush. On mature trees, apply 10 L/ha per month, fertigated every irrigation month.
Fruiting Annuals	Capsicums, cucurbits, strawberries, tomatoes, pumpkins	5 L/ha	Apply at seedling and transplanting stage and from 15 cm growth. Repeat every 10 to 14 days, or run 4 applications as required.
Leafy Vegetables	Asparagus, brassicas, celery, herbs, lettuces	5 L/ha	Apply at planting out as a 1:400 dilution (2.5 mL/L or 2.5 L per 1,000 L water), for watering in seedlings through a water wheel planter or similar device. Apply at the seedling and transplanting stage and from 3 to 4 leaves. Repeat every 10 to 14 days, or run 4 applications as required.
Root Vegetables	Carrots, onions, potatoes, sweet potatoes	10 L/ha	Apply from in-furrow. Run 4 to 5 applications at critical growth stages.
Vine & Berry Crops	Blueberries, raspberries, wine grapes, table grapes	5-10 L/ha or 1 mL per sq m	Apply regularly through the growing season. As a minimum, apply at pre-flowering, fruit filling and post-harvest. Use higher rates for larger canopies. Do not apply directly over flowers where flowers are essential to crop productivity. For blueberries and table grapes, stop foliar application once bloom develops to avoid damage.
Broadacre & Turf	Canola, cotton, pasture crops including lucerne, sugar cane, turf	10 L/ha or 1 mL per sq m	Apply at the start of the growing season and after each cut or grazing event in a rotational or strip grazing system. Apply post-emergence, running 4 to 5 applications at critical growth stages. For seed coating cereals, use up to 4-10 L per tonne of seed, and do not exceed a total of 10 L per tonne. For sugar cane, apply 5 L/ha in-furrow or as a billet dip, then a second application of 10 L/ha at tillering. For ratoon crops, apply 10 L/ha at tillering. Do not graze pasture with ruminant animals for 3 weeks after application.

Re-treatment Interval: This varies by crop category. Most horticultural crops run on a 10 to 14 day cycle, or 4 to 5 applications at critical growth stages. Broadacre and pasture applications repeat at the start of the season and after each cut or grazing event. See the table above for crop-specific timing.

Critical Comments:

Do not apply directly over flowers where flowers are essential to crop productivity.
For blueberries and table grapes, stop foliar application once bloom develops, to avoid crop damage.
Do not exceed a total of 10 L of liquid per tonne of seed when seed coating cereals.
Do not graze pasture with ruminant animals for 3 weeks after application.
Do not combine Seasol Plus with calcium nitrate in a tank mix.

Rates are a general guide only. Before opening, carefully read Seasol Plus directions for use, precautionary and protection statements, storage and disposal, safety directions and first aid instructions. The product is designed for the particular purpose indicated on the label. Failure to use the product strictly as directed may be illegal and dangerous, and render the product ineffective.

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Disclaimer: This information and product advice is not intended to be advice or recommendations for any specific use or circumstance. You should seek specialist advice before using any product. Always follow the manufacturer’s guidelines. Specialist Sales liability is limited.

Tips For Use

Mixing and Compatibility

Seasol Plus tank mixes with a number of agricultural chemicals.
Do not combine Seasol Plus with calcium nitrate.
Check current tank mix compatibility information at www.seasol.com.au before mixing with any other product.

General Handling

Add a non-ionic wetting agent for plants that are hard to wet.
Avoid application under extreme weather conditions.
Apply the mixed product as soon as possible, and maintain agitation in the spray tank where possible.
For fertigation, agitate the product regularly in the tank, and run it on its own for best results.

Storage

Do not store Seasol Plus for prolonged periods in hot conditions above 30°C.
Keep the product out of direct sunlight.
Use safe work practices when lifting and handling drums.
Use diluted product within 24 hours, and agitate or re-agitate it if it stands for an extended period.

Safety Directions

Keep out of reach of children.
Not for human consumption. Do not swallow.
May cause irritation to the skin or eyes.
If splashed on skin or eyes, wash off with water.
If swallowed, or if irritation persists, seek prompt medical advice.
Wear gloves and a face shield when handling this product.

First Aid

If inhaled, remove the affected person from the contaminated area and keep them at rest until they recover. Seek medical attention if symptoms develop or persist.
If swallowed, do not induce vomiting. Wash out the mouth thoroughly with water and seek immediate medical attention.
If skin contact occurs, remove contaminated clothing immediately and wash the affected area thoroughly with soap and water.
If in eyes, hold eyelids apart and flush continuously with running water for several minutes, removing contact lenses if present, until all contaminants clear.
If poisoning occurs, contact a doctor or the Poisons Information Centre. Phone Australia 131 126.
For further information, refer to the Safety Data Sheet (SDS).

This information and product advice are not intended as advice or recommendations for any specific use or circumstance. You should seek specialist advice before using any product. Always follow the manufacturer’s guidelines. Specialist Sales liability is limited.

Withholding Period

Withholding Period Details (WHP):

Pasture, broadacre and rotational or strip grazing situations: Do not graze pasture with ruminant animals for 3 weeks after application.
All other registered uses (nut trees, deciduous and evergreen tree crops, fruiting annuals, leafy and root vegetables, vine and berry crops): Not applicable when used as directed.

SDS & Technical

Seasol Plus Directions for Use	Download Pdf
Seasol Plus SDS	Download Pdf
Seasol Plus Product Analysis	Download Pdf