Seabird guano, nitrogen and phosphorus fertiliser

Regular price ¥1,800
Regular price Sale price ¥1,800
Poids Price Price per kg vs 1 Kg
1 Kg ¥1,800 ¥1,800—
4 Kg ¥6,400 ¥1,600−11 %
¥600 × 3 with no fees

This pure, unprocessed seabird guano has an NPK of 14-9-2, and it can be used in organic farming.

In the vegetable garden, allow 50 to 100 g per square metre, throughout the growing season.

Organic fertiliser
Poids : 1 kg
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The summary

Pure marine guano, 14% nitrogen and 9% phosphoric anhydride, for the vegetable garden and the orchard

Agro Sens seabird guano is a pure, unprocessed fertiliser, usable in organic farming, with an analysis of 14% nitrogen, 9% P2O5 and 2% K2O. Its high nitrogen content makes it a growth fertiliser for the vegetable garden, at 50 to 100 g per square metre, from March to October.

This guano is a deposit left by seabirds, pure and unprocessed. Its formulation is that of a growth fertiliser: 14% total nitrogen, 9% P2O5 and 2% K2O, which puts nitrogen well in the lead. This is why it is used at the start of your crops, when the plant is building its leaves and roots before producing flowers and fruit. It can be used in organic farming.

A soil fertiliser, not for water

At 14% nitrogen, this guano is for spreading on a vegetable bed, never in a system that feeds crops. In an aquaponic system, the nitrogen already comes from the fish, and adding more simply doubles up a source that is already there. The nitrogen cycle in aquaponics explains where this nitrogen comes from and what converts it. If you are feeding plants in water, choose the mineral supplements formulated for a nutrient solution instead.

🏡 Doses, surface by surface

The dose is worked out in grams per square metre, and it varies according to what is growing on the surface. To measure without scales, remember that a closed handful weighs about 40 g: two handfuls therefore make up the average dose for one square metre of vegetable garden. At these doses, a 1 kg bag feeds 10 to 20 m² of beds, and a 4 kg bag 40 to 80 m², which lets you choose the pack size according to the area you actually grow.

In the vegetable garden

Allow 50 to 100 g per square metre of cultivated bed, leafy salads and vegetables included.

In flower beds

Allow 100 g per square metre of perennial flower bed.

On lawns

Spread 80 g per square metre after the first mowing of spring.

🌱 Spread, rake in, water

When planting, mix the dose into the soil that fills the hole back in, so that the guano is not in direct contact with the roots. For maintenance, spread it on the surface around your plants, work it in with light raking, then water generously. This raking brings the granules into contact with moist soil, where the roots come to draw nutrients, whereas a fertiliser left dry on the surface is not absorbed. On dry soil, therefore, water first, then spread.

On poor soil, or for hungry crops, split the application into two over the season rather than giving it all in spring. Take a 10 m² vegetable plot: at the high dose it receives 1 kg over the year, that is roughly 500 g in April and 500 g in June, which works out at a generous handful and a quarter per square metre each time. That way you stay within the dose without ever doubling it, and the nitrogen is available just when your plants are building their foliage.

🗓️ From March to October

The period of use covers the whole growing season, from March to October. Give 50 to 100 g to a shrub depending on its size, and up to 200 g to a mature tree. Outside this window, your plants absorb little, and the nitrogen applied risks being washed away by winter rain before it has been used. As nitrogen is the dominant element here, plan for a potash supplement for fruiting crops: a potash and magnesium fertiliser takes over at flowering, when the plant's needs shift towards the fruit.

Technical specifications

Levels

Nitrogen
14 % total N
Phosphorus and potash
9% P2O5 and 2% K2O

Type of product

Composition
Pure seabird guano
Certification
Organic farming

Recommended doses

Vegetable garden and flower beds
50 to 100 g per m²100 g per square metre in a perennial flower bed.
Trees and shrubs
50 to 200 g per plantUp to 200 grams for a mature tree.

To budget for separately

Potash supply
A potassium fertiliser
Organic matter
A wormery

In the box

  • 1 bag of 1 kg or 4 kg, depending on the pack size chosen

Contents, application rates per square metre and certification taken on 20 September 2026 from the Agro-Sens seabird guano data sheet.

Three fertilisers, three different deficiencies to make up

This guano is the one that supplies nitrogen. The other two contain none at all.

A pale plant, or leaves turning yellow between the veins A plant that is pale all over is most often short of nitrogen. Older leaves that turn yellow between their veins point instead to a magnesium deficiency.

Elements suppliedSupplies potassium and magnesium togetherProvides nitrogenGranules to spread on the groundProvides magnesiumDose given per square metre or per litreRecommended dosePrice
Patentkali fertiliser granules, potash, magnesia and sulphurYour choicePotassium, magnesium, sulphurYesNoYesYesNo200 to 650 kg per hectare¥1,200
Recommended
Seabird guano, nitrogen and phosphorus fertiliserYour choice		Nitrogen, phosphorus, potassiumNoYesYesNoYes50 to 100 g per square metre¥1,800
Epsom salt, soluble magnesium sulphateYour choiceMagnesium and sulphurNoNoNoYesYes50 g per litre of solution¥800
Patentkali fertiliser granules, potash, magnesia and sulphur
What the fertiliser provides
Elements suppliedPotassium, magnesium, sulphur
Supplies potassium and magnesium togetherYes
Provides nitrogenNo
The shape
Granules to spread on the groundYes
Provides magnesiumYes
Use
Dose given per square metre or per litreNo
Recommended dose200 to 650 kg per hectare
In the shop
Seabird guano, nitrogen and phosphorus fertiliserRecommended
What the fertiliser provides
Elements suppliedNitrogen, phosphorus, potassium
Supplies potassium and magnesium togetherNo
Provides nitrogenYes
The shape
Granules to spread on the groundYes
Provides magnesiumNo
Use
Dose given per square metre or per litreYes
Recommended dose50 to 100 g per square metre
In the shop
Epsom salt, soluble magnesium sulphate
What the fertiliser provides
Elements suppliedMagnesium and sulphur
Supplies potassium and magnesium togetherNo
Provides nitrogenNo
The shape
Granules to spread on the groundNo
Provides magnesiumYes
Use
Dose given per square metre or per litreYes
Recommended dose50 g per litre of solution
In the shop

Contents, doses and certifications recorded on 20 September 2026 from the K+S France PatentKALI and epsoTOP data sheets, and from the Agro-Sens seabird guano data sheet.

Estimate your
delivery time

Dispatched as a tracked parcel from France, and can be combined with the rest of your order. The exact charges and delivery times are shown at the basket once the address has been entered. Outside the European Union, import duties and taxes are payable by the recipient.

Frequently asked questions

6 questions

6 key questions

How much for your area

Enter the surface area of the bed to be treated, in square metres.

m²
1 m²200 m²
0g

at the high rate in the vegetable garden, 100 g per square metre

at the low dose, 50 g per square metre
0 g

Doses per square metre taken on 20 September 2026 from the Agro-Sens seabird guano data sheet.

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