You have just purchased a bale of Germination substrate and want to ensure that every seed and every seedling thrives with the greatest possible uniformity. This guide covers preparation, sowing and the first 30 days up to pricking out, valid for seedbeds in modular trays, plug trays and professional seedling production.
Product specifications
| Specification | 250 L bale |
|---|---|
| SKU | 510250 |
| Particle size | Fine (0 - 6 mm) |
| pH | 5.5 - 6.5 |
| Fertilization | Low NPK + micronutrients |
| Organic matter | > 80% |
| Approx. expanded volume | 250 L (66 gal) |
Step by step to use it
Hydrate the peat 12-24 h beforehand
Open the bale and pour the contents into a clean tub or tarp. Water with warm water until the substrate is moist and crumbly but not waterlogged. Let it rest for 12 to 24 hours so the fiber expands and absorbs evenly.
Fill the trays without compacting
Load the tray cells with the hydrated substrate. Push lightly with your hand to settle the material but never press down: compaction eliminates the root aeration the seedling needs. The surface should sit 2 mm below the edge of the cell.
Sow at the correct depth
As a rule, sow each seed at a depth equivalent to two or three times its diameter. For very small seeds (lettuce, basil, tomato), simply rest them on the surface and cover them with a thin layer of sieved substrate.
Initial watering by capillarity or fine misting
Water by immersing the tray for 1 to 2 minutes until you see the surface moist, or apply a very fine mist from above. Avoid direct jets that dislodge the seed. The surface should be evenly moist to the touch.
Maintain until pricking out
Keep moisture constant without saturating. When the seedling has 2 - 3 true leaves, it is ready for pricking out into a pot or container with universal substrate. The initial fertilization lasts 3 - 4 weeks; after that, begin soluble fertigation.
Questions about the fertilization schedule?
If your crop is demanding or does not fit the typical schedule, ask the virtual assistant with the species and the ambient temperature. It will suggest specific NPK and frequency adjustments.
Complementary products
To get the most out of your germination bale, pair it with suitable trays and, if you fertilize with intensive irrigation in warm climates, mix in 10 - 15% perlite or vermiculite to improve aeration.
Maintenance and care
An opened bale lasts indefinitely if you keep it closed in a dry, cool and shaded place. Avoid direct sun exposure and high temperatures that trigger microbial activity. Once opened, it is best to use it within a few months to preserve the initial pH and fertilization.
In the Caribbean climate, water the trays first thing in the morning and at dusk. Avoid watering at midday: the thermal contrast between the water and the surface stresses the seedling and promotes damage from excess evapotranspiration.
Do not reuse germination substrate after the first seedling cycle. Although it may look usable, it already contains root exudates, fertilizer residues and possible invisible pathogens that will ruin the next batch of seeds. Use fresh substrate every cycle.
Frequently asked questions
How long does the original fertilization last without adding anything?
The initial low NPK fertilization covers 3 to 4 weeks of seedling growth, depending on the species and the temperature. When 2 - 3 true leaves appear, begin fertigation with a soluble NPK suited to the crop (for example, a 0.5 - 1 g per liter solution of a balanced 20-20-20).
Can I use this substrate directly in a small pot without going through a tray?
Technically yes, but you will lose value: the fine structure and low fertilization are optimized for the germination stage. For pots and direct transplanting, use universal substrate with standard NPK and medium structure, which better withstands the watering of a crop in production.
What do I do if the seedlings turn yellow within a week?
Yellowing within a week usually indicates overwatering (the most likely reason in the Dominican climate) or a pH shifted by highly alkaline irrigation water. Check that the tray drains well and review the pH of the irrigation water: if it exceeds 7.5, adjust it with citric or nitric acid to pH 6.0 - 6.5 before watering.