Using Rockwool Trays for Hydroponic Seeding

Using Rockwool Trays for Hydroponic Seeding

Hydroponic seeding guide

Rockwool TrayHydroponics is a method of cultivating plants using water as a growing medium. Even so, there are some plants that require additional planting media so that these plants can stand strong.

One of the media used is rockwool. Rockwool itself is a good hydroponic growing medium, made from basalt rocks that are heated at a fairly high temperature.

Rockwool Trays

image of Rockwool Trays

The first step to starting hydroponic cultivation is sowing seeds. Why should you sow yourself and not just buy ready-to-plant seeds? Because by sowing ourselves we know the quality of the seeds and will get maximum results, whereas if you buy ready-to-plant seeds, which are usually sown with soil, the yields are not satisfactory and are not suitable for planting using the hydroponic method.

Well, on this occasion we will share a guide for sowing hydroponic seeds with rockwool growing media. Before we move on to the seedling guide, we first learn to cut rockwool as a seedling medium. Check out the following reviews:

Guide To Cutting Rockwool For Seeds

  • First, take rockwool measuring 15(p)x12.5(l)x7.5(t) cm.
  • Cut the 7.5 cm (t) side into 3 pieces.
  • Cut the 12.5 cm (l) side into 4 pieces.
  • Finally, cut the 15 cm (w) side into 5 parts.
  • Rockwool is ready to use for seedlings

Guide To Seeding The Correct Hydroponic Seeds

  1. Cut rockwool with a size of 2.5 x 2.5 x 2.5 cm.
  2. Dip rockwool in water, then arrange in a tray and make holes.
  3. Put one seed in one hole (kale = 1 rockwool, 9 seeds, 9 holes).
  4. Water every morning, put it in a place that is exposed to direct sunlight.
  5. Provide nutrition after the leaves grow, usually 3/5 days old.
  6. Seedlings are ready to be moved when the leaves are 4 and roots appear, usually 7-14 days old

Last Word

There are 2 options for sowing hydroponics, which are covered with black plastic and not. So the reason why it is covered with black plastic is to keep the rockwool wet or moist until the seeds germinate. If it has germinated, it must be immediately opened and placed in the sun so that the growth is not finches (thin, tall, slender).

Always keep rockwool moist, don’t let it dry or there are puddles of water. Flush with water every day.

Nutrient water vs plain water? Nutrients can only be absorbed by plants through the roots, so nutrition can be done when they already have roots and leaves, usually when they are 4-5 days old. And even then it must be with a low PPM / EC, but with the addition of nutrients at the time of seedling it will cause mossy rockwool.

What water is good for hydroponic seeding? The answer is water whose ppm is closer to 0, the closer to 0 the better. The first choice is AC waste water, well water, PDAM water (which has been deposited for 5 days, to remove chlorine).

Growing In Rockwool Plant In Stone Wool Cubes

Growing In Rockwool, if you are looking for a causeless substrate for sowing seeds, rooting stems or hydroponics, consider using a stone wool nutrient medium.

This wool-like material is obtained by melting basalt rocks and twisting them into thin fibers. Then the stone wool for plants is formed into easy-to-use cubes and blocks. But is rock wool safe for food production?

Growing In Rockwool

Growing In Rockwool

advantages and disadvantages of growing in rock wool

safety : made from natural ingredients, rock wool does not contain harmful chemicals. It is safe to use as a nutrient medium and substrate for plants.

On the other hand, the impact of rock wool on humans is a health problem. Due to its physical properties, the nutrient medium for growing rock wool can cause irritation to the skin, eyes and lungs.

sterile : since mineral wool for plants is an industrial product, it does not contain weed seeds, pathogens or pests. This also means that it does not contain nutrients, organic compounds or microbes. Plants grown on mineral wool need a balanced and complete hydroponic solution to meet their nutritional needs.

water content : Due to its physical structure, rock wool quickly removes excess water. However, a small amount of water remains in the lower part of the cube.

This unique property allows the plant to achieve adequate hydration, allowing more air to circulate and saturate the roots with oxygen.

The difference in humidity levels from the top to the bottom of the cube makes rock wool ideal for hydroponics, but it can also make it difficult to determine when to water the plants. This can lead to excessive watering.

reusable : as a derivative of rock wool, rock wool does not break down and does not erode over time, so it can be reused many times. For the destruction of pathogenic microorganisms, boiling or steaming is recommended between meals.

The non-biodegradable material also means that it will be stored forever in landfills, which makes mineral wool for plants not such an environmentally friendly product.

how to plant in rock wool

Follow these simple instructions when using cubes or blocks for growing mineral wool:

    • preparation : Rock wool has a naturally high pH from 7 to 8. Prepare a slightly acidic aqueous solution (pH from 5.5 to 6.5) by adding a few drops of lemon juice using a pH test strip to achieve the correct acidity. Soak the stone wool cubes in this solution for about an hour.
    • seeding : place two or three seeds in the holes at the top of the rock wool planting medium. Water with a hydroponic nutrient solution. When the plant reaches 2-3 inches (5-7. 6 cm) in height, it can be transplanted into the ground or placed in a hydroponic garden.
    • cuttings with a stem : in the evening, before cutting the stem, carefully water the mother plant. In the morning, remove 4 inches (10 cm) of the cuttings from the mother plant. Dip the cut ends of the stems in honey or hormone for rooting. Place the stalk in stone wool. Water with a hydroponic nutrient solution.

Rock wool is the preferred substrate for many large hydroponic farms. But these clean, pathogen-free products are also available in smaller packages specifically designed for home gardeners.

Whether you’re growing lettuce in hydroponic bottles or installing a larger system, growing in rockwool gives your plants an advantage thanks to superior root zone technology.

FAQ Rockwool Tray

What are Jiffy or rockwool trays used for?

What are Jiffy or rockwool trays used for?Jiffy or Rockwool trays are used to keep your clones upright when they’re rooting – they contain one Jiffy or Rockwool cube per hole. When rooting an enormous number of clones you can simply place the entire tray in a room with a humidifier so that you don’t need to spray the clones every day.

Why Rockwool OEM insulation?

Why Rockwool OEM insulation?We supply an array of OEM insulation products for any type of building, system or application, increasing energy efficiency, built-in fire protection, and acoustic performances. Discover the benefit of ROCKWOOL OEM solutions today.

Do I need a jiffy or Rockwool cube for my clones?

Do I need a jiffy or Rockwool cube for my clones?If you’re planting thousands or seeds or r ooting thousands of clones that’s one thing, but when you’re rooting a series of 10-150 clones in a big propagator then you’re going to want to read this article. Jiffy or Rockwool trays are used to keep your clones upright when they’re rooting – they contain one Jiffy or Rockwool cube per hole.