[Light] [Air] [Water] [Grow Matrix / Medium] [Nutrients]
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Soil vs Deep Water Culture vs Ebb/Flood vs Irrigation methods vs other Mediums
Soil-water potential is a measure of the potential energy per unit mass, volume, or weight of soil
GROWTH MEDIUMS:
ROCKWOOL - high pH, so soak or buy rockwool that has a set pH
COCO COIR - ProMix Brand
Soil
SAND
Hydroponic mediums or containers or troughs
The media you choose to grow in also has its own natural pH and mineral holding tendencies.
Rockwool is more pH neutral (7) and must be prepared for planting, where coco coir and soil are more interactive with added minerals.
Coir and soil hold some minerals (through a process called Cation Exchange Capacity) in the soil particles, making them less available to the plants.
Multi-substrate use could lead to important changes in terpene product profiles upon substrate profile changes under perturbation of metabolism in stressed plants as well as under certain developmental stages. https://www.frontiersin.org/articles/10.3389/fpls.2016.01019/full
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Use SAND as part of soil mix to ensure a good drainage.
Sand can be sifted, washed, and recycled to save on materials and avoid over-usage of soil ingredients.
New transplants may utilize higher sand mixtures before being up-potted.
Sand doesn’t easily retain minerals, so unless you have nutrients to add, be sure there are other soil components or the plant won't be exceptionally strong/fruitful for commercial use.
Never use only SAND (unless you are willing to do a lot of experimenting maintaining water/nutrient levels in a hydroponic set up, and avoid bacterial growth with cleaned sand.)
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| Sand |
The aerated water system is probably the most complex of the hydroponic systems, and because it allows the least margin for error, it should be used only by growers with previous hydroponic experience.
To put together an aerated water system, you must first construct a clear air channel in your container. This is done by inserting a plastic tube cut with holes through the medium.
A water tank aerator is placed at the bottom of the plastic tube. The air channel allows the air to circulate without disturbing the roots, and the roots use the oxygen dissolved in the water.
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ScrOG - Screen Of Green (Sea of Green refers general appearance of an indoor canopy)
Using this Screen of Green technique, a plant is sent to Bloom stage after short Veg/Growth; by growing at a lower height with a spread canopy of equally lit dominant stems, total ScrOG production is fastest in smaller areas with low ceilings. Home growers could use this technique in a garage or basement. Producers only use this technique if absolutely necessary due to grow space.
This technique uses support netting like most commercial grows use, but with one instead of multiple levels.
Screening with a Sea of Green... but not a true ScrOG
Screening can stress a plant out, but recover under direct light and watered within 24 hours of screening them; Plants will have grown into the screen a little bit in a couple of days, and you’ll have a better sense of where each branch wants to go and where all the buds will develop.
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For Cannabis, vertical farming is shelf elevation, but also tower-oriented grows!
vs
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AIR LAYERING
Air layering plants requires a moist environment for "aerial roots" to form.
Most plants can be air layered and, even if no rooting takes place, the original plant is not damaged by the process since you do not remove the donor material until it has produced roots.
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