Supplying soil and roots with air or oxygen. Geolite is an example of a medium with excellent aeration. In some hydroponic systems, a nutrient solution is aerated by the output of an aquarium pump.
A system in which the roots of a plant are consistently or intermittently misted with fine droplets of nutrient solution.
Any ph over 7 is considered alkaline.
Fertilizer high in phosphorus (P) that increases flower yield.
The function of this micronutrient is not well understood, but it is suspected that it might aid carbohydrate transport.
Leaf tips that turn dark from excess fertilizer and salt burn.
Calcium is vital in all parts of plants to promote the translocation of carbohydrates, healthy cell wall structure, strong stems, membrane maintenance and root structure development. Calcium is a macronutrient.
A colorless, odorless, tasteless gas in the air necessary for plant life. Occurs naturally in the atmosphere at .03%.
This micronutrient is essential for photosynthesis, where it acts as an enzyme activator during the production of oxygen from water.
The condition of a sick plant with yellowing leaves due to inadequate formation of chlorophyll. Chlorosis is caused by a nutrient deficiency, usually iron or nitrogen; nutrient deficiencies are themselves often caused by a ph that is out of the acceptable range.
A plant produced through asexual reproduction including, but not limited to, cuttings, layering and tissue culture.
To soak new Rockwool in an acidic solution to lower the ph from 8.0 to 5.5.
This micronutrient is an internal catalyst and acts as an electron carrier; it is also believed to play a role in nitrogen fixation.
Disease that attacks young seedlings and cuttings, causing stems to rot at the base; overwatering is the main cause of damping-off.
The amount of dissolved solids, usually fertilizer salts, that are measured in water in parts per million.
A hydroponic method wherein air pressure from a small air pump is used to percolate nutrient solution out through a ring of feeder tubing which encircles the plant.
A very efficient watering system that employs a main hose with small water emitters. Water is metered out of the emitters, one drop at a time.
A hydroponic system in which the medium, usually aggregate pebbles, is periodically flooded with nutrient solution and then drained again, feeding and aerating the medium and root system.
Misting plants with fertilizer solution, which is absorbed by the foliage.
A product that destroys or inhibits fungus.
Any of a major group (Fungi) of saprophytic and parasitic spore-producing organisms usually classified as plants that lack chlorophyll and include molds, rusts, mildews, smuts, mushrooms, and yeasts. Common fungal diseases that attack plants are “damping-off,” Botrytis, and powdery mildew.
The process of causing the initiation and development of a plant from seed.
To gradually acclimatize a plant to a more harsh environment. A seedling must be hardened-off before planting outdoors.