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There are 84 entries in the glossary.
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Term Definition
RESERVOIRThe container in a hydroponic system which holds nutrient solution in reserve for use.
 
REVERSE OSMOSISThe process of removing minerals from water, which is forced by pressure through a differentially permeable membrane, filtering out the minerals; can happen when growers accidentally apply too strong of a nutrient to a plant's roots, leeching life out of the plant.
 
ROCKWOOLInert, soilless growing medium consisting of woven, thin strand-like fibers made from molten volcanic rock and limestone, which is heated to over 2900 degrees F, extruded, and formed into slabs, cubes and blocks.
 
SECONDARY NUTRIENTSCalcium (Ca) and magnesium (Mg) are considered to be the secondary nutrients.
 
STAMENThe basic part of the male flower that includes the stalk (or filament), anther, and pollen.
 
STERILIZATIONThe act of rendering something free from living cells. In hydroponics it is essential that all materials (especially any growing medium) used are sterile to avoid contaminating the hydroponic system. Steam and chemical agents are often used in this process.
 
STIGMAThe surface at the end of the pistil on a female flower where pollen lands and germinates.
 
STYLEThe part of a female flower that supports the stigma.
 
SYSTEMICUsed in reference to a disease within the plant tissue, not initiated from the external cells. Also refers to materials and compounds which are taken up or absorbed by the plant and designed to fight disease (e.g. systemic fungicide).
 
VERMICULITEMica which has been processed and expanded by heat. Vermiculite has excellent water-retention qualities and is a good soil amendment and medium for rooting cuttings.
 


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