HELPFUL LIST   (A to Z)



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Acidity - Defines the measure for the uptake of nutrient salts by 
 the plant. Acidity is indicated by the pH value.  
 (A pH value of 5.8 is ideal for the cultivation of cannabis.)

B - Abbreviation for boron, a material necessary in very small 
 quantities for the growth of cannabis.

Blue light - Light given out by mercury-iodide lamps which is necessary
 for the formation of chlorophyll in plants. 
 Blue light has a wavelength of approximately 445 nanometres

Ca - Abbreviation for calcium; necessary for osmotic processes in the
 plant Chlorophyll - The official name for 'leaf-green'. Chlorophyll
 gives the plant  its green colour, and is important in the conversion
 of CO2 and H2O into glucose.

Clones - Weed-growers' jargon for cuttings.

CO2 - The chemical formula for carbon-dioxide; next to water, the most
 important basic material for the growth of plants.

C6H12O6 - Chemical formula for glucose, the basic material used by plants
 for growth and flowering.

Dark Part of photosynthesis. During response, the dark reaction, the
 actual formation of glucose from water and carbon-dioxide takes place.

Deficiency Plant disease brought on by the disease-application of too
 little of a certain fertilizing material.

EC - Electrical conductivity. The electrical conductivity standard of
 water, which can be measured with an EC meter, tells whether or not the
 composition of the fertilizer is correct

Fe - Abbreviation for iron; an element in the nutrient solution.

Generative phase - The flowering phase of plants. When cannabis is
 cultivated indoors, this phase begins, at maximum, one week to ten days
 after a clone with roots is planted, and continues, depending on the
 variety, two to three months.

GH - Abbreviation for 'German hardness', a scale for the hardness of
 water (namely the quantity of calcium) indicated in degrees.

High- Cultivation under artificial light pressure makes use of
 high-pressure gas lamps. They give out the desired quantity of light
 with the desired wavelength. (High-pressure sodium lamps - red light for
 growth, mercury-iodide lamps -blue light for the formation of chlorophyll)

H2O - Chemical formula for water, consisting of two parts hydrogen(H),
 and one part oxygen (O).

Hygrometer - A meter with which the relative humidity can be established

Hygrostat - An apparatus which maintains correct relative humidity. A
 good hygrostat keeps the relative humidity constant in a room.

Internodes - The distance between the leaves and the tops of a plant. 
 When light only from the red spectrum is applied during the generative
 phase, the internodes become longer.

K - Abbreviation for potassium, which is, next to nitrogen and phosphate,
 one of the primary nutrients for plants.

Light Part of photosynthesis in which response photolysis takes place. 
 Photosynthesis also includes the dark response, in which the actual
 formation of glucose occurs.

Lumen - The international measure for luminosity from a light source.

Ma - Abbreviation for manganese, an element used in very small quantities 
 by plants.

Membrane- Membrane allowing small molecules to pass through but not the
 larger ones.

Mg - Abbreviation for magnesium, an element plants need for the build-up
 of chlorophyll, and for osmotic processes.

Micro-element - Nutrients the plant only barely needs; for example,
 copper and zinc.

Millisiemens- The international measure for electrical conductivity.(mS)

Nanometre - Measure of length used to express the wavelength of light. 
 Red light travels at a wavelength of approximately 650 nanometres(nm),
 blue light at approximately 450 nm. 
 A nanometres is one thousand millionth of a meter(10-8m).

NPK - Abbreviation for nitrogen (N),phosphate (P), and potassium(K),
 the three primary nutrients for plants.

Osmosis - The phenomenon in which water containing a dissolved substance
 of a low concentration is absorbed via a membrane into water which
 contains substances of higher concentrations  (for example in plants). 
 Osmosis is very important to plants for sturdiness, and for the transport
 of water and nutrient materials. Pressure is built up by osmosis, making
 the plant sturdy. If this pressure falls, the plant loses its sturdiness.

P - Abbreviation for phosphate, one of the three primary nutrients.

pH - The pH is a measure of the acidity of a solution (for example, water
 with nutrients). The pH scale goes from 0 to 14. The lower the pH value,
 the more acidic the solution

Photolysis - Part of photosynthesis, in which water (H2O) is split up
 into Hydrogen (H), and Oxygen (O). This occurs during the light response.

Photosynthesis - The chemical process in plants, in which carbon dioxide
 and water are converted into glucose by the influence of light energy.

Phototropism - The inclination, which plants have, to grow towards light.

Physiology - The science of growth. (Plant physiology is the science
 concerned with the growth and flowering of plants)

ppm - 'Parts per million'. 
 The amount of material in the air, of CO2, for example, is expressed not
 only in percent, but also in ppm. 0.03% CO2 in the air is equivalent to
 300 ppm.

Predator - A predator is an insect that protects plants against other
 insects such as spider mites, white flies, and thrips.

Red light - Light needed by plants in order to grow. Red light has a
 wavelength of approximately 650 nanometres.

RH - Abbreviation for relative humidity. The relative humidity is expressed
 in %, and measured with a hygrometer.

S - Abbreviation for sulphur, a nutrient which plants need only in small 
 quantities.

Salts - Nutrients, such as NPK, but also other materials (Ca, Mg, etc.)
 which are dissolved in water so they can be fed to the plant. We call the
 solution of such materials salts.

Semi-permeable walls/membranes permeable - Play a role in osmotic processes
 in plants by which the transport of water and nutrients takes place, and
 the plant gets its strength.

Skuff - Sifted tops, from which you get as-pure-as-possible THC.

Stoma - An organ in the leaves of plants. The stomata allow the plant to 
 breathe. Oxygen and excess water are released through the stomata.

Substrate - The 'soil'. Thus rock wool substrate means 'soil of rock wool'
 the growth medium.

T-44, T-77 - Measures for sieves with which you can sift out THC resin.

THC - tetra-hydro-cannabinol. 

Trace-element - Another name for micro-element, nutrients the plant needs
 in only minute quantities, such as boron and manganese.

Vegetative- The growth phase of plants. 
 This lasts phase - only a short while in the cultivation of cannabis;
 from one week to ten days maximum.

Zn - Abbreviation for zinc, a nutrient which plants need in small quantities.


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