Vocab Post 4
Macronutrients - For a plant, there are nine major elements essential for healthy growth;
these are called macronutrients. They are: carbon, hydrogen, and oxygen (which are all
three derived from air and water); and nitrogen, phosphorus, potassium, calcium, sulfur,
and magnesium (from the soil).
Micronutrients - There are about eight nutrients essential to plant growth and health
that are only present in very small quantities. These are manganese, boron, copper, iron,
chlorine, cobalt, molybdenum, and zinc.
Medium - A soil or soil-less mix used to start or re-plant houseplants, flowers,
vegetables, and other plants
Mids - Medium grade cannabis. (See Shwag)
Mottling of Leaves -- Discoloration or spotting of leaves.
MV - Means 'Mercury Vapor' And is the type of lights that were used for streetlights many years ago.
Not very good for growing because it doesn't provide enough of the right kind of light
spectrum. While they do provide a littleof the blue spectrum, MV also produces too much
heat to get very close to a plant, and are very inefficient to operate.
MH - Means 'Metal Halide', And is a very good source of the white/blue spectrum of light that is
ideal for vegetative growth. Many growers use MH during the vegetative phase. MH is
bright and cost efficient to operate, but not as efficient as HPS lights. Most commonly
used sizes are 400 watt and 1000 watt. Works best when used in combination with HPS
Necrosis - Death of parts of the plant, usually refers specifically to the leaves.
NFT - Means "Nutrient Film Technique". It's a type of hydroponics, where you have the
water constantly moving through the roots, usually on a timer with nutrients added to the
water. Thereby allowing the roots to take in what they need, as they need it. It's a good
way to prevent
Node - The point on a stem where a leaf is attached or has been attached; a joint.
NPK - The elemental symbol for nitrogen is N; for phosphorus it's P; for potassium it's K.
All three of these elements are essential for plant growth and are considered
macronutrients. N, P, and K are the three principal ingredients in most fertilizers. The
NPK ratio is shown by three numbers, such as 2-1-1, that reflect the percentage of each.
Nutes - Nutrients or Fertalizers.
Nute-Burn - The result of feeding a plant an excess of fertilizer or nutrients.
Nute-Lock - When the pH is off and it locks the nutrients into the soil, thereby preventing
the plant from absorbing them.
Organic Nutrients - Natural, non-synthetic nutrients.
Peat moss --The partially decomposed remains of mosses harvested commercially from
the wild. Though difficult to wet initially, peat moss can absorb up to 25 times its own
weight in water and is therefor valued as a an organic soil amendment. Peat moss is
acidic --with a pH of about 3 or 4.0-- and should only be used around acid-loving plants or
to help lower the pH of alkaline soils.
Perlite -- a unique volcanic mineral which expands from four to twenty times its original
volume when it is quickly heated to a temperature of approximately 1600-1700 degrees
F. This expansion is due to the presence of two to six percent combined water in the
crude perlite rock which causes the perlite to pop in a manner similar to that of popcorn.
When expanded, each granular, snow-white particle of perlite is sterile with a neutral pH
and contains many tiny, closed cells or bubbles. The surface of each particle is covered
with tiny cavities which provide an extremely large surface area. These surfaces hold
moisture and nutrients and make them available to plant roots. In addition, because of
the physical shape of each particle, air passages are formed which provide optimum
aeration and drainage. Because perlite is sterile, it is free of disease, seeds, and insects.
Perlite has been used for many years throughout the world for soil conditioning and as a
component of growing mixes with materials such as peat moss or bark. Extensive studies
have shown that the unique capillary action of perlite makes it a superior growing media
for hydroponic cultures.
Among the many uses of perlite today are propagation and seed cultivation, plug
production and transplants, interiorscape and planter growing, composting,