Marijuana Horticulture: The Indoor/Outdoor Medical Grower's Bible

electromagnetic wavelengths of light: Color and light spectrums are expressed in nanometers.
    necrosis/necrotic: localized death of a plant part due to injury or disease
    nitrogen (N): essential element to plant growth; one of the three major nutrients N-P-K
    node: 1. a joint; 2. the position on a stem from which leaves, shoots, or flowers grow

Necrosis
    N-P-K: nitrogen, phosphorus, and potassium: the three major plant nutrients
    nursery: gardening business that grows plants for sale or experimentation: A nursery is a great place to gather information.
    nutrient: plant food, essential elements N-P-K as well as secondary and trace elements fundamental to sustaining plant life

Node
    Ohms Power Law: a law that expresses the strength of an electric current: Volts × Amperes = Watts.
    open pollination: pollination that occurs naturally, as opposed to controlled pollination, no effect of selection from human interference
    optimum: 1. the most favorable condition for growth and reproduction 2. peak production
    organic: 1. made of, derived from, or related to living organisms: Growers of organic cannabis use fertilizers and insect control methods of animal or vegetable origin. Unaltered rock powders are also considered organic.
    osmosis: the equalizing movement of fluids through a semi-permeable membrane, such as in a living cell
    outbreeding: breeding between individual cannabis plants that are not closely related
    outcross: the process of breeding using individuals outside of the family, population, or group
    overload: load to excess: An electrical circuit that uses more than 80 percent of its potential is overloaded. A 20 amp circuit drawing 17 amps is overloaded.
    ovule: egg which contains the female genes and is found within the plant ovary: When fertilized, an ovule will grow into a seed.
    oxygen: tasteless, colorless, odorless element: Plants need oxygen in the soil in order to grow.
    parasite: organism that lives on or in another host organism without benefiting the host: Fungus is a parasite.
    passive: hydroponic system that moves the nutrient solution through absorption or capillary action
    pathogen: a disease-causing micro-organism, especially bacteria, fungi, and viruses
    peat: partially decomposed vegetation (usually moss) with slow decay due to extreme moisture, cold, and acidic conditions
    perennial: a plant, such as a tree or shrub, that completes its life cycle over several years
    perlite: amendment of sand or volcanic glass expanded by heat, which aerates the soil or growth medium
    pH: a scale from 0-14 that measures a growing medium’s (or anything’s) acid to alkaline balance: a pH of 7 is neutral, lower numbers indicate increasing acidity, and higher numbers increasing alkalinity: Cannabis grows best in a 6.5 to 8 pH range.
    pH tester: electronic instrument or chemical used to measure the acid or alkaline balance in soil or water
    phenotype: the outward form, characteristic, and appearance of a plant, determined by the interaction of the individual genotype with the environment
    phloem: the food- and water-conducting tissue of vascular plants
    phosphor coating: internal fluorescent bulb coating that diffuses light and affects various color outputs
    phosphorus (P): one of the macronutrients that promote root and flower growth
    photoperiod: the relationship between the length of light and dark in a 24-hour period; affects the growth and maturity of cannabis
    photosynthesis: the building of chemical compounds (carbohydrates that plants need for growth) from light energy, water, and CO 2

Photosynthesis
    phototropism: the environmental response movement of a plant part toward or away from a light source
    phyllotaxy: the arrangement of leaves on a stem, and the principles that govern such arrangement
    phytotoxic: substance that is toxic to plants normally burning the leaves.
    phytotron: a completely enclosed indoor area with extensive environmental controls for the experimental growth (and study) of plants
    pigment: the substance in paint or anything that absorbs light, producing (reflecting) the same color as the pigment
    pistillate: female; having pistils but no functional stamens
    pistils: small pair of fuzzy white hairs extending from top of female calyx: Pistils catch pollen and channel it into contact with the ovule for fertilization.
    pod, seed: a dry calyx containing a mature or maturing seed
    pollen: fine, yellow, dust-like microspores containing male genes
    pollen sack: male flower containing