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Definition
| Plants that can intiate flowering during days of any length. |
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Definition
| Plants that stop growing at a certain height. |
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Definition
| A light deficiency in plants, which appear elongated and yellow. |
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Definition
| A fluorescent lamp emits light from both low-pressure mercury vapor and fluorescent powder. |
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Definition
| The number of cycles per unittime regarding radiant energy. |
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Definition
| A high intensity dicharge lamp has elctrical discharge in a quartz tube filled with mercury or sodium vapors under pressure and surrounded by a UV absorbent glass envelope coated with phosphors. |
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Definition
| This lamp emits light from a tungsten filament heated to extremely high temperatures. produce a continuous spectrum from blue to infrared. |
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Definition
| Plants that don't stop growing. |
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Term
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Definition
| Light intensity at which plants will maintain themselves but not grow. |
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Term
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Definition
| A radiant flux emitted from a light source. |
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Definition
| Plants that initiate flowering only in day lenghts exceeding 12 hrs. |
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Term
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Definition
| Photosynthetically Active Radiation: the part of the radiant energy spectrum effective in photosynthesis |
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Term
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Definition
| A light meter that measures the intensity of visible light. |
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Term
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Definition
| Change in response too light. |
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Definition
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Term
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Definition
| The growth response of a plant to the length of day. Uninterrupted night differentiates short day and long day plants. |
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Definition
| The organized flow of energy through space. |
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Term
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Definition
| Instrument useful for measuring all wavelengths of solar radiation. |
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Term
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Definition
| A blue-green pigment present in small amounts in all plants located in the leaf that specifically recceives the photoperiodic message. |
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Term
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Definition
| Plants that initiate flowering only when day length is below about 12 hours. |
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Term
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Definition
| The distance between successive peaks or troughs in the elctromagnetic spectrum. Wavelength is inversely proportionate to frequency |
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