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  2. Cold hardening - Wikipedia

    en.wikipedia.org/wiki/Cold_hardening

    Light doesn't control the onset of cold hardening directly, but shortening of daylight is associated with fall, and starts production of reactive oxygen species and excitation of photosystem 2, which influences low-temp signal transduction mechanisms. Plants with compromised perception of day length have compromised cold acclimation.

  3. Here's what you need to know to place grow lights at the right distance, depending on the type of light and the plants you're growing. Related: ...

  4. Smudge pot - Wikipedia

    en.wikipedia.org/wiki/Smudge_pot

    A smudge pot (also known as a choofa or orchard heater) is an oil-burning device used to prevent frost on fruit trees. Usually a smudge pot has a large round base with a chimney coming out of the middle of the base. The smudge pot is placed between trees in an orchard. The burning oil creates heat, smoke, carbon dioxide, and water vapor.

  5. Physiological plant disorder - Wikipedia

    en.wikipedia.org/wiki/Physiological_plant_disorder

    Many annual plants, or plants grown in frost free areas, can suffer from damage when the air temperature drops below 40 degrees Fahrenheit (4 degrees Celsius). Tropical plants may begin to experience cold damage when the temperature is 42 to 48 °F (5 to 9 °C), symptoms include wilting of the top of the stems and/or leaves, and blackening or ...

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  7. Fresno freezing temps: How to prepare your plants, pipes and ...

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  8. Oil well control - Wikipedia

    en.wikipedia.org/wiki/Oil_well_control

    Secondary oil well control is done after the Primary oil well control has failed to prevent formation fluids from entering the wellbore. This process uses "blow out preventer", a BOP, to prevent the escape of wellbore fluids from the well. As the rams and choke of the BOP remain closed, a pressure built up test is carried out and a kill mud ...

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