- Obama’s War on PotBack when he was running for president in 2008, Barack Obama insisted that medical marijuana was an issue best left to state and local governments. “I’m not going to be using Justice Department resources to try to circumvent state laws on this issue,” he vowed, promising an end to the Bush administration’s high-profile raids on […]
- Legislators To Review Distribution of MarijuanaThe use of medical marijuana in Maryland and how a statewide system could legally provide patient access are once again before the General Assembly, with three bills filed in recent weeks — each proposing a very different system for dispensing and distribution of the drug. Though federal law criminalizes the use of the drug, some […]
- Struggling Cities Turn To a Crop for CashAs the stubborn economic downturn has forced this city to take painful steps to balance its budget in recent years, it has increasingly turned to one of its newer industries to raise much-needed revenues: medical marijuana dispensaries. The city has raised taxes on marijuana dispensaries several times in the past few years, and last year […]
- Initiative To Legalize Marijuana Will Go To VotersAn initiative seeking to legalize and regulate the recreational use of marijuana will be decided by voters, Washington state lawmakers said Thursday. If passed, Initiative 502 would make Washington the first state to legalize the recreational use of marijuana. It would place the state at odds with federal law, which bans marijuana use of all […]
For the production of cannabis plant the largest environmental interaction / understanding the influence of photoperiod. The photoperiod is the daily number of hours of the day (light) vs. night (dark). In nature, long nights signal the plant that winter is coming and it is time for flowers and seeds. As long as the daily duration is long, the plants continue vegetative growth. If female flowers appear, there will be only a couple. These flowers will not feature the large clusters or buds. If the days are too short, early flowering, and remain undeveloped.
The cannabis plant “senses” the longer nights by a direct interaction with light. A flowering hormone is present during all stages of growth. This hormone is sensitive to light and is rendered inactive by even low levels of light. When the dark periods are long enough, the hormones increase to a critical level that triggers the reproductive cycle. Vegetative growth ends and flowering.
The natural photoperiod changes with the seasons. In the northern hemisphere, the longest duration of daylight on June 21. day length gradually decreases until it reaches at the 22 December. The duration of daylight begins to grow until the tour ends June 21 Since the Earth is tilted on its axis the sun, the day-length also depends on the position (or width) of the planet. As we move closer to the equator, changes in the photoperiod are less severe during the year. Equator (0 degrees altitude) day length is about 12.5 hours of 21 June 22, and 11.5 hours in December. Maine (about 45 degrees north), day length varies from about 16 and not more than nine hours. Near the Arctic Circe on June 21 is not night. 22. December, the day is dark. Duration of longest day to the block north of cannabis flowering until later in the season.
Over most of the northern half of the country, flowering is often so late that development can not be completed before the cold weather and heavy frosts.
The actual length of day largely depends on local conditions, such as cloud cover, altitude, and terrain. On a flat Midwest plain, the effective length of day is about 30 minutes longer than sunrise to sunset. In practical terms, it is little help to calculate the photoperiod, but it is important to realise how it affects the plants and how you can use it to your advantage.
Cannabis life cycle generally needs about two weeks of successive long nights before the first flowers appear. The photoperiod necessary for flowering will vary slight with (1) the variety, (2) the age of the plant, (3) its sex, and (4) growing conditions.
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