Re: Cold weather and photosynthesis
That is why Pumpkins are often pale green early in the season then jumping to dark green after 1 or 2 days above 80. In poor heat conditions you must back off on feeding to prevent tender growth that will not tolerate heat & sun when it comes back. Windows help a great deal in poor heat conditions. My Pumpkins are vining and are in a make shift greenhouse made of storm windows. As long as there is sun they stay vigorous.
George
In a message dated Wed, 23 May 2001 9:52:35 AM Eastern Daylight Time, "Joe Ailts" <joea@pharmasan.com> writes:
<< <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN"> We are hitting rock bottom temperatureshere in the upper midwest. I thought I might add to the sickness with some hard-to-swallow photosynthesis observations. Science tells us that with every 10 degree increase in temperature, the rate of photosynthesis doubles. So lets say that pumpkin photosynthesisruns at 100% at 85 degrees.If this is a linear relationship, then every 10 degree drop in temperature correlates to a 50% drop in the rateof photosynthesis. Here's how the numbers stack up- 85 degrees- 100% 75 degrees- 50% 65 degrees- 25% 55 degrees- 12.5% 45 degrees- 6.25% 35 degrees- 3.13% 25 degrees- game over,man Yesterday in Central Wisconsin, the mercury never climbed above the 45 degree mark. OUCH. My poor babies. >>
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