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Old 01-08-2009, 03:41 PM   #8 (permalink)
Nicolas Naranja
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Default Re: Banana Growing Degree Days

Quote:
Originally Posted by damaclese View Post
living in Vegas i get both the bottom and top of the temp range. about 100 they slow down dramatically. they don't stop growing they just grow slowly. at the high point for this last year was 119 here in Vegas they were putting on a leaf about ever two weeks and are humidity is ruffly 15%. now in the house were they don't get that kind of temps but have allot lower light. they grow sorta in spurts a leaf a week for several weeks then nothing for a cuple if not three weeks. its been throw my observations that the rate of growth is more effected by UV then by temps. here in the south west we get the UV index every morning and the hotter it is the higher the UV. when the UV is over 10 they hardly grow at all unless there in shade. believe it or not my Bananas that are in shade grow faster then the ones in sun shaded light is vary high in blue light theres a thread on growe under lights i think you all should check out. so i know its sounds like if strade from the main topic but really light is more important them temps to a point.
I worked for a plant physiologist a few years ago, and have a Master's in Agronomy, my expertise however is not bananas. However, plants in general respond to evaporative demand which is based on heat and humidity and if evaporative demand is high the stomata will close and the plants growth will cease. Another issue related to the UV light that you mentioned might very well have to do with photorespiration which is the wasteful evolution of carbon dioxide due to sunlight in C3 plants.
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