Re: Technical Question

Gary,
     This year I used a cheap, clear paint drop cloth for my cold frames.  One was 12' x 4' (I only let the main vine grow on the plant in this one) and the other was 8' x 8'.  I planted the one in the 8 x 8 two weeks before the one in the 12 x 4, so the plant was sprawling everywhere out side of the cold frame way before the one in the 12 x 4 was even close to out growing the cold frame.  
     No burning occurred for awhile until early summer and when it started to occur it was on the tips that were light green that out grown the 8 x 8 greenhouse.  The one in the 12 x 4 greenhouse hadn't out grown its greenhouse yet and didn't show any burning.  In early July the day came when the tip protruded out of the greenhouse and two days later the tip had gotten so burned that it looked like someone had taken a lighter to it.
     My theory is that the cheap drop cloth somehow protected the leaves from burning.  I also noticed that more burning occurred when the UV factor was higher.  Could it be that because the drop cloth was not UV stablized that it absorbed UV rays and didn't allow any UV rays to burn the leave?  I'm not sure but I know I will use cheap, clear drop cloths next instead of expensive shade cloths.
     I live in Ohio so I don't have to normally worry about extreme temperatures (+95 degrees) so I'm not sure if temperatures above 95 would cause burning.  Please correct me if you see anything that isn't right.           

Grow'em Big,
Josh Jackson
 
second year grower - ( personal best 451.5 2000 )
j*@juno.com    -    http://mypumpkinpage.homestead.com/mypumpkinpage.html
 
 
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On Sun, 4 Nov 2001 00:09:06 EST S*@aol.com writes:

I am in the process of developing a new shading and misting system for next year and I need to know what causes pumpkin leaves to burn. Is it air temperature? Or sun rays? Or both? I also have noticed that pumpkin leaves that are shaded a little grow much bigger. Why do you think this is so? Has any one else noticed this?
Gary Faulk
Napa Ca
New Personal Best 611 lbs
 
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