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Allotment Stuff => The Basics => Topic started by: KevTetley on March 26, 2007, 21:06:52

Title: Polythene Cloches / Tunnels
Post by: KevTetley on March 26, 2007, 21:06:52

I have an alomost endless supply of large sheets of blue polythene.

Is it ok to use BLUE ploythene to make polytunnels  / cloches or will it be restricitive to the light?

Thanks

K

Title: Re: Polythene Cloches / Tunnels
Post by: Robert_Brenchley on March 26, 2007, 23:00:24

Not only does it cut off a great deal of light, but a lot of it (maybe all? I'm not sure) disintegrates in sunlight, and you get nasty little bits scattered all over the garden.

Title: Re: Polythene Cloches / Tunnels
Post by: Si on March 26, 2007, 23:54:48

Plants absorb blue and red light for use in photosynthesis. Green light is reflected because the plants cannot use it to make food. If you put a blue polythene sheet over your plants, it could act as a filter and block the useful blue light!

Title: Re: Polythene Cloches / Tunnels
Post by: KevTetley on March 27, 2007, 10:19:53

Excellent - I remembr my A level Biology now!! 

Thanks