yellow leaf

[airdalecv66]

Hi, new to forum, greenhouse (fully hydroponic) is 40' X 90' x 25' peak roof, with 850 month old tomato's. starting to show slight signs of 'yellow' leaf on some of the plants, research indicates lack of iron ? also doing self pollination, would blue nose fly do a better job than 100 bumble bee's ?

Thanks for any and all idea's.


https://www.facebook.com/pages/Seren...34767976548426

[GpsFrontier]

I think you are referring to blue bottle fly's. I don't think they would be better than bumble bees, but they would complement the work the bumble bees are doing. Also good air circulation would help a great deal for pollination too. How are you dong/monitoring your nutrient solution? Have you changed it yet? Are you replacing the nutrients/elements the plants deplete from it? If so what are you adding and how much? Also what size is your reservoir.

[airdalecv66]

Thanks for the reply, yellow leaf problem has cleared up, reservoir is 300 gal.
plants are doing great. (bumble bee's arrive today).
again, thanks.