Elizabeth Worobel said....
>Well, here is my 0.02c (CDN) worth on the subject of DIY micronutrient
>fertilizers: Fe 1.0, B 0.98, Mn 0.10, Zn 0.09, Mo 0.08, Cu 0.004 and Co
>0.004. These values are are all compared to Fe which is added as an EDTA
>chelate twice a week at 0.45 uM. Currently I mix up the stock solution so
>that I need 0.5 ml per liter. I am experimenting with a 5x solution where
>I would only need 0.1 ml per liter ... it gets tiresome mixing
>micronutrients every few months. Unfortunately, this gets close to the
>solubility of EDTA (0.1 M) so Im having some trouble dissolving the EDTA.
>This mix was originally designed to grow duckweeds in the lab. Using it
>(and other optimal conditions) Lemna trisulca would routinely double its
>biomass every 2 days and at times every 1.5 days.
>The chemicals for this type of mix are cheap. I estimate it costs
>about 12 dollars to produce 4 L of a 5X micronutrient mix (1 ml per 10
>liters twice a week). For my setup, this would last about 15 months.
Would you explain how you arrived at the proportions of the constituents
in your feed? Was it trial and error, or is there a standard solution
used by people in your field? Has duckweed different requirements from
other types of aquatic plants or from terrestrials for that matter?
0.45 uM twice a week -wouldn't that be about 0.025 ppm as Fe? Not a lot,
yes? That's good growth. You could cover Lake Winnipeg in duckweed by
Karl Schoeler said...
>If anyone has the chance to visit Toronto, a "must see" is Aquarium
>Services main store. The plant display was the best I've ever seen in a
>a store setting. Most of the plants were potted, and from Tropica. This
>store ranks even with Hoffers' in Milwaukee, Wisc. Both have excellent
If that is a setup with the series of cascades within a long large
divided tank several of the stores in the franchise have installed them.
I've bought a few plants from them here in Ottawa.
Dave Whittaker ac554 at FreeNet_Carleton.CA
Gloucester, Ontario dwhitt at magmacom_com