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Re: Micronutrients
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.
>
>Dr. dave.
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
Labour Day.
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
>plant departments.
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
Canada