Sulfur requirements in orchids.

[Georg Luiz Barth]

Dear orchidists, in your opinion....what would be the ideal percentage by weight of sulfur in the composition of nutrients for orchids? I noticed that this is not clearly specified on the fertilizer packaging labels. My culture is done in semi hydroponics, applying weekly 100 ppmN or 25 ppmN every other day. I use tap water with a TDS 30 ppm. My current base composition (home made) is: 13N - 3P - 6K - 8 Ca - 1.5 Mg - 0.6S - 0.3 micro element mix. Nitrogen (nitric) participates with 86% of the total nitrogen and nitrogen (ammoniacal) participates with 14%. This composition, applied at a concentration of 100ppm of total nitrogen, provides: 10ppmP//38ppmK//61ppmCa//11.5ppmMg//5ppmS and 2.3ppm of a mix of micro elements. Please... constructive criticism about the mentioned composition is also welcome.

[Ray]

Looking at the sulfur provided by the various sulfates used in the formulation of some commercial fertilizers (Dyna-Gro Grow/Bloom, MSU Well/RO, & K-Lite) it seems to vary from 0.05 to 0.09% of the fertilizer dry composition.

[Georg Luiz Barth]

Originally Posted by Ray

Looking at the sulfur provided by the various sulfates used in the formulation of some commercial fertilizers (Dyna-Gro Grow/Bloom, MSU Well/RO, & K-Lite) it seems to vary from 0.05 to 0.09% of the fertilizer dry composition.

Really Ray.... amount practically at the level of micro elements. I'm using six to seven times the content you searched for. I can fix this easily and maybe eliminate the small problem of salt precipitation in my concentrated solution. Calcium nitrate is reacting with magnesium sulfate. I think I'm going to eliminate the magnesium sulfate and let the sulfates that make up the microelement mix provide that small amount of sulfur.

[Georg Luiz Barth]

Oops...I'm using a cell phone instead of the computer. The letters and the fields are too small and I ended up wrong in the post. I'm sorry.

---------- Post added at 09:49 PM ---------- Previous post was at 09:25 PM ----------

Thanks. I would like to see the video..but I don't see the link in your post gardenguru2. Please check...

---------- Post added at 09:50 PM ---------- Previous post was at 09:49 PM ----------

Thanks. I would like to see the video..but I don't see the link in your post gardenguru2. Please check...