#### treefrog

##### Well-Known Member

I everyone, I think I need help to prepare my fertilizer solution. Note that, being in French Guiana, the availability of fertilizers is very limited, hence the importance of preparing my own formula for orchids.

So, what I did so far (with what I could find) is:

1 - Use a 15/5/30 + 5Mg + 10So4 already prepared water soluble fertilizers as the base (normally used for orchards).

2- Using the First Ray K-Lite Knock-Off” Calculator, I figured out that if I add 1 part of this base fertilizer + 2 parts of calcium nitrate + 2 parts of Epson Salt I would get a => 9.8/1/6+ 9.8Ca +4.9Mg (pretty close to the final 9.1 – 0.9 – 4.6 – 10.3Ca – 4.5Mg Do-It-Yourself K-Lite presented on the same page. I make and use this knock-off mix by mixing 125g of the base fertilizer + 250g of calcium nitrate + 250g Epson salt. I then mix the powder into a 25L water bucket (this should give me a 2500ppm of N) and use an injector at 1% to provide 25%ppm at each watering. Note that my mother solution remains powdery with some undissolved elements in it (if someone has a solution for me to have a perfectly dissolved mix?).

3 – Now, all is missing are the microelement (not present in the base fertilizer)! I found a product called ‘Tradecorp AZ’ which is a chelated formulation of:

Fe 7.50%

Mn 3.50%

Zn 0.70%

Cu 0.28%

B 0.65%

Mo 0.30%

And now, I begin to be lost! Could someone explain and suggest a proportion/quantity of this microelement mix I should add to my mother solution (the one at 2500ppm N)?

Thank you in advance for your help!

Math

So, what I did so far (with what I could find) is:

1 - Use a 15/5/30 + 5Mg + 10So4 already prepared water soluble fertilizers as the base (normally used for orchards).

2- Using the First Ray K-Lite Knock-Off” Calculator, I figured out that if I add 1 part of this base fertilizer + 2 parts of calcium nitrate + 2 parts of Epson Salt I would get a => 9.8/1/6+ 9.8Ca +4.9Mg (pretty close to the final 9.1 – 0.9 – 4.6 – 10.3Ca – 4.5Mg Do-It-Yourself K-Lite presented on the same page. I make and use this knock-off mix by mixing 125g of the base fertilizer + 250g of calcium nitrate + 250g Epson salt. I then mix the powder into a 25L water bucket (this should give me a 2500ppm of N) and use an injector at 1% to provide 25%ppm at each watering. Note that my mother solution remains powdery with some undissolved elements in it (if someone has a solution for me to have a perfectly dissolved mix?).

3 – Now, all is missing are the microelement (not present in the base fertilizer)! I found a product called ‘Tradecorp AZ’ which is a chelated formulation of:

Fe 7.50%

Mn 3.50%

Zn 0.70%

Cu 0.28%

B 0.65%

Mo 0.30%

And now, I begin to be lost! Could someone explain and suggest a proportion/quantity of this microelement mix I should add to my mother solution (the one at 2500ppm N)?

Thank you in advance for your help!

Math

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