I’m a newbie from Russia, just made my first window farm from scratch yesterday, inspired by Britta’s talk on TED.com I want to grow some rucula (=arugula) and dill, and maybe some other herbs which are quite expensive here (10 USD a kilo, 4.84 a pound).
I noticed almost everyone here uses some kind of brand-name nutrient mix, often it is in the liquid form. It seems difficult to find out the right stuff to use, since nutrient names may vary depending on the country.
So I bought some very basic stuff. One is called Nitrophoska, a dry (non-liquid) mix, and contains, as it name suggests, the following:
Nitrogen (N) 16%
Phosphorus P2O5 16%
Potassium K2O 16%
I have no idea what the remaining 100 – (16+16+16) = 52% are…
I also have another slightly more expensive nutrient powder mix which contains N 13%, P2O5 20%, K2O 20% and some B, Cu, Mn, Zn and Mg. The package says that it’s great for bell peppers, tomatoes and so on. I think I will try this one first, because it seems to me that the N, P, K are too few elements for producing tasty herbs.
Are these two mixes ok (for herbs), or should I increase/decrease some of the constituents share in the overall solution?
And a second question. I’ll be using clay pellets as soil. I could not find a clear instruction about how long does the air pump need running. Some leave it on 24/24h, while others turn it on for 15 minutes every 2 hours, and completely switch the pump off during the night (1:00 am – 7:00 am). What is the right thing to do for herbs, any suggestions?