Originally Posted by philipraposo1982
For k2so4 and kh2po4 and my micros, can I make them in a 500ml or a 1l bottle?
How long do they stay good for? Fridge or room temp? Clear bottle or not?
Does this use up more dry salts in the end?
Absolutely and they will keep. Macros are easy and will keep. I buy name brand for the micros personally, but I know a lot of people that do make them. Fungus can be an issue on some dry micro brands, but these can be resolved with refrigeration, type of container (limiting light exposure) and limiting shelf time.
There are a number of calculators out there that will help you make your mixtures. This is one that a member made here years ago.
Don't confuse yourself with numbers. This is the process for determining how to make the mixture.
Figure out what ppm you are looking to achieve of the each nutrient of the fertilizer you are adding per dose (think as if you were just going to dose dry).
What is your target N, P, K.
Then, using the mixing bottle you are looking to use, determine what is the easiest volume of solution that is convenient for you to dose. There are a lot of nifty containers out there, some with interiors dosing volume areas.
I personally dose my ferts in 15 ml volumes. So I set all of my intended dry dosage to that volume. So, for a 900 ml container, I get 60 doses. I just multiply the daily dosage by 60 and add to the container. You are done. The calculator I linked you too will give you assistance with this, but you should understand what it is doing.
I recommend you getting a scale. Makes things a lot easier to measure than just fractions of teaspoons.
Hope this helped.