Ok, I see. I know my pepper plants are in need of nitrogen. I’m doing all container gardening. I don’t have the option for in ground or raised bed at the moment. I also have tomatoes, lettuce, kale, cabbage, chard and okra. I know the tomatoes and peppers have different fertilization needs so I thought I would need two different kinds
I'm in a similar situation, struggling to get my head around container gardening.
I use a no dig approach in my beds - essentially all that's required is an inch or two of garden compost added to the beds each December - that's it!! No amendments or fertilizer needed (except possibly amending ph level for potatoes vs brassicas).
I love the simplicity and the fact that you don't need to spend a penny (or cent).
Containers are a different beast though. I've done well enough, but my approach has been to spend a small fortune on store bought compost and refreshing with new each year. This store bought compost is full of slow release fertilizer.
I need to use a lot of containers as we have huge patio areas in the sunniest spots. Thus far, I've established that containers do best when you can cut the bottoms out and place them on soil - it doesn't matter how awful the soil is. I'm not sure why this makes a difference, but it kind of turns it into a raised bed. But on my patio I simply can't do this. I'd be willing to take up some slabs, but there's a couple of feet of rubble underneath them.
@Oliver Buckle can give you good advice for making completely free potting soil - although that's UK climate.
I'm leaning towards a mix of garden compost, leaf mould (to hold moisture - thanks oliver), manure and possibly using
@Chuck and
@Meadowlark's container hugelculture (sp??) approach. Oliver has also talked about 'baking' clay soil to create a powder which sounds interesting as when I add my garden soil it just clumps and separates from the other ingredients.
I know that in-ground, no dig gardening works beautifully because you feed the soil, and that creates soil life that feeds the plants. This works - 1 zillion percent. But I'm not sure how (or if you can) get this working in containers that aren't in contact with the soil. Can you create a little 'ecosystem' in a pot that's self-sustaining provided you keep the soil fed? The trouble is, if it dries out just once or gets too hot presumably you'll kill off the soil life.