I know what Paul recommended and what can be found on line, but just want to compare notes with each of you.
Sent from my iPad using Tapatalk
1/2 acre plots and 50lb bags make it easy. Each bag gives the full credit. Example a 50lb bag of 17-17-17 spread over a 1/2 acre gives 17 N credits, 17 P credits, and 17 K credits.we are all pretty smart here, but I'll toss this in just in case....... when we talk fert, I see folks using tripple 19, 46 0 0........ when it all comes down to it, we should keep in mind the content of what we are using, those numbers mean something, and it is easy to forget and just go at a bags per acre, but in reality, there is a big difference. lets say you have 20 20 20, and want 40 lbs of N per acre..... it is way to easy to grab 2 50 lb bags and think you are doing it right. but that is only half of what you are trying to apply, 100 lbs of 20 20 20 only adds 20 lbs N to the plot, you would need 4 bags. if I am babbling, let me know, otherwise, just trying to help.
I kinda go at it differently. I don't fertilize the crop. When I do use fertilizer it's because my soil reserves of P & K need a boost. Now, what that means to you might be different than what it does for me. It also depends on the soil you have to work with. Generally I want to keep the phosphorous levels between 40 and 60 lbs per acre and K between 130 and 180 lbs per acre. That put's P at what might be considered below optimum, but that's ok. Potassium seems to be my limiting nutrient. So, it gets a little more attention.
What amount of nitrogen I might apply depends on what the plants look like after they get out of the ground, what the last crop was, the organic matter in the soil. Brassicas respond well to nitrogen, but I have enough plot space that I'll add a little extra area instead of trying to squeeze a big yield out of a small space.
Now, to answer the question, the practical solution for me is 300 lbs of 19-19-19 per acre. In round numbers, 60 lbs N, 60 lbs of P and 60 lbs of K. Too much P and not enough K, but on average life is just perfect!