I had my veggie garden soil tested last year and followed the university extension recommendations by adding nitrogen (blood meal) and potassium (sul-po-mag). So far, the plants have responded well and things are growing quite nicely. As I plan for next year, how likely is it that I will need a similar amount of amendments? Will some of what I added remain or will my chard/lettuce/tomato/cucumber/beets deplete it completely?
you will most likely need to refresh the soil as you have done this year. cucumbers specifically are very heavy feeders so you might need to do a full replenish there. for lettuce or beets maybe half of what you did this year would work since the nutrients (some) would remain as they are less demanding plants.