After pulling out spent beans & tomatoes a few days ago, I started readying those spots for fall plants. I like to add more compost, a bit of organic fertilizer, and lime, depending on how each block looks (not very scientific or orderly), 
but some vegetables are more demanding than others, and almost all vegetables are much more fussy than the tough perennials, shrubs, and trees that we like to grow in our garden.Spinach (along with beets and chard) prefer a much more neutral soil (almost 6.5-7.0) than ours tend to be here in the SE,
so adding more lime is helpful, at least over the long run, although it would have been best to have added it some months ago! 
Pelletized lime is the easiest to use in the garden.In fact, one of the harder things I've had to learn about vegetable-growing is that vegetables tend to be nutrient and water 'hogs' -- and have generally been selected to grow tasty fruits and leaves for us to consume, and take up plenty of nutrients and water in the process.
