Does topsoil have more salts than the subsoil below, even in organics sometimes? Does tilling the top layer of soil release more salts than tilling the same amount of subsoil? If anyone has any thoughts or info, it would be greatly appreciated. I am working on a no-till project with sunflowers, mustard seeds, and peas and am trying to figure out if tilling just the top layer of soil, barely breaking into the subsoil, is enough to release excessive salts possibly. More context: my concern is the topsoil and subsoil (6-8 inches down) primarily, both of which are very dynamic and complicated regions.
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