Have just read 'Natural Farming and Land Care' by Pat Coleby who farmed in Australia from 1959. She studied mineral deficiencies, which are widespread there, either natural or man-made, and cured many crop and livestock ailments and pest problems by adding minerals to feeds or top dressing.
Maynard Murrays 'Sea Energy' documents his trials feeding and applying seawater or solids from evaporated seawater resulting in a range of improvements from yield and weight gain, flavour enhancement, reduction in pests and parasites to prevention of cancers. This is 'free' fertiliser with a balanced and complete mineral content and apparently in this form the salt doesnt harm the land or the plants.
So Ive dressed with gypsum, which adds calcium and sulphur and breaks up clay, dolomite which adds calcium and magnesium, lime to counteract the acidity of the coffee grounds and compost, and blood and bone to supply nitrogen and speed up decomposition. Will add more seaweed this week.