Growing Potato

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18 Sep 21 Mike Val. (Australia - temperate climate)
Query re coffee grounds - I have been composting for a few good years now, and I am fairly sure that if coffee grounds are left out on a plastic or concrete surface in sunlight for a month+ it will accelerate its breakdown and can be incorporated into the soil. If you are on good terms with a local cafeteria or coffee shop, their daily throw-out will astound you. Have incorporated this into my composting regime for some years now and grow some impressive veg. The trick is in the dry composting of the grounds before incorporating it into the larger composting mix. Give it a go !
28 Sep 21 Anon (Australia - tropical climate)
I beg to differ. For anything to breakdown (to decompose) it needs air, water, carbon and nitrogen. Most things have a mix of carbon and nitrogen. Greens more nitrogen and dry things more carbon. You use grindings as a nitrogen source. By placing it out in the sun and drying I would think you are losing some of the nitrogen. It is like fresh manure would have more N than old manure. Placing grindings straight into soil is not recommended, it has to break down first. For good compost you need a big pile 1200-1500mm high, a good mix of N and C and for it to be watered and turned regularly. By doing this you create the heat to activate the bacteria etc to break the ingrediencies down. Compost is a great soil conditioner, it has very limited N P K.
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