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Can’t make your own home-made equivalent? If your recipe calls for 1kg of potassium hydroxide, use 3kg of wood ash, put it in a container that allows you to compact the ash and has holes in the bottom. For every 1kg of ash, run 3l of hot water through it. If you have the equipment to measure the pH, it should be around 13. Corn stalk and sunflower ash are good sources of potassium. Bamboo, as well as any other grass, is also excellent.

Be careful! Limestone raises the pH significantly, which causes nitrogen to volatilize in the form of ammonia, which is toxic to people and animals! It’s fine in soil, but in compost or especially in chicken manure, where there’s a lot of nitrogen, it can be dangerous! But after all, why would you want to put limestone on your poultry’s floor? Do you want a fertilizer with more calcium? It’s better to apply limestone directly to your soil.