Interesting question! In fact, 30cm depth is way more than you need for a large area, even beds to plant straight into need no more than 12-15cm – and generally if you have grass (suggesting reasonable fertility underneath), 5-7cm of manure will be plenty, with some cardboard/plastic on top. There is no precise answer, it depends what you plan. To cover the whole plot with 5cm would require about five tonnes I think, but it depends how dense and wet the manure is. Order more than you think to need as a big pile is used so quickly. And keep us posted!
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