Quote:
Originally Posted by JakeD[_7_]
What is the cheapest way to add potash and phosphorous (assuming I need
it)?
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Bonemeal is a relatively cheap way of adding phosphorus (correct spelling), and is slow release. Bones contain a lot of calcium phosphate. Also contains some nitrogen.
A really cheap method is to water the garden with grey water collected from your clothes washing machine, because there are phosphates in washing powder. Though this is not slow release.