Why alum, not biochar?

Ballance hits half way in product innovation programme

… “One example of a product concept which hasn’t made it to the next round was the potential of alum to mitigate phosphorus runoff losses from pastures to waterways.

“It is used successfully in water treatment, but for mitigation of phosphorus runoff the effective rates proved to be cost prohibitive.”

Nearly $20M for conventional fertiliser research but no room for biochar trials in NZ?


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