A method for preparing a seaweed based soil enriching composition

摘要

A method for preparing a seaweed based soil enriching composition with phytotoxic compounds removed comprises chopping and soaking fresh seaweed in a dilute phosphoric acid aqueous solution of 10% volume, and then subsequently rinsing the seaweed with fresh water. The seaweed is chopped to have a maximum dimension of approximately 12mm and is soaked in the dilute phosphoric acid solution for a time period of approximately 20 minutes at room temperature. The rinsed chopped seaweed is then subjected to an alkaline extraction step for extracting humic acids therefrom suspended in liquid slurry. The liquid slurry is filtered for providing a liquid plant growth promoting composition, and the remaining sludge is mixed with seaweed meal for providing a soil conditioning composition.