Growstones ideal alternative to perlite, parboiled rice hulls

A study determined the properties of an aggregate produced from ground waste glass and compared the component with perlite and parboiled rice hulls. Experiments determined how Growstones affected root substrate properties and evaluated plant growth in different substrates. Results showed that Growstones had an air-filled pore space higher than that of both peat and perlite, and that Growstones added to peat at a concentration of at least 15 percent increased AFP of the peat-based substrate.

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