Foamed glass - used as chemical carrier medium esp. for delayed release of artificial fertiliser

摘要

Foamed glass, as carrier medium for agricultural chemicals, is claimed. The chemical additive is added during prodn. of the foamed glass so that it forms granules around the foam bubbles, aggregates baked onto the bubble walls or inclusions distributed thorughout the glass. The additive is pref. an artificial fertiliser or a precursor which forms a fertiliser during the glass melting or foaming phase. The additive may evolve the gas required for foaming the glass. USE/ADVANTAGE - The foamed glass is used as a carrier medium for artificial fertilisers, including phosphate, nitrogen and multicomponent fertilisers. It provides delayed release dependent on the nature of the fertiliser inclusions and on weather influences (e.g. freeze-thaw cycles) and timed according to plant growth needs