New heat-expanded minerals of high water-holding capacity—good aids in plant propagation
V. T. Stoutemyer
California Agriculture 1(10):4-4. DOI: 10.3733/ca.v001n10p4b.
V. T. Stoutemyer is Professor of Ornamental Horticulture and Plant Physiologist in the Experiment Station, Los Angeles.
Not available – first paragraph follows:
Recently two relatively inert mineral substances have been tested which appear to have numerous uses in plant growing, especially in operations connected with plant propagation. These are heat-expanded vermiculite and perlite.