|
Amendment |
Uses |
Comments |
|
Perlite |
Work
into heavy soils to improve drainage and
aeration and reduce compaction |
Expensive: lasts a long time best for
planters lightweight |
Sand
(coarse) |
Same
as perlite |
Less
expensive than perlite but required in large
quantities for substantial improvement of
clay - heavy weight - Must be coarse sand
and not fine textured sand. |
Topsoil (loam) |
Work
into very sandy soils to improve water and
nutrient holding |
Inexpensive but heavy may be contaminated with weed
seed, nematodes, fungi and other undesireable organisms
or chemical compounds. Know the source! |
Vermiculite |
Improves water and nutrient holding in sandy soils |
Expensive lightweight if soil is worked frequently, the structure
of the vermiculite will be damaged, reducing its
effectiveness. |
Scoria (lava rock, cinder rock) |
Same as perlite |
Less expensive than perlite but a bit
heavier in weight. |