powders of specific particle size, high productivity and versatile applications. By definition, âSpray drying is the transformation of feed from a fluid state into a dried. particulate form by spraying the feed into a hot drying medium.â (Masters, 1991) A spray dryer operates on convection mode.
Sometimes the grounds and maintenance department of a town or county creates mulch from trees that have been cut down and they make it available to the public. To lay a 4-inch-deep spread of bark mulch in a 300-square-foot area, a landscape or garden service will charge $425, which includes the material and labor. You can buy the mulch for $85 and do it yourself, and pocket a 80 percent saving.
Mulch Installation Costs. For professional mulch installation, you might pay anywhere between $160 and $270, although this wonât include the cost to buy or deliver mulch. This is determined by the square footage of area you need covered along with labor and delivery costs. Pine bark/needles: Use this loose mulch to help plant roots absorb and retain moisture. 2  You shouldnât use it if you live in wet or windy areas, though, because it easily blows away. 3  It costs about 10 to $12 per 2 cubic feet. 4  Straw/hay: You can purchase straw and hay for about $4 to $5 per bale.