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David Granatstein, Washington State University, recommends growers consider the following before using a mulch.

• What is the volume needed? Using a 3-foot strip under the vine, an inch deep would equal 44 cubic yards per acre.

• What is the bulk density?

• What are you bringing in? Run a chemical analysis on the dry material.

• How much nitrogen is released and when is it released?

• What are the long-term effects?

• Are there contaminants, weed seeds, pathogens, or odors? Chicken manures can contain arsenic.

• What is the material’s longevity?

• What is the impact on soil pH and soil electrical conductivity? Mulches that add high salts can kill trees and vines.

• What is the cost for transporting and spreading? Mulches are bulky and can be expensive to spread. WSU estimated that it costs around $900 per acre to buy, shuttle, and spread mulch in an orchard.