TABLE 1

Main characteristics of the treatments used in the plant assays

TreatmentCodeComposition and composting procedureComposting time
Assay 1Assay 2
Unamended controlUCNo organic amendment was added
Almond shellsASCommercial almond shells derived from almond industry were piled and traditionally composted; the compost pile was only watered with rainwater5 yr1 yr
Pruning wastePWAvocado wood derived from pruning waste was finely chopped and composted; the compost pile was watered and turned for aeration every month5 mo5 mo
Yard wasteYWYard and garden wastes (mostly grass) collected from gardens of the area and composted; the compost pile was watered and turned for aeration every month5 mo5 mo