fetida and 6.1–15.0 kg m -2 of GWC were applied. The model predicted that the total salt content of the saline soil would decrease by > 2 g kg -1 ( p<0.05) when 29–90 individuals m -2 of E. fetida added per m 2, and x 2 is the quantity of GWC added in kg per m 2. The data from the field experiment were described by the following second-order model:, where y is the decrease in soil salinity (g of salt per kg of dry soil) relative to the untreated control, x 1 is the number of E. fetida survived in GWC-amended saline soil and increased the contents of humic acid, available N, and available P in the GWC-amended soil. fetida and green waste compost (GWC) on the salt content of the soil. A laboratory microcosm experiment was conducted to determine whether the earthworm Eisenia fetida could survive in a saline soil from a field site in North China, and an experiment using response surface methodology was conducted at that field site to quantify the effects of E.
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