Effects of different ratios of Pholiota nameko residue to pig manure on compost humus composition

Objective  To explore the effects of different fertilization ratios on compost humus composition.

Method  Pholiota nameko residue was selected as the basic material. Different proportions of pig manure were added to analyze humus structure, and screen the best ratio of P. nameko residue to pig manure while composting organic fertilizer.

Result  In the compost with different ratios of P. nameko residue to pig manure, the contents of water soluble organic matter and humic acid carbon all decreased firstly and then increased slowly as the composting process continued. The ratios of humic acid to fulvic acid (C_HA/ C_FA) all decreased significantly on the 15th day, and then increased. C_HA/C_FA in treatment Ⅰ, Ⅱ, Ⅲ, Ⅳ and Ⅴ(the mass ratios of P. nameko residue to pig manure were 0︰10, 1︰9, 3︰7, 5︰5 and 7︰3) were significantly higher than the initial values, being 7.14, 3.23, 1.22, 4.38 and 2.52 times of the initial values respectively. C_HA/ C_FA in treatment Ⅳ was the best level. Meanwhile, the carbon content of humin in treatment Ⅳ was higher than those in other treatments.

Conclusion  In compost with different proportions of P. nameko residue and pig manure, the organic carbon contents are more beneficial, and the humus composition contents and soil fertility are improved, as compared with using P. nameko residue or pig manure alone. Under the appropriate proportions of P. nameko residue and pig manure, the polymerization and humification degrees of soil humus improve with the increase of C_HA/C_FA. Organic material can improve the humus content of each combination form and the structure of soil organic matter, and the effect is better than other treatments when the ratio of P. nameko residue to pig manure is 5︰5.