6Chanyansak V K, Carbon H. Organic nitrogen ration in water extracts as a measure of compost degradation [ J ]. J Ferment Technol, 1981, 59: 215-221.
7Bernal M P, Paredes C, Cegarra M A J. Maturity and stability parameters of composts prepared with a wide range of organic wastes [J]. Bioresour Technol, 1998, 63:91 - 99.
8Hue N V, Liu J. Predicting compost stability [J]. Compost Sci & Utiliz, 1995, (3) : 8- 15.
9Garcia C, Hernaandez T, Fosta, et al. Evaluation of the maturity of municipal waste compost using simple chemical parameters [J]. Commun Soil Sci Plant Anal, 1992, 23:1501 - 1512.