Fourth different composts (C1, C2, C3 and C4) were prepared using wastes: rice straw, cattle dung, mineral and natural additives and microbial inoculants. Data showed biological and chemical properties as following: Methophilic bacteria decreased during the first 4 weeks of composting periods then increased gradually reaching to maximum after 8 weeks. C4 had recorded the highest number 150.52 x 108 cfu/g, in contrast the thermophilic bacteria at initial time were found in numbers lower than those of mesophilic bacteria, thermophlies bacteria was between 8.45 – 78.14x107cfu/g for mixtures C1 and C4. Mesophilic fungi was slightly increased reached maximum at 8 weeks of processing, while thermophilic fungi counts show maximum at the second weeks reached to 127.88 x106 cfu/g in C4. Mesophilic actinomycete numbers were dropped during the first four weeks and then increased gradually reached to maximum after 8 weeks. On the other hand thermophilic actinomycete numbers reached to maximum after composting for two weeks. Data show filter paper cellulase activity (FP- ase) achieved best result in C2 and C4. Whlie carboxy methyl cellulase activity (CMC ase) recorded high result in C1,C2 and C3 in 16 week but C4 in 8 week generally, β- glucosidase activity achieved good result 16 week C1, C4 while C2 and C3 in 12 week. The loss percentages of lignin are in general lower than those of hemicellulose and cellulose during the composting course for all compost piles. The degradation order of hemicellulose > cellulose > lignin. Also data show that fulvic acid percentages increased in initial periods then less graduallyin final periods. On the other hand humic acids percentages were low initial then increased gradually even reach maximum values in final compost periods.
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