The study was conducted in the laboratories of the Department of Plant Protection in the Faculty of Agriculture – University of Kufa to test the efficacy of enzymes (Exoglucanase, Laccase, CMCase and Pectinase) in the crusts of rice straw, Johnson grass and Field bind weed alone which incubated with fungus Pleurotus ostreatus for two periods of 20 and 40 days at a temperature 25 °C. The results showed a significant improvement in the efficiency of all four enzymes when mixed with fungi compared to the plant residues alone, treatments were less effective for all incubation factors with Pleurotus ostreatus after 40 days compared to 20 days of incubation except for the lactase enzyme with the spandex plant.
 

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