Phosphatase and urease instability caused by pesticides present in soil improved by grounded rice straw.

Phosphatase and urease were involved to the mineralization of phosphorus and nitrogen compound in soil. In this observation, these enzymes examined through 12 weeks incubation of the soil containing pesticide and compared to free pesticide one. The treatment executed in greenhouse for incubation. Phosphatase had been lower activity compared to urease of all action. These activities fluctuated in the beginning and decline to 12 weeks incubation. Phosphatase and urease increased in 2 weeks incubation, 2.45 and 49.25 unit/g soils, respectively. Urease was more responsive to soil containing pesticide evaluated to phosphatase activity. Carbon dioxide release as caused of soil microbial respiration most advantageous at 4 weeks incubation in soil free (B soil; 2.96 mg/g/hour) and long-lasting healing with pesticide (A soil; 2.55 mg/g/hour), compared to the soil containing fresh pesticides which was peaked later at 6 week incubation (1.82 mg/g/hour). Organic substance (grounded rice straw) amended into soil was strongly to implicate respiration rate, phosphatase, and urease activities concerning to soil containing pesticide. The result should make representative work in effort to evaluate phosphatase and urease related to mineralization process within and without pesticide degradation in soil, as well as caused by rice straw organic compound augmentation to the soil containing pesticide.