Abstract:

Under three different lime levels, effects of bioorganic fertilizer on soil nutrient content, biological activity and yield and quality of cassava were investigated using field experiments. The results showed that: compared to only chemical fertilizer treatment, 50% bioorganic fertilizer treatment increased soil organic matter content, available K content, invertase activity, bacterium, fungus and actinomyces by 12.5%, 36.7%, 26.8%, 21.4%, 41.8% and 48.4%. And 25% of bioorganic fertilizer treatment increased the fresh yield by 18.4% and starch yield by 17.9%. Thus bioorganic fertilizer increased the organic matter and available K contents, microorganism numbers and invertase activity in soil, and increased fresh cassava yield and starch yield. Lime treatment increased the bacterium and actinomyces numbers in soil, but decreased organic matter, available N and K contents in soil.