Effects of selective microbial inhibitors on the microbial transformation of phosphorous in aggregates of highly weathered red soil with rice straw amendment

• Published in: Ying yong sheng tai xue bao Vol. 21; no. 7; p. 1759
• Main Authors: Ding, Long-jun, Xiao, He-ai, Wu, Jin-shui, Ge, Ti-da
• Format: Journal Article
• Language: Chinese
• Published: China 01.07.2010
• Subjects: Agriculture - methods; Anti-Infective Agents - pharmacology; Bacteria - drug effects; Bacteria - metabolism; Biotransformation; Fertilizers; Fungi - drug effects; Fungi - metabolism; Oryza - chemistry; Oryza - growth & development; Phosphorus - chemistry; Phosphorus - metabolism; Plant Stems - chemistry; Refuse Disposal - methods; Soil - analysis; Soil Microbiology
• ISSN: 1001-9332

In order to further understand the mechanisms of microbial immobilization of phosphorous (P) in highly weathered red soil with organic amendment, an incubation test was conducted to investigate the roles of microbial functional groups in the transformation of P in 0.2-2 mm soil aggregates. Throughout the 90-day incubation period, amendment with rice straw induced a substantial increase in the amounts of microbial biomass C and P, Olsen-P, and organic P in the aggregates. Comparing with rice straw amendment alone, the amendment with rice straw plus fungal inhibitor actidione decreased the amount of microbial biomass C in the aggregates by 10.5%-31.8% in the first 30 days. Such a decrement was significantly larger than that (6.8%-11.6%) in the treatment amended with rice straw plus bacterial inhibitors tetracycline and streptomycin sulphate (P<0.01). After the first 30 days, the microbial biomass C remained constant. In the first 20 days, the amount of microbial biomass P in the aggregates was 10.0%-28.8% highe