Tuesday, September 24, 2019

Effects of six selected antibiotics on plant growth and soil microbial Research Paper

Effects of six selected antibiotics on plant growth and soil microbial and enzymatic activities - Research Paper Example However, different antibiotics have different effects on a plant, while different plants react differently to a certain antibiotic. What this study was trying to find out are the specific effects of sulfonamides, tetracyclines, tylosin, and trimthoprim on the soil and the plants that depend on it, especially when available data regarding it are scarce and inconsistent. This is important for farmers of agricultural crops such as rice who are using or considering the use of animal manure or treated urine for fertilizer and hydration, respectively. Briefly, different concentrations of analytical grade tetracyclines (chlortetracycline and tetracycline), tylosin, sulfonamides (sulfamethazole and sulfamethazine), and trimethoprim were tested for their phytotoxicity of sweet oat, rice and cucumber through observing their seed germination and plant growth. Tylosin and trimethoprim were included because they are used together with tetracyclines and sulfonamides, respectively. The seeds of sweet oat were the most susceptible to antibiotics, and sulfonamides and tetracyclines had greater effects on seed germination, as compared to tylosin and trimethoprim. In contrast, growth inhibition, especially of rice, was achieved only with sulfonamides. This is because sorption coefficients of sulfonamides are very low in soil as compared to that of tetracyclines, making the former more bioavailable and the latter less likely to be absorbed by the plant. As well, their impact on soil microbial activity was assessed through the observation of their effects on soil respiration and soil phosphatase activity. Soil respiration was greatly affected upon exposure to sulfamethazole, sulfamethazine and trimethoprim, with the first being the most potent and the last being the least, although the recovery of respiration 4 days after application was observed. This is because the dissipation half-life of sulfonamides is 2 to 5, making the antibiotic concentration

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