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| Effect of combined application of urea and paclobutrazol on soil enzyme activity under tribenuron-methyl stress |
| Wu Jinan，Wang Liling，Wang Weishuai，Du Huiling |
| College of Arts ＆ Sciences，Shanxi Agricultural University，030801，Taigu，Shanxi，China |
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Abstract A pot experiment was conducted with three-factor completely randomized design to evaluate the dynamic effects of combined application of urea and paclobutrazol on the activity of soil urease, alkaline phosphatase and protease under tribenuron-memthyl stress. The results indicated that: different concentrations of tribenuron-methyl had inhibition-activation effects on soil urease activity, and the effects would be strengthened with increase of concentration. The activation rate on the 60th day was 2.83 times of the control. Alkaline phosphatase activity took on activation-inhibition-activation trend in low concentration of tribenuron-methyl treatment, and inhibition-activation in high concentration treatment. The activation rate on the 60th day was 2.49 times of the control. Protease activity showed activation- inhibition trend in low concentrations of tribenuron-methyl treatment, vice verse, inhibition-activation trend in high concentration treatment. Combined application of paclobutrazol and urea (except B1N1 treatment on protease activity) weakened the inhibition effects on soil urease, alkaline phosphatase and protease activity under tribenuron-methyl stress, and most treatments led to inhibition-activation trend. Urease and alkaline phosphatase activities were significantly higher than the control on the 60th day.
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Received: 02 April 2011
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