Microbial activity in different soils in response to metribuzin treatment

L. Santric, L. Radivojević, M. Sarić-Krsmanović, J. Gajić-Umiljendić, Rada Djurovic-Pejcev
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引用次数: 1

Abstract

The effect of metribuzin on soil microorganisms and their enzymatic activity, as well as the amount of metribuzin residues, greatly depend on the type of soil and its physico-chemical properties. A laboratory experiment was set up to determine the effects of metribuzin on different groups of microorganisms and dehydrogenase activity in loamy and sandy soils. The amounts of metribuzin residues in those soils were also determined. The following concentrations were tested: 12.0, 24.0, 120.0 and 1200.0 mg a.i. kg-1soil. Samples were collected 3, 7, 14, 30 and 45 days after metribuzin application. Metribuzin acted inhibitively on total bacteria counts in both types of soil: 6.9% in loamy and 7.9% in sandy soils. Actinomycetes counts decreased over the first 14 days after metribuzin treatment by 15.6% in loamy and 8.1% in sandy soil. However, starting with the 30th post-treatment day, their number either increased or remained at the control level. Fungi counts increased by 6.0% seven days after the application of the two highest concentrations. In sandy soil, fungi counts were significantly reduced by 29%. Metribuzin treatment significantly reduced the activity of dehydrogenase enzyme in both types of soil. Only the highest test concentration applied to the sandy soil showed a stimulating effect (33.2 %). Degradation data showed that the measured amounts of metribuzin decreased over time in both types of soil at all four test concentrations. The results showed that the extracted amounts of metribuzin active ingredient at all its test concentrations were greater in the sandy type of soil. Loamy soil was shown to have a better sorption capacity due to its higher contents of organic matter and clay.
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不同土壤微生物活性对嘧霉嗪处理的响应
美曲津对土壤微生物及其酶活性的影响,以及美曲津残留量在很大程度上取决于土壤类型及其理化性质。通过室内试验研究了美曲霉嗪对壤土和沙土中不同微生物群及脱氢酶活性的影响。还测定了这些土壤中嘧霉嗪的残留量。试验浓度分别为12.0、24.0、120.0和1200.0 mg a.i. kg-1土壤。分别于施药后3、7、14、30、45 d采集样品。甲曲霉嗪对两种土壤细菌总数均有抑制作用:壤土细菌总数为6.9%,沙土细菌总数为7.9%。施药后14 d,放线菌数量在壤土和沙土中分别下降了15.6%和8.1%。但从处理后第30天开始,其数量或增加或保持在对照水平。施用两种最高浓度后7天,真菌数量增加了6.0%。在沙质土壤中,真菌数量显著减少29%。甲曲霉嗪处理显著降低了两种土壤的脱氢酶活性。只有最高试验浓度对沙质土有刺激作用(33.2%)。降解数据表明,在所有四种测试浓度下,两种土壤中测量到的甲霉嗪量随着时间的推移而减少。结果表明,在各试验浓度下,甲曲霉嗪有效成分的提取量在沙质土壤中均较大。壤土有机质和粘粒含量较高,具有较好的吸附能力。
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