Effects of the herbicide Topogard on soil respiration, nitrification, and denitrification in potato-cultivated soils differing in pH |
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Authors: | E E Kara M Arli V Uygur |
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Institution: | (1) Faculty of Engineering, Environmental Engineering Department, Ni de University, Ni de, Turkey;(2) Agricultural Faculty, Soil Science Department, Mustafa Kemal University, 31040 Antakya, Hatay, Turkey |
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Abstract: | We investigated the effects of Topogard 50 WP (3 kg ha–1) on soil respiration, mineral N content, and number of denitrifying and total bacteria in four coarse-textured volcanic soils for 91 days. Topogard application decreased CO2 evolution in acid soils (Tepedibi and Karaçak l) whereas soil respiration was initially increased in neutral and alkaline soils (Ka ba![scedil](/content/dttjaj2hv2ykxmj0/xxlarge351.gif) and Ba lar). The herbicide application significantly stimulated ammonification in Ka ba![scedil](/content/dttjaj2hv2ykxmj0/xxlarge351.gif) and Ba lar soils, while Tepedibi and Karaçak l soils showed significantly lower NH4+-N contents than the control. The treatment inhibited the activity of nitrifying microorganisms and, thus it decreased the NO3–-N content in Tepedibi, Karaçak l, and Ka ba![scedil](/content/dttjaj2hv2ykxmj0/xxlarge351.gif) soils, whereas the NO3–-N content was increased in Ba lar soil. The NO2–-N content of soils was not affected by the treatment. The activity of denitrifying bacteria was stimulated by the addition of herbicide in all soils, whereas the total number of bacteria was not influenced. It may be concluded that the effects of Topogard on the microbiological characteristics of coarse-textured soils are likely to be dependent on soil pH. |
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Keywords: | Topogard 50 WP Carbon dioxide production Mineralization Bacteria number pH |
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