Effects of the herbicide Topogard on soil respiration, nitrification, and denitrification in potato-cultivated soils differing in pH

摘要: We investigated the effects of Topogard 50 WP (3 kg ha−1) on soil respiration, mineral N content, and number denitrifying total bacteria in four coarse-textured volcanic soils for 91 days. application decreased CO2 evolution acid (Tepedibi Karacakil) whereas respiration was initially increased neutral alkaline (Kasbasi Baglar). The herbicide significantly stimulated ammonification Kasbasi Baglar soils, while Tepedibi Karacakil showed lower NH4 +-N contents than control. treatment inhibited activity nitrifying microorganisms and, thus it NO3 −-N content Tepedibi, Karacakil, soil. NO2 not affected by treatment. addition all influenced. It may be concluded that microbiological characteristics are likely to dependent pH.