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  • Küçük Resim
    Öğe
    Effects of the herbicide Topogard on soil respiration, nitrification, and denitrification in potato-cultivated soils differing in pH
    (Springer, 2004) Kara, EE; Arli, M; Uygur, V
    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 Karacakil) whereas soil respiration was initially increased in neutral and alkaline soils (Kasbasi and Baglar). The herbicide application significantly stimulated ammonification in Kasbasi and Baglar soils, while Tepedibi and Karacakil 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, Karacakil, and Kasbasi soils, whereas the NO3--N content was increased in Baglar 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.
  • Küçük Resim
    Öğe
    Evaluation of heavy metals' (Cd, Cu, Ni, Pb, and Zn) distribution in sowing regions of potato fields in the Province of Nigde, Turkey
    (Kluwer Academic Publ, 2004) Kara, EE; Pirlak, U; Özdilek, HG
    The Province of Nigde, located in central Anatolia, supplies approximately 25% of the total potato production in Turkey. In order to investigate selected heavy metals' (cadmium (Cd), copper (Cu), nickel (Ni), lead (Pb), and zinc (Zn)) presence in the region, soil samples from a total of 45 different sampling stations at two different locations (Misli and Altinhisar Plains) were evaluated for their total and extractable heavy metal contents along with their physical and selected chemical properties (pH, salt, CaCO3, phosphorus, soil organic matter, and soil texture) since bioaccumulation of the metals in potatoes might be a problem. Total lead and zinc concentrations were found to be almost at the same order of magnitude in both fields, whereas the total nickel concentration is significantly higher and the total cadmium and copper concentrations are lower in the Altinhisar Plain than the concentrations in the Misli Plain. The average total cadmium and copper concentrations in the Misli Plain, which are higher than the mean total cadmium and copper concentrations in the Altinhisar Plain, indicate that most probably heavy metal containing fertilizer and pesticide use over a long period of time in the Misli Plain has caused an increase in cadmium and copper accumulation in the soil.