Inhibition of nitrification in soil by metal diethyldithiocarbamates

Nitrification acts as a key process in determining fertilizer use efficiency by crops as well as nitrogen losses from soils. Metal dithiocarbamates in addition to their pesticidal properties can also inhibit biological oxidation of ammonium(nitrification) in soil. Metal [M=V(III), Cr(III), Mn(II), Fe(III), Ni(II), Cu(II), Zn(II) and Pt(IV)] diethyldithiocarbamates (DEDTC) were synthesized by the reaction of sodium diethyldithiocarbamate with metal chloride in dichloromethane/water mixture. These metal diethyldithiocarbamates were screened for their ability to inhibit nitrification at different concentrations(10 μg/g soil, 50 μg/g soil and 100 μg/g soil). With increasing concentration of the complex, capacity to retard nitrification increased but the extent of increase varied for different metals. At 100 μg/g soil, different complexes showed nitrification inhibition from 22.36% to 46.45%. Among the diethyldithiocarbamates tested, Zn(DEDTC)2 proved to be the most effective nitrification inhibitor at 100 μg/g soil. Manganese, iron and chromium diethyldithiocarbamates also proved to be effective nitrification inhibitors than the others at 100 μg/g soil. The order of percent nitrification inhibition in soil by metal diethyldithiocarbamates was: Zn(II) > Mn(II) > Fe(III) > Cr(III) >V(III) > Co(II) > Ni(II) > Cu(II).

作 者： A.Arora Bijay Singh Dhiraj Sud T.Srivastava C.L.Arora   作者單位： A.Arora,Bijay Singh,C.L.Arora(Punjab Agricultural University, Ludhiana 141 004, Punjab, India)

Dhiraj Sud,T.Srivastava(Sant Longowal Institute of Engineering & Technology, Longowal, Punjab, India) 

刊 名： 環(huán)境科學(xué)學(xué)報(bào)(英文版)  ISTIC SCI 英文刊名： JOURNAL OF ENVIRONMENTAL SCIENCES  年，卷(期)： 2003 15(5)  分類號： X131.3  關(guān)鍵詞： nitrification inhibitor   diethyldithiocarbamate   metal complexes   nitrogenous fertilizers   pesticides  

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