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Published online 9 August 2005
Published in J Environ Qual 34:1566-1572 (2005)
DOI: 10.2134/jeq2004.0374
© 2005 American Society of Agronomy, Crop Science Society of America, and Soil Science Society of America
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Degradation of Methyl Isothiocyanate and Chloropicrin in Forest Nursery Soils

Y. Zhanga,*, K. Spokasb and D. Wanga

a Department of Soil, Water, and Climate, University of Minnesota, St. Paul, MN 55108
b USDA-ARS, North Central Soil Conservation Research Lab, Morris, MN 56267



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  		Fig. 1. Comparison of degradation of methyl isothiocyanate (MITC) and chloropicrin (CP) in two fumigated nursery soils and two nonfumigated forest soils at application rates of 195 kg ha–1 for MITC and 140 kg ha–1 for CP in incubation at 22°C. The points are means of triplicate samples (±standard errors).

 


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  		Fig. 2. Comparison of half-life (t1/2) of (a) methyl isothiocyanate (MITC) and (b) chloropicrin (CP) at three application rates of 195, 390, and 785 kg ha–1 for MITC and 140, 280, and 560 kg ha–1 for CP in fresh soils and sterilized soils of two fumigated nursery soils in incubation at 22°C. Vertical bars are standard errors.

 


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  		Fig. 3. Relative contribution of microbial degradation to total degradation of methyl isothiocyanate (MITC) and chloropicrin (CP) in two nursery soils at three application rates of 195, 390, and 785 kg ha–1 for MITC and 140, 280, and 560 kg ha–1 for CP.

 


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  		Fig. 4. Comparison of half-life (t1/2) of methyl isothiocyanate (MITC) and chloropicrin (CP) at four moisture levels at 390 kg ha–1 for MITC and 280 kg ha–1 for CP in a nursery soil. The points are the means of triplicate samples (±standard errors).

 




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