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Published online 9 January 2007
Published in J Environ Qual 36:31-43 (2007)
DOI: 10.2134/jeq2005.0430
© 2007 American Society of Agronomy, Crop Science Society of America, and Soil Science Society of America
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Risk Assessment of Unsuitable Winter Conditions for Manure and Nutrient Application across Ontario

D. J. Fallow, D. M. Brown, J. D. Lauzon and G. W. Parkin*

Dep. of Land Resource Science, Univ. of Guelph, Guelph, ON, Canada, N1G 2W1


Figure 1
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Fig. 1. Location of the seven Ontario study sites.

 

Figure 2
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Fig. 2. Probability of exceeding the three criteria [(i) a frost depth greater than 0.05 m; (ii) a snow accumulation of greater than 0.05 m; and (iii) a soil volumetric water content greater or equal to that of the plastic limit for the soil] in Emo. One in 500 yr (0.002) probability spring start and fall end dates are indicated.

 

Figure 3
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Fig. 3. Probability of exceeding the three criteria [(i) a frost depth greater than 0.05 m; (ii) a snow accumulation of greater than 0.05 m; and (iii) a soil volumetric water content greater or equal to that of the plastic limit for the soil] in Guelph. One in 500 yr (0.002) probability spring start and fall end dates are indicated.

 

Figure 4
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Fig. 4. Probability of exceeding the three criteria [(i) a frost depth greater than 0.05 m; (ii) a snow accumulation of greater than 0.05 m; and (iii) a soil volumetric water content greater or equal to that of the plastic limit for the soil] in Harrow. One in 500 yr (0.002) probability spring start and fall end dates are indicated.

 

Figure 5
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Fig. 5. Probability of exceeding the three criteria [(i) a frost depth greater than 0.05 m; (ii) a snow accumulation of greater than 0.05 m; and (iii) a soil volumetric water content greater or equal to that of the plastic limit for the soil] in Kapuskasing. One in 500 yr (0.002) probability spring start and fall end dates are indicated.

 

Figure 6
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Fig. 6. Probability of exceeding the three criteria [(i) a frost depth greater than 0.05 m; (ii) a snow accumulation of greater than 0.05 m; and (iii) a soil volumetric water content greater or equal to that of the plastic limit for the soil] in Mount Forest. One in 500 yr (0.002) probability spring start and fall end dates are indicated.

 

Figure 7
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Fig. 7. Probability of exceeding the three criteria [(i) a frost depth greater than 0.05 m; (ii) a snow accumulation of greater than 0.05 m; and (iii) a soil volumetric water content greater or equal to that of the plastic limit for the soil] in Ottawa. One in 500 yr (0.002) probability spring start and fall end dates are indicated.

 

Figure 8
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Fig. 8. Probability of exceeding the three criteria [(i) a frost depth greater than 0.05 m; (ii) a snow accumulation of greater than 0.05 m; and (iii) a soil volumetric water content greater or equal to that of the plastic limit for the soil] in Smithfield. One in 500 yr (0.002) probability spring start and fall end dates are indicated.

 





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