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char = t;code = 116
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char = d;code = 100
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char = r;code = 114
char = p;code = 112
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char = o;code = 111
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char = i;code = 105
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char = i;code = 105
char = l;code = 108
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char = ;code = 32
char = t;code = 116
char = h;code = 104
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char = c;code = 99
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char = s;code = 115
char = c;code = 99
char = a;code = 97
char = l;code = 108
char = e;code = 101
char = .;code = 46
result sql = Variation of pesticide sorption isotherm in soil at the catchment scale.
Variation of pesticide sorption isotherm in soil at the catchment scale.
char = T;code = 84
char = h;code = 104
char = e;code = 101
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char = a;code = 97
char = t;code = 116
char = i;code = 105
char = o;code = 111
char = n;code = 110
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char = o;code = 111
char = f;code = 102
char = ;code = 32
char = t;code = 116
char = h;code = 104
char = e;code = 101
char = ;code = 32
char = s;code = 115
char = o;code = 111
char = r;code = 114
char = p;code = 112
char = t;code = 116
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char = o;code = 111
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char = i;code = 105
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char = o;code = 111
char = t;code = 116
char = h;code = 104
char = e;code = 101
char = r;code = 114
char = m;code = 109
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char = ;code = 32
char = p;code = 112
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char = s;code = 115
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char = c;code = 99
char = i;code = 105
char = d;code = 100
char = e;code = 101
char = s;code = 115
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char = ;code = 32
char = s;code = 115
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char = m;code = 109
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char = e;code = 101
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char = e;code = 101
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char = ;code = 32
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char = c;code = 99
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char = .;code = 46
char = ;code = 32
char = S;code = 83
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char = c;code = 99
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char = a;code = 97
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char = s;code = 115
char = t;code = 116
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char = y;code = 121
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char = w;code = 119
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char = ;code = 32
char = t;code = 116
char = h;code = 104
char = e;code = 101
char = ;code = 32
char = s;code = 115
char = c;code = 99
char = a;code = 97
char = l;code = 108
char = e;code = 101
char = ;code = 32
char = o;code = 111
char = f;code = 102
char = ;code = 32
char = a;code = 97
char = ;code = 32
char = 1;code = 49
char = 8;code = 56
char = 7;code = 55
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char = h;code = 104
char = a;code = 97
char = ;code = 32
char = a;code = 97
char = g;code = 103
char = r;code = 114
char = i;code = 105
char = c;code = 99
char = u;code = 117
char = l;code = 108
char = t;code = 116
char = u;code = 117
char = r;code = 114
char = a;code = 97
char = l;code = 108
char = ;code = 32
char = c;code = 99
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char = t;code = 116
char = c;code = 99
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char = t;code = 116
char = ;code = 32
char = f;code = 102
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char = e;code = 101
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char = h;code = 104
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char = c;code = 99
char = i;code = 105
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char = e;code = 101
char = s;code = 115
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char = a;code = 97
char = z;code = 122
char = i;code = 105
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char = ,;code = 44
char = ;code = 32
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char = t;code = 116
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char = P;code = 80
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char = e;code = 101
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char = e;code = 101
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char = i;code = 105
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char = b;code = 98
char = a;code = 97
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char = c;code = 99
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char = e;code = 101
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char = e;code = 101
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char = s;code = 115
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char = n;code = 110
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char = 5;code = 53
char = 1;code = 49
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char = p;code = 112
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char = o;code = 111
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char = l;code = 108
char = ;code = 32
char = s;code = 115
char = a;code = 97
char = m;code = 109
char = p;code = 112
char = l;code = 108
char = e;code = 101
char = s;code = 115
char = ,;code = 44
char = ;code = 32
char = a;code = 97
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char = ;code = 32
char = s;code = 115
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char = d;code = 100
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char = m;code = 109
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char = d;code = 100
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char = a;code = 97
char = t;code = 116
char = e;code = 101
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char = r;code = 114
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char = a;code = 97
char = b;code = 98
char = i;code = 105
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char = i;code = 105
char = t;code = 116
char = y;code = 121
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char = t;code = 116
char = ;code = 32
char = t;code = 116
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char = c;code = 99
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char = m;code = 109
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char = ;code = 32
char = s;code = 115
char = c;code = 99
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char = (;code = 40
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char = f;code = 102
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char = e;code = 101
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char = ;code = 32
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char = r;code = 114
char = i;code = 105
char = a;code = 97
char = t;code = 116
char = i;code = 105
char = o;code = 111
char = n;code = 110
char = ;code = 32
char = C;code = 67
char = V;code = 86
char = ;code = 32
char = a;code = 97
char = p;code = 112
char = p;code = 112
char = r;code = 114
char = o;code = 111
char = x;code = 120
char = i;code = 105
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char = a;code = 97
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char = e;code = 101
char = l;code = 108
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char = 3;code = 51
char = 0;code = 48
char = %;code = 37
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char = u;code = 117
char = e;code = 101
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char = o;code = 111
char = f;code = 102
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char = K;code = 75
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char = ;code = 32
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char = e;code = 101
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char = m;code = 109
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char = c;code = 99
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char = h;code = 104
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char = n;code = 110
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char = o;code = 111
char = f;code = 102
char = ;code = 32
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char = o;code = 111
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result sql = The variation of the sorption isotherm of pesticides has seldom been explored at the catchment scale. Such a study was conducted at the scale of a 187-ha agricultural catchment for three herbicides: atrazine, isoproturon and metamitron. Partition coefficient (Kd) values were measured in batch experiments on 51 topsoil samples, and showed moderate variability at the catchment scale (coefficient of variation CV approximately 30%). Values of Kd ranged from 0.47 to 1.70 litre kg(-1) for atrazine, 0.47 to 1.81 for isoproturon, and 0.55 to 2.21 for metamitron. A clustering method was used to reduce the number of samples on which to measure sorption isotherms to 14. Sorption isotherms agreed with the Freundlich rather than the linear model. Kf parameters had CV values similar to those for Kd, with values ranging from 0.78 to 2.13 mg(1 - Nf) litre(Nf) kg(-1) for atrazine, 0.61 to 1.82 for isoproturon, and 0.69 and 2.58 for metamitron. Nf exponents showed little variation (CV < 5%). Nf values were between 0.86 and 0.98 for atrazine, 0.85 and 0.90 for isoproturon, and 0.82 and 0.87 for metamitron. More than 97% of the Kf catchment-scale variations could be explained by the variations of the soil organic carbon content.

Publication: Pest Manag. Sci. 2003 Jan ;59(1)::69-78.
Publication Date: 2003 Jan
Study Author(s): Coquet, Yves;
Institution: UMR INAPG/INRA Environnement et Grandes Cultures, BP 01, 78850 Thiverval-Grignon, France.
Shortcut link to this study:
The variation of the sorption isotherm of pesticides has seldom been explored at the catchment scale. Such a study was conducted at the scale of a 187-ha agricultural catchment for three herbicides: atrazine, isoproturon and metamitron. Partition coefficient (Kd) values were measured in batch experiments on 51 topsoil samples, and showed moderate variability at the catchment scale (coefficient of variation CV approximately 30%). Values of Kd ranged from 0.47 to 1.70 litre kg(-1) for atrazine, 0.47 to 1.81 for isoproturon, and 0.55 to 2.21 for metamitron. A clustering method was used to reduce the number of samples on which to measure sorption isotherms to 14. Sorption isotherms agreed with the Freundlich rather than the linear model. Kf parameters had CV values similar to those for Kd, with values ranging from 0.78 to 2.13 mg(1 - Nf) litre(Nf) kg(-1) for atrazine, 0.61 to 1.82 for isoproturon, and 0.69 and 2.58 for metamitron. Nf exponents showed little variation (CV < 5%). Nf values were between 0.86 and 0.98 for atrazine, 0.85 and 0.90 for isoproturon, and 0.82 and 0.87 for metamitron. More than 97% of the Kf catchment-scale variations could be explained by the variations of the soil organic carbon content.
PMID: 12558101

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