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Soil/Water Adsorption Coefficient (Kd)The Kd value is a measure of how tightly the pesticide binds or sticks to soil particles. The greater the Kd value, the less likely a chemical will leach or contribute to runoff. A very high value means it is strongly adsorbed onto soil and organic matter and does not move throughout the soil. Higher is better. Pesticides are less likely to leach or occur as surface runoff when the Kd is greater than 5.
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