0 When a chemical substance leaches or is leached from a material, especially soil, it is removed by the action of water passing through the material:
1 (of a substance) to come out of or be removed from another substance, esp. dirt, by passing water through it
The lower unit is characterised by an average porosity of about 13% which is largely derived from vugs produced by leaching of replacement anhydrite.
The data may suggest that growing lowland rice during the wet season could reduce the amount of nitrate leached to the shallow aquifer.
Under such conditions, nitrate can be leached and can contaminate the shallow aquifer which is also a source of drinking water.
In fields with low erosion rates, there is little increase in leaching.
As the topsoil was removed, leaching increased by 40 per cent, on average, over the 30-year time horizon.
The lowest maize yield harvested in 1996/97 under sole maize was attributed to leaching and water logging due to excessive rainfall and lodging.
The leaching fraction of 0.2-0.3 was provided for all treatments during the course of the experiment.
The soil was then leached with 95 % ethanol to remove free salts, air-dried and passed through a 2-mm sieve.
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