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shutter
shutter
Ultimo aggiornamento 2018-02-13
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1991; robertson et cherry 1992; cherry et rapaport 1994; shutter et al.
a study of feedlots in alberta found that although levels of n and p were increased in the soil, there was little evidence of extensive downward movement of the nutrients except under one feedlot in a slight depression (sommerfeldt et al.