Anchor: The most extensive field experiments, conducted under the National Crop Loss Assessment Network (NCLAN), examined 15 species and numerous cultivars.
Entailed: There NCLAN conducted some extensive experiments in the field.
Contradiction: The least extensive field experiments were done by the NCLAN and no examinations were undertaken.
Contradiction: the man is raking leaves
Contradiction: I don't think that this young man's problem could've been detected by a drug test. 
Contradiction: Meanwhile, Baltimore.
Contradiction: A man is climbing a ladder, inspecting foliage.