Only 6% of the cereal area of U.K., including sprayed and unsprayed fields, contained more than one wild oat seed head/m2 (10000/ha), the majority had less than one/20 m2. Black grass was reported on 50% of farms in England (22% of cereal area) mainly in East and South, and ...
couch) n [U] type of grass with long creeping roots 匍匐冰草; 茅草. couchant / 5kaUtFEnt; `kaJtFEnt/ adj (usu directly after a n 通常直接用於名词之後 ) (heraldry 纹 ) (of an animal on a coat of arms) lying with the body resting on the legs and the head raised (指纹 章上的...