cutgrass造句

• This paper reportsthe biological habits ， damage and occurrence regularity of common cutgrass . foreffectively controlling weed infestation in fields ， it is necessary to establish somerational farming and rotation systems and ameliorate chemical weed control system day byday
  通过对李氏禾的生物学特性、发生规律及危害的阐述，提出只有通过建立科学合理的耕作和轮作制度及日趋完善的化学除草体系，才能有效地控制李氏禾的危害。