Ervin says that means some farmers have returned to using soil-disturbing tillage or more toxic herbicides to control weeds.

VOA: standard.2010.04.15

so we don't use like pesticides or herbicides or anything.

所以我们不用任何像杀虫剂或除草剂类的东西。

想要个农场 - SpeakingMax英语口语达人

If that price is too low,he says, it will not adequately cover the expense of fuel,fertilizer, herbicides and equipment.

VOA: standard.2010.07.29