Breakdown of jīntiān búyòng shīféi.
Questions & Answers about jīntiān búyòng shīféi.
This is because of tone sandhi.
- 不 is normally fourth tone: bù
- But when 不 comes before another fourth-tone syllable, it changes to second tone
Since 用 yòng is fourth tone, 不用 is pronounced:
This is a pronunciation change, not a meaning change.
Here, 不用 + verb means there is no need to ... or you don’t need to ...
So 不用施肥 means:
- no need to fertilize
- don’t need to apply fertilizer
In other contexts, 不用 can also mean do not use, but in this sentence it clearly means no need to, because it is followed by the action 施肥.