茬口

xuǎn hǎo chá kǒu shí xíng hé lǐ lún zuò

选好茬口，实行合理轮作。

Select the right crops and rotate them rationally.

zhè chá kǒu zhuàng zhòng tǔ dòu zhèng hé shì

这茬口壮，种土豆正合适。

The soil left after the harvest is robust and well-suited to potato growing.