To take a turn at doing s.t.; to all work together on one person's job and then transfer to another person's job (thus taking turns).
We should all work together when planting one person's crops and then all work together on another person's crops so that when our rice grows it will not be growing at different stages.
When you plant, it will be my turn to help you.
Since we don't have lots of coconut trees, let's not divide them up, but let's just take turns in harvesting them.