The sprinkler is a block that will water a 4x3 area of crops daily. It must be supplied with a water source such as a bucket every 3 days. It can only water crops on its level.
To most efficiently place the sprinklers, make sure to put one in between two rows of 3x3.
The sprinkler can be bought from Danieru at weekends for 10 000 after year 1. Alternatively, you can buy it from Major Jeimmi during year 1 for 150 000 coin.