Currently when you tap on a carrot, you get a sickle that allows you to harvest that crop.
I would like to have a second option, a sickle with the crop symbol that you tapped (in this case a carrot).
Selecting this option will harvest the carrot and plant a carrot at the same time.
And, a triple tap (with optional drag) would allow you to harvest and replant similar to the current double tap that allows you to harvest.