Conical Hat
A bamboo thing you put on your head to stand taller would probably be a hat. A bamboo hat is probably one of those hats you think of when you think of rice farmers, a conical hat.
りゅう
かさ
None
A conical hat is kind of like an umbrella on your head. What's the reading for "umbrella" in Japanese? Why, it's kasa (かさ)!