Where did all the tulips go?

Got back to the Bollenvelden (bulb fields) 'cause I'd expected to find the fields loaded with flowering tulips in all kinds of colors like it used to be........ but not this year! Daffodils and hyacints galore but hardly a field of tulips to be found ~ I wonder if tulips must grow on other soil like patatoes must be changed fields annually, but then the lack of tulip fields this year is overwhelming!
These students from China did what a visitor to the bulbfields must do = rent a bike and enjoy the scents and colors from the fields ~ they'd missed the abundance of tulipfields what they'd learned from Holland tourist pictures