while true do
    turtle.select(1)
    turtle.place()
    turtle.select(2)
    turtle.place()
    if turtle.getItemCount(2) == 0 then
        turtle.turnLeft()
        if turtle.suck() == false then
            print("pas de bonemeal de dispo")
            turtle.turnRight()
            return
        end
        turtle.turnRight()
    end
    turtle.select(1)
    turtle.dig()
    turtle.select(3)
    turtle.dropDown()
    turtle.select(4)
    turtle.dropDown()
end