harvest

local width = 9
local height = 9

function Left()
  turtle.turnLeft()
  turtle.forward()
  turtle.turnLeft()
end

function Right()
  turtle.turnRight()
  turtle.forward()
  turtle.turnRight()
end

function GoHome()
  local result = height % 2

  if result == 1 then
    for y = 1, height do
      turtle.forward()
    end

    turtle.turnRight()

    for x = 1, width do
      turtle.forward()
    end

    turtle.turnRight()
  else
    turtle.back()
    turtle.turnLeft()

    for x = 1, width do
      turtle.forward()
    end

    turtle.turnRight()
  end
end

function Harvest()

  turtle.forward()

  for y = 1, height do
    for x = 1, width do
      turtle.digDown()
      turtle.suckDown()

      if x < width then
        turtle.forward()
      end
    end

    local result = y % 2

    if result == 0 then
      Left()
    else
      Right()
    end
  end
end

function Dump()
  for z = 1, 16 do
    turtle.select(z)
    turtle.dropDown()
  end
end

function Replant()
  for i = 1, 16 do
    turtle.suckUp(i)
  end

  turtle.forward()

  for y = 1, height do
    for x = 1, width do

      turtle.placeDown(1)

      if x < width then
        turtle.forward()
      end
    end

    local result = y % 2

    if result == 0 then
      Left()
    else
      Right()
    end

  end
end

Harvest()
GoHome()
Dump()
sleep(15)
Replant()
GoHome()
Dump()