Ultra narrow row (UNR) cotton, is cotton with row spacings of 50 cm or less. The rationale for investigating narrow row cotton production was that it had the potential to reduce season length, provide a better spatial arrangement, and produce the same yield by having fewer boils on a greater number of plants. Early Australian trial work in the Murrumbidgee Irrigation Area by Low and McMahon (1973), and by Low, MCMahon and Pistillo(1975) did show yield benefits with narrow rows. However, there were several limitations to the development of the system. These included the development of varieties, cultural practices and harvesting machinery adapted to narrow row production.