Ultra narrow row (UNR) cotton, is cotton with row spacings of 50 cm or less.

The long term production of cotton it the same field often leads to low yields, even with 1:large amounts of nitrogen (N) and phosphorus (P) fertiliser.

In 1993 a series of experiments were established in the Namoi and Macquarie valleys to study the effects and benefits of rotation crops for subsequent cotton crops.

Growing other crops in rotation with cotton appears to offer the best prospect for long term viability of the cotton industry.