Summary of results: A 30hp Kubota tractor fitted with an air conditioned safety cab was purchased from the government contract supplier in Sydney. The tractor was trucked to Kingaroy Engineering Works for modifications, including: - raising the tractor to have I.Sm ground clearance - conversion to a 2m wheeltrack suitable for row crops - fitting of tanks, pump, boom and plumbing. The sprayer was delivered to Narrabri Agricultural Research Station in November, 1989, and has been extensively used through the last 2 cotton seasons in m.iticide and insecticide trials, chemical labelling of H eliothis spp, investigation of rates and timing of plant growth regulators and foliar fertilizers. An article reporting the development of the sprayer was published in the Australian Cottongrower (August - September, 1990).