The Canola industry has rapidly grown with a 10 fold increase in area sown in Western Australia over the four years from 1996-99. The driving force behind this increase in area can be attributed to the successful adoption of weed control technology in Triazine Tolerant Canola. By knowing the model of the limiting factors, which are usually; weed control, fertiliser practices, blackleg management, variety selection, seeding dates, seeding depths, insect control and swathing, we can make the right decisions and achieve the targeted profit. To produce yield to potential, all factors need to be optimised, otherwise yields will be decreased by the lowest factor. These production factors are interdependent. If one factor is changed, the other fac...