Wheat growers in Australia face several problems in trying to improve wheat yield not the least of which is lack of nutrients. Many of the soils in South Australia, Victoria, and New South Wales are naturally low in phosphorus. This fact coupled with high fertilizer costs and difficulty in finding good sources of phosphorus fertilizer make it difficult for growers to address this problem. A study was conducted at six locations across South Australia, Victoria, and New South Wales to examine wheat response to added phosphorus and to determine whether fertilizer additives would improve phosphorus uptake and fertilizer use efficiiency. Four rates of triple-super phosphate with and without the additive Avail were tested in a randomized complete block design with four replications. Tiller counts from each plot were recorded at flowering and wheat yield was measured. Results indicated that indeed added phosphorus increased the number of tillers produced by the plant and increased wheat yield. The use of the fertilizer additive Avail did increase tiller number compared to the same rate of phosphorus without the additive but did not result in a significant increase in wheat yield. Wheat growers in Australia would benefit from added phosphorus fertilizer through increases in wheat yield.