A field trial was carried out to investigate the effect of applying different masses of phosphate fertiliser on grain yield of a wheat cultivar - Scottish Highers Biology - Question 17 - 2019

To minimize bias in the field trial, the design can be improved by dividing each field into sections and randomly applying different masses of phosphate fertiliser. This method ensures that each treatment is distributed throughout the field, which accounts for any variability in soil conditions, microclimates, or other environmental factors that could affect the yield. Randomization helps to reduce systematic errors and allows for a more accurate comparison of the effects of different fertiliser amounts.