Grains and field crops
COMMENTS 1. No insect problems experienced and broadleaf weeds effectively controlled by spraying. Septoria· leaf spot incidence insufficient to affect yields. 2. Little effect of time of planting on either total dry matter or grain yield. Crop received about 70% of the average May-October rainfall with a very dry September-October. Perhaps the distribution of rainfall allowed a similar pattern of water use, and total water use by each planting time. 3. There is probably a significant effect of Nitrogen regime on grain yield. Osmocote (N3) consistently yielded more than either single (N1) or repeated (N2) dressings of Agran 34:0. The continuous source was most effective in increasing grain numbers/m2 but only reduced grain weights slightly ~ compared to N1. Repeated (N2) applications although increasing grain numbers above N1, led to much reduced grain weights. The single application (N1) although producing the lowest grain numbers had the highest grain weights. 4. Soil moisture levels were recorded throughout the trial and will be used with a water balance to attempt to explain the results.
Number of Pages
Weir, R N, Tennant, D, Brown, A G, and Perry, M W. (1979), Wheat potential yield trials - 79KA17 D. Hall, Beaufort River - 79WH32 Wongan Hills Research Station. Department of Agriculture and Food, Western Australia, Perth. Report.