Sign up for email alerts of new Fluid Journal issues!
Fluid Journal : Fluid Journal 2002-2004
3 Fluid Journal Winter 2002 Figure 4. Effect of fertilizer source and application of Zn on grain yield of Frame wheat, Emerald Rise, 2000. Zn - lbs/A Yield - lbs/A 0 1250 1300 1350 1400 1450 1500 1550 1600 2.2 Fluid Granular application, but in the fluid applica- tion, increasing rates of application had significant positive effects on yield. At zero N, grain yields from fluid and granular applications were not different. But when N was applied, grain yields were significantly greater with fluid than with granular. At the 18- lb/A rate of N, fluid-treated plots produced 11 percent more grain than the granular- treated plots. The application of Zn did not affect grain yield with granular treatments, but yields with fluid treat- ments were significantly greater when Zn was added. Methodology Rainfall. Annual rainfall at Miltaburra was 13.6 inches (above aver- age) and 11.8 inches at Emerald Rise. Data from previous seasons and com- parisons between higher and low rain- fall sites indicate that the efficiency of fluid fertilizer (compared to granular) may be relatively greater in drier envi- ronments and at lower rates of applica- tion. Soil at Miltaburra is a grey, highly calcareous sandy loam. At Emerald Rise, it is a red brown calcareous sand loam. Dilution rate. Previous experiments, including these reported, were designed on the assumption that a relatively high dilution rate was required to ensure maximum distribution of the fertilizer, and that this would improve the avail- ability of nutrients, particularly P in calcareous soils. The dilution rate ex- periments at Yandra and Miltaburra (data not shown) were conducted to assess the affect of dilution rate of flu- ids at two rates of P. At Yandra, grain yield was significantly reduced by ap- plying fluid at less than 13 gal/A, the first rate of dilution above the applica- tion of neat fertilizer. At Miltaburra, dilution rate had no effect on grain yield, although more research is needed in dry seasons, given the visible differ- ences early in the season at both sites. Design. At Miltaburra and Emerald Rise, combinations of P, N, and Zn were applied in a factorial design with four replications. Dr. Holloway is principal research scien- tist, SARDI; Dr. Bertrand is post doc- toral research fellow, CSIRO; Mrs. Frischke is research scientist, SARDI; Mrs. Brace is research assistant, SARDI; Dr. McLaughlin is senior princi- pal research scientist, CSIRO, Adelaide, South Australia.
Fluid Journal 1999-2001
Fluid Journal 2005-2007