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Fluid Journal : Fluid Journal 2002-2004
1 Fluid Journal Winter 2002 Summary: Summary: Summary: Summary: Summary: Shoot dry weight increased 27 percent by adding 9 lbs/A of fluid N, versus no response to granular appli- cation. Similarly, the application of 9 lbs/A of fluid N increased P uptake in shoots by 29 percent, Mn uptake by 31 percent, and N uptake by 30 percent. No differences were recorded with granular applications. Adding N or Zn had no effect on grain yield with granular fertilizer treatments but with fluids significant positive yield re- sponses occurred with applications of 9 and 18 lbs/A of N. Grain yield at the 18-lb/A rate of N application was 11 percent higher with fluid than with granular. Similarly, additions of 2.2 lbs/A of fluid Zn increased grain yield by 11 percent, versus no response with granular treatments. Operational funds provided by the Fluid Fertilizer Foundation enabled wheat trials to be conducted at Miltauburra, Emerald Rise, and Yandra on the Upper Eyre Peninsula, South Australia, in 2000. Experiments were designed to investigate different as- pects of fluid and granular fertilizers on highly and moderately calcareous soils. Farmers have been enthusiastic about the prospects for using fluid fertilizers on a commercial scale. Miltaburra Zinc uptake in shoots was signifi- cantly affected by form of fertilizer and by the application of Zn. The applica- tion of 2.2 lbs/A of Zn increased zinc uptake by 17 percent. P uptake was increased 37 percent when applied in the fluid versus granu- lar form. Adding 9 lbs/A of N increased P uptake by 12 percent. Adding 2.2 lbs/A of Zn increased P uptake by 8 percent. Manganese uptake in whole shoots increased 17 percent when applications were in the fluid versus granular form. Although a limiting role for Mn has not been clearly determined on these soils, Mn deficiency in cereals tends to in- crease toward the coastal areas on the Eyre Peninsula, where calcium carbon- ate concentrations in the soil increase by Dr. R.E. Holloway, Dr. I. Bertrand, Mrs. A.J. Frischke, Mrs. D.M. Brace, and Dr. M.J. McLaughlin Fluids Outdual Granular In Australian Wheat Trials Fluid sources of P, N, and Zn performed markedly better than granular fertilizers in terms of promoting dry matter, P uptake, and grain yield. to upwards of 90 percent. It is possible that the requirement for Mn is modified by low levels of available P in these soils. Although research is needed to clearly define the issue, the role of Mn may be of considerable importance in these soils where Mn deficiency can occur and root disease is endemic. Tis- sue tests generally indicate "adequate" concentrations of Mn in wheat grown on these soils, although it is possible that if concentrations of P can be in- creased, this may lead to deficiency of some micronutrients, particularly Mn. Total N concentration in whole shoots was a function of a three-way interac- tion between form of fertilizer, N, and Zn application (Figure 1). Note how N Granular Fluid 4000 3900 3800 3700 3600 3500 3400 0 2.2Zn 9N 9N 2.2Zn Applied rate - lbs/A ppm Figure 1. Effect of fertilizer source (fluid or granular) and n/Zn rates on N concentration in Frame wheat whole shoots at Haun 5 growth stage, Miltaburra, 2000.
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