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Fluid Journal : Fluid Journal 2005-2007
FALL 2006 Fluid Journal 19 Grain yield Cungena. There was no significant increase in grain yield with the base suspension compared with the base granular fertilizer (Figure 3). Adding micronutrients to the granular fertilizer separately or by coating produced no grain yield response. Including micronutrients in the suspension increased grain yield by 11 percent above the base suspension. There was a 17 percent difference in grain yield between the suspension mixed with micronutrients and the coated granular treatments. Port Kenny. The addition of micronutrients had no effect on grain yields in the granular treatments. In the suspension group, the addition of micronutrients as coated granules (converted to suspension) increased grain yield above the basal (non-micronutrient) suspension by 14 percent (Figure 4). The overall grain yield response between the best suspension and granular treatments was 15 percent. Conclusion The results support our conclusion in the 2005 issue of the Fluid Forum Proceedings, which shows that the best practice for cereal production on the highly calcareous soils of South Australia should involve the use of NP fluid fertilizers containing micronutrients- --principally Zn, Mn, and Cu, although Cu was not used in these experiments. In the future, it may be possible to investigate the possibility of combining fluid fertilizers with fluid fungicides to help control the endemic root disease problem on these soils and bring grain yields closer to the water limiting potential. Figure 3. Grain yield response of Yitpi wheat to dry granular and suspension fertilizers with and without micronutrients. Color bars show response to granular and suspensions, with micronutrient response added as clear top portion of bar. Cungena, 2005. 20 15 10 5 0 Micronutrient Applications GRANULAR SUSPENSIONS Grain yield (bu/A) Check No Micros Dry Blend Coated No Micros Sep Gran Coated Sep Fluid Added Figure 4. Grain yield response of Yitpi wheat to dry granular and suspension fertilizers with and without micronutrients. Color bars show response to granular and suspensions, with micronutrient response added as clear top portion of bar. Port Kenny, 2005. 25 20 15 10 5 0 Micronutrient Applications GRANULAR SUSPENSIONS Grain yield (bu/A) Check No Micros Dry Blend Coated No Micros Sep Gran Sep Fluid Added Coated Dr. Holloway is principal research scientist, D. Brace is research assistant, Dr. I. Richter is senior research scientist SARDI, Minnipa, South Australia; Prof. McLaughlin is senior principal scientist, G. Hettiarachci is research scientist, CSIRO Land and Water, Adelaide, South Australia, Dr. Armstrong is senior research scientist, Department of Primary Industries, Horsham,Victoria.
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