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Fluid Journal : Fluid Journal 2002-2004
2 Fluid Journal Winter 2002 granular applications of N had no effect on N concentration in shoots. However, when no N was applied in fluid fertil- izer, N concentrations in the wheat plants were significantly increased with the addition of Zn. The addition of N did not change N concentrations sig- nificantly above this level. Uptake of N in shoots was significantly affected by form of fertilizer only. Fluid applica- tions increased mean N shoot content by 35 percent, versus granular applica- tions (content = shoot dry weight multi- plied by N concentration). Grain yield was influenced by fertil- izer form, N rate, and Zn rate, with no interactions. Application of fluid fer- tilizer increased grain yield 14 percent, versus granular. In terms of N applica- tion, wheat grain yield was depressed 5 percent when application was increased from 9 to 18 lbs/A, but there were no yield benefits from applying 9 lbs/A (data not shown). Grain yield increased 3 percent with the addition of 2.2 lbs/A of Zn. Other yield parameters are shown in Figure 2. Total dry matter at harvest, density of heads, and harvest index were influenced only by the form of fertilizer applied. Emerald Rise Shoot dry weight was not affected by the form of fertilizer applied when N was absent. Even when N was applied, granular showed no significant increase in shoot dry weight. However, the addi- tion of 9 lbs/A of fluid N showed a 27 percent increase in shoot dry weight over a zero N application. P uptake was significantly increased above all other treatments by the addi- tion of 9 lbs/A of N to the fluid fertil- izer. The increase in P uptake above the zero N fluid treatment was 29 per- cent. It was 35 percent above the 9 lbs/ A of N granular treatment. Mn uptake in whole shoots was sig- nificantly higher in fluid applications at both rates of N. However, while the addition of 9 lbs/A of N increased Mn uptake by 31 percent in fluid treated wheat plants, the addition of N had no effect on Mn uptake in granular-treated plants. Zinc uptake was not affected by treat- ments. Grain yield was a function of interac- tions between form of fertilizer and N application, and form of fertilizer and Zn application. Grain yield was not affected by application of N (Figure 3) or Zn (Figure 4) fertilizer in the granular Yield - lbs/A 4200 4000 4100 3900 3800 3700 3600 Granular Fluid Figure 2. Effects of fertilizer source applied on total dry matter harvest of Frame wheat, Miltaburra, 2000. 1300 1350 1400 1450 1500 1550 1600 1650 0 9 18 N - lbs/A Figure 3. Effect of fertilizer source and application of N on grain yield of Frame wheat, Emerald Rise, 2000. Yield - lbs/A Granular Fluid
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