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Fluid Journal : Fluid Journal 1999-2001
3 Fluid Journal Spring 1999 Total forage yield doesn't disclose the potential impact on farmer/stocker operations. The majority of wheat farmers uses crops for overwintering stocker cattle on high-quality forage, removing livestock near growing point differentiation, and managing the crop for the remainder of the season as a grain crop. In this scenario, early forage yield of pre-jointing forage production is a more important number. In five of seven studies, early forage yields (pre- jointing) were taken. Summarizing across these five studies, deep-banded P response was significantly better in four cases than surface incorporation, averaging 37 percent greater forage yield than surface incorporation, and 128 percent more than the no-P check. Dryland wheat grain Grain yield response to P application method was less consistent than forage yield response. In five dryland site comparisons, deep-banded P yielded significantly more than surface incorporation only one time. Under unusually dry weather at Wichita, grain yield was significantly improved (more than 11 bu/A) by deep placement, while the reverse was true in very favorable rainfall conditions at Abilene where surface-incorporated P yielded more (14.5 bu/A) than deep-banded P (Table 3). Little difference was noted at three other sites. Across five sites, no significant difference in grain yield was noted due to P placement, although either technique resulted in grain yields 10 bu/A higher than no-P check (Figure 3). Irrigated wheat grain In the three-year study at Etter, grain yield with deep-banded P was significantly greater than with surface- incorporated P in 1993. No significant difference was noted in the other two years of the study. Either placement technique resulted in average grain yields more than 13 bu/A greater than the no-P check (Figure 4). Dr. Miller is professor and Dr. Bean is associate professor, Texas A & M University.
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