Sign up for email alerts of new Fluid Journal issues!
Fluid Journal : Fluid Journal 1999-2001
2 Fluid Journal Fall 1999 1, and Wichita) experienced very dry fall weather. Deep-banded P plots produced significantly greater total forage yield at each of these three sites. An average of 84 percent or 1,137 lbs/A more dry weight forage was harvested from deep-banded P plots than from wheat treated with surface incorporated P, which yielded essentially the same as the no-P check. In the Baylor-Year 2 and Abilene trials, plots had unusually high rainfall during the fall and early winter. Forage response to deep-banded P at the Baylor site, while still significantly higher, was only 14 percent or 538 lbs/ A greater than surface-incorporated P. At Abilene, the surface P treatment yielded significantly more than deep- banded P, but both placement techniques caused very large forage responses when compared to no-P checks. The 5-site year summary indicated that wheat forage production with deep- banded P was 24 percent greater than surface-incorporated P, and 55 percent greater than no-P checks. Irrigated. Wheat forage response to P placement was much the same as dryland wheat. In years 2 and 3 of the studies, forage yield response to deep-banded P was 46 and 20 percent greater, respectively, than surface- incorporated P, while in the high rainfall during Year 1, forage yield on deep-banded P was 17 percent less than surface-incorporated P (Figure 2). Over the three-year study, deep-banded P averaged 15 percent greater forage yield than surface-incorporated P treatments and 99 percent greater yield than no-P check plots. Pre -jointing. The majority of wheat farmers use the crop for overwintering stocker cattle on high quality forage, removing livestock near growing point differentiation, and managing the crop for the remainder of the season for grain. In this scenario, early forage yield of pre-jointing forage production is a more important number. Of five studies, deep-banded P response was significantly better than surface incorporation in four, averaging 37 Figure 2. Response of irrgated wheat forage to P fertilizer application and placement, Miller, et al., Texas A & M University. Year 1 Year 2 Year 3 2,000 2,500 3,000 3,500 4,000 4,500 5,000 5,500 Yield - lbs DM/A Deep Band Surface Incorporate Check Figure 3. Response of dryland wheat grain yield to P fertilizer application and placement, Miller, et al., Texas A & M University. Runnels Baylor Year 1 Baylor Year 2 Wichita Abilene 10 20 30 40 50 60 70 Yield - bu/A Deep Band Surface Incorporate Check
Fluid Journal 1996-1998
Fluid Journal 2002-2004