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Fluid Journal : Fluid Journal 1999-2001
3 Fluid Journal Fall 1999 percent greater forage yield than surface incorporation, and 128 percent greater than the no-P checks. Grain response Dryland grain yield response to P application method in these studies was less consistent than forage yield response. In five site years, deep- banded P yielded significantly more than surface-incorporated P only one time. Under unusually dry weather at Wichita, deep placement improved yield by more than 11 bu/A (Figure 3). With favorable rainfall the reverse was the case. At Abilene, surface- incorporated P yielded 14.5 bu/A more than deep-banded P. Little difference was observed at the three other sites. Across all five sites, no significant difference in grain yield was observed owing to P placement, although either placement technique produced an average grain yield of about 10 bu/A higher than no-P checks. Irrigated. In the three-year irrigated study, grain yield with deep-banded P was significantly greater than with surface -incorporated P in Year 2, but no significant difference was noted in the other two years of the study. Either placement technique produced average grain yields 13 bu/A greater than no-P check. Methodology Fertilizer. Phosphorus source in each trial, except Abilene, was fluid ammonium polyphosphate (10-34-0). At the Abilene site, 11-52-0 (MAP) was the P source. UAN was the N source in all studies except Abilene, where ammonia was used. Placement. Deep-banded N-P was applied with a chisel applicator. Surface-applied P was incorporated with a disk or field cultivator. In six of the studies, interval between chisels was 10 inches. In two irrigated studies, interval between chisels was 15 inches. Depth of bands was approximately 8 inches. Plot design was a randomized complete block with either 3 or 4 replications. Dr. Miller is professor and extension agronomist, small grains, and Dr. Bean is associate professor and extension agronomist, Texas A & M University.
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