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Fluid Journal : Fluid Journal 2005-2007
Early Spring 2005 Fluid Journal 3 application advantage over the conventional 3-way split dry N as calculated above. Total per acre advantage of banded fluid N over 3-way split dry N would be $40/A plus $19/A or $59/A under 4-leaf flood stage. On clay soil. Rice yields averaged 5,600 lbs/A for the 6-leaf flood and 6,500 lbs/A for the 4-leaf flood stage (Figure 1). The 900-lb/A higher yield created by the 4-leaf flood stage would increase income about $72/A based on a $8/cwt of rice. Less herbicide and less flush- irrigation prior to establishing the flood would reduce production cost $15 to $20/A. Therefore, the 4-leaf flood practice could improve net income as much as $90/A. We plan to expand this initial research to include other soils. Methodology Location. Research plots were located at the Texas A&M Research and Extension Center near Beaumont, Texas. Soil was a league clay. Treatments were evaluated using either "early" (flooding at 3- to 4-leaf growth stage) or "standard" (flooding at 6 to 7- leaf growth stage) water management systems. Application. Fluid N was applied in bands just prior to planting approximately 2 to 3 inches below the soil's surface of the prepared seedbed. Applicator knives were spaced 16 inches apart to provide a band of fluid N between every other 8-inch row of the eight-row drillseeded plots. Fertilizers. The form of fluid fertilizer was 15-3-2 urea-based ammonium phosphate. The dry fertilizer was a mixture of urea, 0-46-0, and 0-0-60 broadcast and incorporated at planting. Timing. Plots were flooded on May 8 and May 19 for the early and standard flood water management systems, respectively, and remained flooded until about 10 days prior to harvest. Dr. Turner is professor of soils and plant nutrition and Dr. Jund is research associate at the Texas A&M University Agricultural Research Center, Beaumont, TX.
Fluid Journal 2002-2004
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