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Fluid Journal : Fluid Journal 2005-2007
3) costs for four 2003 fertilizer treatments were $60.06/A, $65.08/A, $65.71/A, and $73.95/A; in 2004, fertilizer + application cost for 150- 30-20 varied by only $5.90/A for the 4 fertilizer treatments. 2003. All-FF applied at planting and flooded at 4-leaf was on an economic par with dry applied during planting, but had a $57/A advantage over the conventional 3-way split of dry and a $65/A advantage over 2-way split FF plus dry. All-FF showed additional Figure 3. Gross returns/A minus fertilizer and application costs. Numbers in ( ) represent the per acre economic advantage of treatments 2, 3, and 4 relative to treatment 1, 2003. Figure 4. Gross returns/A minus fertilizer and application costs. Numbers in ( ) represent the per acre economic advantage of treatments 2, 3, and 4 relative to treatment 1, 2003. economic benefits when flooded at the 6-leaf stage (Figure 3). These data show all-FF applied during planting had economic advantages of $85, $88, and $48/A over the 1-, 2-, and 3-way split fertilizer treatments. 2004. The 4- and 6-leaf effects on yield were not significantly different, so yields were averaged for each soil type and only one economic benefit is shown (Figure 4). Subsurface banded all-FF was either on a par with or was the most economical fertilizer treatment. On clay soil, the all-FF treatment was on a par economically with the 2-way split and showed a $41/A and $25/A economic advantage over the 1-way and 3-way fertilizer splits, respectively. On the silt loam soil, which had a high N supply, the all- FF treatment and yield exceeded the at-planting dry treatment yield and was on a par with the 2- and 3-way splits. The all-FF economic advantage over the 1-, 2-, and 3-way fertilizer splits calculated at $72, $6, and $30/A, respectively, based on current fertilizer and application costs. Dr. Turner is professor of soils and plant nutrition, Mike Jund is research associate at Texas A&M University Agricultural Research Center, Beaumont, TX, and Mark Hebert is sales agronomist, Texas Liquid Fertilizer Co. , Hempstead, TX.
Fluid Journal 2002-2004
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