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Fluid Journal : Fluid Journal 1999-2001
2 Fluid Journal Winter 1999 when no starter had been applied and by an additional 13 to 42 lbs/A when 10-34-0 or 12-22-5-2S was applied as starter. There was not a statistically significant interaction between litter rate and fluid fertilizer treatments for lint yield. However, lint yield response to foliar fertilizer clearly decreased as litter rate increased (Figure 3), indicating that some of the response from the fluids was due to their supply of the same nutrients contained in the broiler litter. It is suggested that additional response from fluids was due to timing of application. Yields -- 1997 In the second series of studies, treatments containing N generally produced yield increases at Midville (Figure 4). Yields were significantly greater than untreated when applying 28-0-0-5S and 32-0-0. At Plains, significant yield increases were observed with treatments containing P. Here, lint yields were significantly greater than untreated when applying 10-34-0 and 10-34-0 + 32-0-0. At Midville, 32-0-0 produced the highest yield. All treatments received the same amount of fertilizer N. Therefore, starter treatments received more N at planting and less at sidedress. This method of N distribution may be more efficient for Dothan soils. At Plains, Greenville soils have a high P fixation capacity. Generally speaking, P-containing treatments increased yield relative to untreated areas. P-containing starters applied on cotton may, therefore, have a yield advantage on Greenville soils. The rather large amount of preplant fertilizer used in Tifton may help explain the lack of yield response to starters at this location. In addition, enhanced yield response to starters has been reported when adverse environmental conditions are encountered at planting. Cotton was planted at the Midville and Plains locations in late April. Approximately two weeks of cool, wet conditions were encountered immediately after planting. The Tifton location, however, was not planted until after this period of adverse weather in mid May. Dr. Bednarz is assistant professor and Dr. Gascho is professor in the Department of Crop and Soil Sciences at the University of Georgia. Figure 2. Lint yield response (showing increase only) over all broiler litter rates to inorganic fertilizers, Bednarz and Gascho, University of Georgia, 1996. Figure 3. Lint yield response (showing increase only) to foliar at different broiler litter rates, Bednarz and Gascho, University of Georgia, 1996. Figure 4. Effects of starter fertilizer on lint yield, Bednarz and Gascho, Univer- sity of Georgia, 1997. 120 100 80 60 40 20 Yield increase-lbs/A KNO3 KNO3 KNO3 12-22-5-2S 12-22-5-2S 10-34-0 10-34-0 125 150 175 Yield increase-lbs/A 12-22-5-2S 12-22-5-2S KNO3 KNO3 KNO3 10-34-0 10-34-0 100 75 50 25 No Broiler Litter 2 Tons Broiler Litter Tifton 900 1000 1100 1200 1300 1400 1500 1600 Yield-lbs/A Midville Plains 10-34-0 + 32-0-0 32-0-0 10-34-0 28-0-05S 9-0-0-11 Ca Check
Fluid Journal 1996-1998
Fluid Journal 2002-2004