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Fluid Journal : Fluid Journal 1993-1995
3 Fluid Journal Winter 1994 placed fertilizer. Seed cotton did not correlate well with early season growth. Yield increas- es varied among soils, treatments, and over years. Fluid starters produced yield increases in two out of the three years on both soils. When comparing across the years, conventional and no-till were the optimum treatment combinations for the silt loam soil, being about equal with 2 x 2 placed NP or NPK+ In-row subsoil-ing produced mixed results. For sandy loam soil, the best treatment combina-tions were conventional or no- till, in-row subsoiling (regardless of tillage), and 2 x 2 or deep-placed NP and occa-sionally NPK. Averaging across tillagc systems for the two years in which yield responses occurred showed that 2 x 2 placement resulted in yields as shown in Figure 2. North Carolina. ln 1991 experiments, Guthrie evaluated the effects of cotton planting date and sidehanded fluid starter fertilizer. Cotton was grown at four sites: two Norfolk loamy sands and two Craven fine sandy loams. Ammonium polyphosphate was applied either broadcast or sidehanded at a nitrogen rate of 17 lbs/A and phosphate rate of 57 lbs/A. Placement had minor effects on plant population. Sidebanding increased lint yield 73 lbs/A versus broadcast (Figure 3). Conclusion was sidebanding can benefit producers irre- spective of environmental conditions or planting date. The yield increase was consistent with that reported by Funderburg in 1988. However, Guthrie's results do not agree with Funderburg's finding that yield responses to fluid starters were greatest where lint yields exceeded 850 lbs/A. In Guthrie's study, starters consistently improved yields, although overall yields declined with later planting dates. So data from this study suggest that response to sidebanded fluid starters does not depend on the presence of early season environmental stress. Dr. Fixen is North Central director for the Potash & Phosphate Institute, Brookings, SD. and Dr. Lohry is agronomist for Nutra-Flo Company in Sioux City, IA. !
Fluid Journal 1996-1998