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Starter fertilizer (ammonium poly-phosphate) was evaluated in combinations with Amisorb ® (polyaspartate) Nutrient Absorption Enhancer (1997-1998) and Donlar DXL-500 beta protein biopolymer (1999-2000) for their effects on crop nutrient management and cotton production. In a 2-year study to evaluate Amisorb combinations with starter ammonium poly-phosphate (10-34-0), neither broadcast nor band applications had any significant effect on total lint yields. Total lint yields over the 1997 and 1998 growing seasons averaged 1152, 1165, and 1174 lb/acre for the 0, 1, and 2 qt/acre Amisorb applications, respectively. In a second study (1999-2000), six treatments combinations involving 1 to 3 qt/acre of DXL500 with and without 10 gal/acre of ammonium polyphosphate (10-34-0, 12.4 lb N/acre, 18.4 lb P/acre) starter fertilizer were studied at two locations in the Mississippi Delta. This research was located on the Delta Research and Extension Center (DREC, Irrigated) at Stoneville, MS on a Bosket very fine sandy loam (Mollic Hapludalfs) and on the Tribbett Satellite Farm (TSF, Non-irrigated) at Tribbett, MS on a Forestdale/Dundee silty clay loam (Typic Ochraqualfs/Aeric Ochraqualfs). For each study, nitrogen (N) was applied at a total rate of 120 lb N/acre as urea-ammonium nitrate solution (32% N, 3.54 lb N/gal) with one-half of the total N applied prior to planting and the remainder as a sidedress application at beginning bloom. Cultural practices such as weed and insect control, cultivation, and defoliation were maintained uniformly across all treatments but were specific for each location. At TSF, total lint yields ranged from 1046 to 1070 lb/acre when averaged across years. There was no significant difference between any of the treatments and no response to either starter fertilizer or the DXL500. With respect to the DREC study, total lint yields ranged from 1332 to 1356 lb/acre when averaged across years. The irrigated cotton on the sandy loam at DREC had yields which were about 27 % higher than the non-irrigated yields at TSF on the silty clay loam. There was no significant difference between the DXL500 treatments. Under the conditions evaluated, which were quite diverse, the was no benefit from either starter fertilizer or Donlar DXL500. In summary, neither the applications of starter fertilizer (ammonium poly-phosphate) nor the applications of Amisorb or DXL-500 amendments had any significant effect on cotton production. |
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©National Cotton Council, Memphis TN |
Document last modified XXXXXX, XXX XX 2001
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