TECHNICAL ARTICLESBARLEY SEEDLING GROWTH IN SOILS AMENDED WITH FLY ASH OR AGRICULTURAL LIME FOLLOWED BY ACIDIFICATIONRenken, Roger R.1; McCallister, Dennis L.1; Tarkalson, David D.2; Hergert, Gary W.3; Marx, David B.4Author Information 1Department of Agronomy and Horticulture, University of Nebraska-Lincoln, Lincoln, NE. Dennis L. McCallister, is corresponding author. E-mail: firstname.lastname@example.org 2West Central Research and Extension Center, University of Nebraska-Lincoln, North Platte, NE. 3Panhandle Research and Extension Center, University of Nebraska-Lincoln, Scottsbluff, NE. 4Department of Statistics, University of Nebraska-Lincoln, Lincoln, NE. Contribution of the University of Nebraska Agricultural Research Division, Lincoln, NE 68583, Journal Series No. 14625. Received Aug. 1, 2005; accepted Dec. 22, 2005. Soil Science: May 2006 - Volume 171 - Issue 5 - p 414-422 doi: 10.1097.01.ss0000222888.51501.94 Buy Metrics Abstract Calcium-rich coal combustion fly ash can be used as an amendment to neutralize soil acidity because of its oxides and carbonate content, but its aluminum content could inhibit plant growth if soil pH values fall below optimal agronomic levels. This study measured root and shoot growth of an acid-sensitive barley (Hordeum vulgare L. 'Kearney') grown in the greenhouse on three naturally acid soils. The soils were either untreated or amended with various liming materials (dry fly ash, wet fly ash, and agricultural lime) at application rates of 0,.5, 1, and 1.5 times the recommended lime requirement, then treated with dilute acid solutions to simulate management-induced acidification. Plant growth indexes were measured at 30 days after planting. Root mass per plant and root length per plant were greater for the limed treatments than in the acidified check (0.0 × rate). Root growth in the limed treatments did not differ from root growth in the original nonacidified soils. Top mass per plant in all limed soils was either larger than or not different from that in the original nonacidified soils. Based on top mass per plant, no liming material or application rate was clearly superior. Both fly ash and agricultural lime reduced the impact of subsequent acidification on young barley plants. Detrimental effects of aluminum release on plant growth were not observed. Calcium-rich fly ash at agronomic rates is an acceptable acid-neutralizing material with no apparent negative effects. © 2006 Lippincott Williams & Wilkins, Inc.