Monday, 7 November 2005
15

Influence of Charcoal and Humic Material Amendments on Growth Characteristics of Bermuda grass Seeded in a Compacted Soil Medium.

P. Seger, J. Windingstad, M. Essington, J. Lee, J. Sorochan, D. Yoder, and N. Eash. University of Tennessee, 278 New Agr. Eng. Building, Knoxville, TN 37996

Minimizing surface erosion from denuded slopes and post-construction land area is an environmental concern addressed by federal and state conservation agencies. Vegetation establishment on these areas helps stabilize slopes and minimize erosion losses. However, vegetation establishment is difficult on these highly-disturbed anthropogenic soils. Suggested management practices are often costly or high maintenance over time. Previous research has shown that charcoal and/or humic material amendments may provide long-term benefits to soil fertility, structure, and productivity with minimal maintenance. This project investigates the use of commercial charcoal and humic materials as amendments for amelioration of highly-disturbed soils. An RBD factorial experiment with four reps was conducted in a greenhouse using common soil fill material amended by six charcoal treatment levels (0, 5, 10, 15, 20, 25 % charcoal by mass) and three surface-applied humic material treatment levels (0, 2.5, 25 gallons humic material acre-1). After treatment application, the 5.0 L garden pots received starter fertilizer at 1 lb. N/(1000 ft2) and were seeded with Riviera Bermuda grass at 2 lb. seed/(1000 ft2). Slow release fertilizer was applied two weeks post-seeding at 3 lb. N/(1000 ft2). Digital surface images were collected progressively throughout setup and germination. Physical germination counts were taken at one and two weeks post-seeding. After germination, grass clippings were removed for oven-dry biomass measurements. Both treatments have apparent effects on the growth and germination characteristics of Bermuda grass. The results indicate promise for use of these materials in constructed soil media and to help establish vegetation on highly-disturbed soils.

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