Influence of Silica on Chemical Composition and Decomposition of Turfgrass Tissue1
- J. R. Street,
- P. R. Henderlong and
- F. L. Himes
Two turfgrass species, ‘Kentucky-31’ tall fescue (Festuca arundinacea Schreb.) and ‘Pennstar’ Kentucky bluegrass (Poa pratensis L.), were cultured in hydroponics at silica rates of 0 to 100 ppm SiO2. Tissue C and N percent decreased with increasing silica supply, but the C-N ratio remained unchanged. Celiulose and lignin content increased slightly with increased silica supply. Dry matter components (stubble:leaf:root ratio of 2:1:1) of the species with established silica gradients (0.35 to 5.5 %) from hydroponics were soil incorporated (whole or ground) or layered on the soil surface to determine the effects of silica content and method of incorporation on decomposition. Decomposition (CO2 release) of tall fescue was decreased 12.1, 12.6, and 13.8 % at the highest silica level in the mixed, layered, and ground soil-plant systems, respectively. Decomposition of Pennstar Kentucky bluegrass was reduced 9.1 % at the highest silica level in the ground soil-plant system only. Decomposition did not differ between the mixed and layered systems for either species. The silica content of ‘Merion’ Kentucky bluegrass thatch from field plots ranged from 4.9 to 8.7 %.Please view the pdf by using the Full Text (PDF) link under 'View' to the left.
Copyright © 1980. . Copyright © 1980 by the American Society of Agronomy, Crop Science Society of America, Soil Science Society of America, and International Turfgrass Society, 5585 Guilford Rd., Madison, WI 53711 USA