A study of the effects of soil bulk density on root and shoot growth of different ryegrass lines
| Autor: | D. J. Houlbrooke, C. D. A. McLay, R. Chapman, E. R. Thom |
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| Rok vydání: | 1997 |
| Předmět: | |
| Zdroj: | New Zealand Journal of Agricultural Research. 40:429-435 |
| ISSN: | 1175-8775 0028-8233 |
| Popis: | A glasshouse pot trial was designed to investigate the effects of bulk density on the root and shoot growth of two pipeline perennial ryegrass (Lolium perenne) lines, NZA1 and NZA3, and a commercial cultivar Yatsyn 1, in a soil derived from volcanic tephra in New Zealand. Bulk densities of 0.9, 1.0, 1.1, and 1.2 Mg/m3 were achieved in the subsoil growing medium as a subsurface layer in pots that were arranged in a complete factorial design, and caused penetration resistances of 2.2, 2.9, 3.6, and 4.4 MPa, respectively. Five harvests of herbage were made over 24 weeks from planting. At the final harvest, roots in the surface, subsurface, and lower pot strata were separated from the soil. Estimates of root length and dry weight were made. Increasing subsurface soil bulk density reduced root length from 20.4 to 8.4 m per pot stratum (P < 0.05). This decrease in root development was associated with decreased (P < 0.05) herbage yield (4.72 to 2.38 g/ pot) and tillering, showing that the increased mech... |
| Databáze: | OpenAIRE |
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