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| Titel: |
The effect of surface applied soil amendments on barley root growth in an acid subsoil |
| Auteur: |
Wright, R. J. Hern, J. L. Baligar, V. C. Bennett, O. L. |
| Verschenen in: |
Communications in soil science and plant analysis |
| Paginering: | Jaargang 16 (1985) nr. 2 pagina's 179-192 |
| Jaar: |
1985-02 |
| Inhoud: |
The root growth of an Al sensitive barley (Hordeum vulgare L.) was used to evaluate the influence of surface applied amendments on the properties of an acid subsoil. Soil columns were packed with 10 cm of A horizon over 45 cm of an acidic Bt horizon from a Gilpin silt loam. Prior to planting of the barley the columns received surface treatments of dolomitic lime (8.4 Mg.ha-1), hog manure (44.8 Mg.ha-1) with and without lime, cow manure (44.8 Mg.ha-1) with and without lime, gypsum (14.6 Mg.ha-1), and EDTA (5.1 Mg.ha-1) with lime. The columns were leached twice weekly over a 6 week period with 5 cm additions of water. Lime alone did not significantly increase subsoil pH or reduce exchangeable Al at depths below 15 cm. The EDTA plus lime treatment caused significant increases in soil pH and reductions in exchangeable Al throughout the column. Gypsum treatments also reduced exchangeable Al but neither gypsum nor EDTA plus lime treatments resulted in Improved barley root growth or rooting depth in the acid subsoil when compared to check columns. Maximum root growth and rooting depths were found in the columns receiving manure treatments with and without lime. Soluble organic components from the manures may have complexed part of the Al and reduced its toxicity. Bulk density values in the manure treated columns were lower than those in the non-manure treated columns at the end of the experiment. This may have contributed to the improved barley root growth in the manure treatments. |
| Uitgever: |
Taylor & Francis |
| Bronbestand: |
Elektronische Wetenschappelijke Tijdschriften |
Details van artikel 140 van 164 gevonden artikelen
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