| Autor: |
K. Baeumer, W. Böhm, R. Stülpnagel, Ulrich Köpke, B.K. Khosla, W. Ehlers |
| Rok vydání: |
1980 |
| Předmět: |
|
| Zdroj: |
Soil and Tillage Research. 1:19-34 |
| ISSN: |
0167-1987 |
| DOI: |
10.1016/0167-1987(80)90005-7 |
| Popis: |
The experiment was carried out in 1976 on a well-drained, loess-derived soil. The general objective was to study the interrelation between root development, water uptake and shoot growth of oats (Avena sativa L.) under field conditions during one growing season. A specific purpose was to determine if regular tillage induces differences in rooting pattern, water uptake and plant growth as compared to untilled soil. In tilled soil a plough-sole layer at 20–30-cm depth induced higher rooting densities within the 10–20-cm layer, but restricted proliferation of roots in deeper layers. Accordingly, total water uptake from the 10–20-cm layer was greater and from the 20–60-cm layer it was less than from untilled soil. Water uptake was particularly limited in the plough-sole layer. The water uptake rate was functionally related to rooting density and soil water potential. Relative growth rate of root length decreased with increasing soil water tension and ended at approximately 19 bar. Tillage favored initial shoot growth, but in June accelerated shoot growth on untilled soil was associated with higher evapotranspiration and a deeper soil exploration by roots. Shoot growth rate was linearly related to transpiration rate. One mm of water use corresponded to a production of 40 kg/ha dry matter. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
|
