Soil exploration by sorghum root systems in wide row cropping systems

Broad, Ian and Hammer, Graeme (2004). Soil exploration by sorghum root systems in wide row cropping systems. In: T. Fischer, N. Turner, J. Angus, L. McIntyre, M. Robertson, A. Borrell and D. Lloyd, New Directions for a Diverse Planet: Proceedings of the 4th International Crop Science Congress. 4th International Crop Science Congress, Brisbane, Australia, (1-5). 26 September-1 October 2004.


Author Broad, Ian
Hammer, Graeme
Title of paper Soil exploration by sorghum root systems in wide row cropping systems
Conference name 4th International Crop Science Congress
Conference location Brisbane, Australia
Conference dates 26 September-1 October 2004
Proceedings title New Directions for a Diverse Planet: Proceedings of the 4th International Crop Science Congress
Place of Publication Gosford, N.S.W., Australia
Publisher The Regional Institute
Publication Year 2004
Sub-type Fully published paper
ISBN 1 920842 20 9
1-920842-21-7
Editor T. Fischer
N. Turner
J. Angus
L. McIntyre
M. Robertson
A. Borrell
D. Lloyd
Volume CD
Start page 1
End page 5
Total pages 5
Collection year 2004
Language eng
Abstract/Summary Wide and ‘skip row’ row configurations have been used as a means to improve yield reliability in grain sorghum production. However, there has been little effort put to design of these systems in relation to optimal combinations of root system characteristics and row configuration, largely because little is known about root system characteristics. The studies reported here aimed to determine the potential extent of root system exploration in skip row systems. Field experiments were conducted under rain-out shelters and the extent of water extraction and root system growth measured. One experiment was conducted using widely-spaced twin rows grown in the soil. The other experiment involved the use of specially constructed large root observation chambers for single plants. It was found that the potential extent of root system exploration in sorghum was beyond 2m from the planted rows using conventional hybrids and that root exploration continued during grain filling. Preliminary data suggested that the extent of water extraction throughout this region depended on root length density and the balance between demand for, and supply of, water. The results to date suggest that simultaneous genetic and management manipulation of wide row production systems might lead to more effective and reliable production in specific environments. Further study of variation in root-shoot dynamics and root system characteristics is required to exploit possible opportunities.
Subjects E1
340299 Applied Economics not elsewhere classified
720399 International trade issues not elsewhere classified
Keyword Sorghum
Roots
Water extraction
Skip rows
Root chambers
Q-Index Code E1

 
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Created: Thu, 23 Aug 2007, 20:02:50 EST