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RESEARCH ARTICLE

Delving of sandy surfaced soils reduces frost damage in wheat crops

M. Rebbeck A , C. Lynch A , P. T. Hayman A and V. O. Sadras A B C
+ Author Affiliations
- Author Affiliations

A South Australian R&D Institute, Waite Precinct, GPO Box 397, Adelaide, SA 5001, Australia.

B School of Agriculture, Food and Wine, The University of Adelaide, Waite Precinct, Adelaide, SA 5001, Australia.

C Corresponding author. Email: sadras.victor@saugov.sa.gov.au

Australian Journal of Agricultural Research 58(2) 105-112 https://doi.org/10.1071/AR06097
Submitted: 24 March 2006  Accepted: 16 October 2006   Published: 22 February 2007

Abstract

Delving is a farming practice involving the mixing of a deep clayey subsoil layer with a sandy topsoil. One of the many effects of this practice is to reduce soil albedo and increase water-holding capacity of the topsoil, thus increasing the potential for storage and release of heat and potential attenuation of the effects of radiative frost. At Keith, a frost-prone location of South Australia, we investigated the effect of management practices with putative capacity to reduce frost damage, with emphasis on delving. Three field experiments were established on Brown Sodosols with a water-repellent sand topsoil.

In relation to crops in untreated control soil, delving increased wheat yield from 1.9 to 3.1 t/ha in 2003, and from 0.5 to 1.5 t/ha in 2004. This large delving effect contrasted with the minor effects of other treatments including soil rolling, sowing rate, row spacing, and cultivar mixture. Lack of significant interactions between treatments indicated a robust response to delving across a range of management practices.

Topsoil and canopy-height minimum temperatures were consistently higher in the delved treatment. The average difference in canopy-height minimum temperature between delved and control treatments was 0.3–0.4°C, with a maximum of 1.6°C in 2003 and 1.2°C in 2004. A single, robust relationship between yield and frost damage fitted the data pooled across treatments and seasons. This, together with the temperature differential between treatments, and significant relationships between minimum canopy-height temperature around flowering and frost damage supported the conclusion that a substantial part of the yield gain attributable to delving was related to reduced frost damage.

Additional keywords: yield, protein, grain number, grain size, temperature, canopy.


Acknowledgments

We thank the Grains Research and Development Corporation of Australia for financial support (grant DAS 00017), the Frost Project Steering Committee and McKillop Farm Group for input in project design, Trevor Menz for field facilities, and F. Charman-Green and B. Alexander for assistance with data processing.


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