The effect of boron tolerance, deep ripping with gypsum, and water supply on subsoil water extraction of cereals on an alkaline soil
J. G. Nuttall A C , R. D. Armstrong A and D. J. Connor BA Department of Primary Industries, Private Bag 260, Horsham, Vic. 3401, Australia.
B Institute of Land and Food Resources, The University of Melbourne, Vic. 3010, Australia; present address: Instituto de Agricultura Sostenible (CSIC), Apartado 4084, 14080 Córdoba, Spain.
C Corresponding author. Email: james.nuttall@dpi.vic.gov.au
Australian Journal of Agricultural Research 56(2) 113-122 https://doi.org/10.1071/AR04183
Submitted: 10 August 2004 Accepted: 17 December 2004 Published: 28 February 2005
Abstract
Crop adaptation to edaphic constraints has focussed largely on increasing boron (B) tolerance in cereals, targeted to alkaline soils with high boron content. However, recent studies have implicated several other physicochemical constraints, such as salinity and sodicity, in reduced grain yields of cereals by restricting water extraction in the subsoil. Consequently, the value of B-tolerance may be limited on soils where multiple constraints exist. To test the contribution of B-tolerance where multiple constraints exist, near-isogenic lines of wheat and barley differing in B-tolerance were used, where growth and water extraction by crops in large intact cores, extracted from a Calcarosol profile, were measured. The effect of subsoil disturbance (deep ripping) and growing-season water supply was also investigated. Use of B-tolerant crops did not increase use of subsoil water or grain yield. Wheat and barley extracted soil water down to 0.6 m depth but not below 0.8 m. The soil B concentration of these 2 layers was equivalent (29 ν. 31 mg/kg), whereas salinity [(ECe) 7.2 ν. 8.1 dS/m] and sodicity [(ESP) 22 ν. 29%] both increased significantly with depth, implying that these 2 latter properties had a greater effect than B. Deep ripping with gypsum had no effect on grain yield. Wheat and barley grown under high water supply outyielded their counterparts grown under low water supply, although grain yield per unit of applied water for the crops under low water was 1.5 times that of the crops under high water regime. The results suggest that high salinity and sodicity, rather than B, were exerting the major effects on water extraction of wheat and barley from the deep subsoil, thus negating the effect of crop B-tolerance where multiple constraints exist. This highlights the need to breed cultivars with increased sodium tolerance, pyramided with current B-tolerance, for those crops targeted to many alkaline soils.
Additional keywords: wheat, barley, isogenic lines, salinity, sodicity.
Acknowledgments
The Department of Primary Industries (DPI, Vic.) funded this research, with support from The University of Melbourne, the Birchip Cropping Group, and Nufarm Ltd. The co-operation of J. J. O’Connor, Birchip, in allowing recovery of soil cores from his land, is gratefully acknowledged. Thanks are also due to Tony Fay (DPI, Birchip) for arranging farmer logistics, Vince Matassa for constructive comments on the statistical approach, and David Moody (DPI, Horsham) for supplying seed of near-isogenic lines of barley.
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