Summer fallow weed control and residue management impacts on winter crop yield though soil water and N accumulation in a winter-dominant, low rainfall region of southern Australia
J. R. Hunt A F , C. Browne B , T. M. McBeath C , K. Verburg D , S. Craig B and A. M. Whitbread C E
+ Author Affiliations
- Author Affiliations
A CSIRO Sustainable Agriculture Flagship, GPO Box 1600 Canberra, ACT 2601, Australia.
B Birchip Cropping Group, Box 85 Birchip, Vic. 3483, Australia.
C CSIRO Sustainable Agriculture Flagship, PB 2 Glen Osmond, SA 5064, Australia.
D CSIRO Sustainable Agriculture Flagship, GPO Box 1666, Canberra, ACT 2601, Australia.
E Current address: Crop Production Systems in the Tropics, University of Goettingen, Germany.
F Corresponding author. Email: James.Hunt@csiro.au
Crop and Pasture Science 64(9) 922-934 https://doi.org/10.1071/CP13237
Submitted: 21 December 2012 Accepted: 9 September 2013 Published: 11 November 2013
Abstract
The majority of rain used by winter grain crops in the Mallee region of Victoria, Australia, falls during the cooler months of the year (April–October). However, rain falling during the summer fallow period (November–March) and stored as soil moisture contributes to grain yield. Strategies to better capture and store summer fallow rain include (i) retention of crop residues on the soil surface to improve water infiltration and evaporation; and (ii) chemical or mechanical control of summer fallow weeds to reduce transpiration. Despite the widespread adoption of no-till farming systems in the region, few published studies have considered the benefits of residue management during the summer fallow relative to weed control, and none quantify the impacts or identify the mechanisms by which summer fallow weeds influence subsequent crop yield.
Over 3 years (2009–11), identical experiments on adjacent sand and clay soil types at Hopetoun in the southern Mallee were conducted to quantify the effect of residue management (standing, removed, or slashed) and summer fallow weed control (± chemical control) compared with cultivation on soil water and nitrogen (N) accumulation and subsequent crop yield. The presence of residue (2.4–5.8 t/ha) had no effect on soil water accumulation and a small negative effect on grain yield on the clay soil in 2011. Controlling summer weeds (Heliotropium europaeum and volunteer crop species) increased soil water accumulation (mean 45 mm) and mineral N (mean 45 kg/ha) before sowing on both soil types in 2 years of the experiment with significant amounts of summer fallow rain (2010 and 2011). Control of summer weeds increased grain yield of canola by 0.6 t/ha in 2010 and wheat by 1.4 t/ha in 2011. Using the data from these experiments to parameterise the APSIM model, simulation of selected treatments using historical climate data (1958–2011) showed that an extra 40 mm of stored soil water resulted in an average additional 0.4 t/ha yield, most of which was achieved in dry growing seasons. An additional 40 kg/ha N increased yield only in wetter growing seasons (mean 0.4 t/ha on both soil types). The combination of extra water and N that was found experimentally to result from control of summer fallow weeds increased subsequent crop yield in all season types (mean 0.7 t/ha on sand, 0.9 t/ha on clay). The co-limitation of yield by water and N in the Mallee environment means that yield increases due to summer weed control (and thus returns on investment) are very reliable.
Additional keywords: APSIM, cultivation, herbicide, no-till, residue retention.
References
Angus J, Good AJ (2004) Dryland cropping in Australia. In ‘Challenges and strategies for dryland agriculture’. Vol. 32. (Eds SC Rao, J Ryan) pp. 151–166. (Crop Science Society of America, American Society of Agronomy: Madison, WI)Angus JF, van Herwaarden AF, Fischer RA, Howe GN, Heenan DP (1998) The source of mineral nitrogen for cereals in south-eastern Australia. Australian Journal of Agricultural Research 49, 511–522.
| The source of mineral nitrogen for cereals in south-eastern Australia.Crossref | GoogleScholarGoogle Scholar | 1:CAS:528:DyaK1cXisFGqt74%3D&md5=81ad1f26df0a4572aa2eebb0ba357ab1CAS |
Asseng S, McIntosh PC, Wang G, Khimashia N (2012) Optimal N fertiliser management based on a seasonal forecast. European Journal of Agronomy 38, 66–73.
| Optimal N fertiliser management based on a seasonal forecast.Crossref | GoogleScholarGoogle Scholar | 1:CAS:528:DC%2BC38XitF2lsLY%3D&md5=2e2ff4c9cbcc4e10f133025e90e9789eCAS |
Bell LW, Kirkegaard JA, Swan A, Hunt JR, Huth NI, Fettell NA (2011) Impacts of soil damage by grazing livestock on crop productivity. Soil & Tillage Research 113, 19–29.
| Impacts of soil damage by grazing livestock on crop productivity.Crossref | GoogleScholarGoogle Scholar |
Bond JJ, Willis WO (1970) Soil water evaporation: first stage drying as influenced by surface residue and evaporation potential. Proceedings – Soil Science Society of America 34, 924–928.
| Soil water evaporation: first stage drying as influenced by surface residue and evaporation potential.Crossref | GoogleScholarGoogle Scholar |
Browne C, Jones B (2008) How important is straw for yield of no-till crops on heavy soils in the low-rainfall southern Mallee? In ‘Global issues, paddock action. Proceedings of 14th Australian Agronomy Conference’. 21–25 September 2008, Adelaide, S. Aust. (Ed. M Unkovich) (Australian Society of Agronomy/The Regional Institute Ltd: Gosford, NSW) Available at: http://regional.org.au/au/asa/2008/concurrent/crop-agronomy/5832_brownec.htm#TopOfPage
Bruce SE, Kirkegaard JA, Pratley J, Howe G (2006) Growth suppression of canola through wheat stubble I. Separating physical and biochemical causes in the field. Plant and Soil 281, 203–218.
| Growth suppression of canola through wheat stubble I. Separating physical and biochemical causes in the field.Crossref | GoogleScholarGoogle Scholar | 1:CAS:528:DC%2BD28Xktlyhtr4%3D&md5=7f94a84f1429e27dfe8d8e3749c6d93bCAS |
Cai W, Cowan T, Thatcher M (2012) Rainfall reductions over Southern Hemisphere semi-arid regions: the role of subtropical dry zone expansion. Scientific Reports 2,
| Rainfall reductions over Southern Hemisphere semi-arid regions: the role of subtropical dry zone expansion.Crossref | GoogleScholarGoogle Scholar | 23050086PubMed |
Carberry PS, Hochman Z, Hunt JR, Dalgliesh NP, McCown RL, Whish JPM, Robertson MJ, Foale MA, Poulton PL, van Rees H (2009) Re-inventing model-based decision support with Australian dryland farmers. 3. Relevance of APSIM to commercial crops. Crop & Pasture Science 60, 1044–1056.
| Re-inventing model-based decision support with Australian dryland farmers. 3. Relevance of APSIM to commercial crops.Crossref | GoogleScholarGoogle Scholar |
Chan KY, Pratley JE (1998) Soil structural decline—can the trend be reversed? In ‘Agriculture and the environmental imperative’. (Eds JE Pratley, AI Robertson) pp. 129–163. (CSIRO Publishing: Melbourne)
Cornish PS, Murray GM (1989) Low rainfall rarely limits wheat yields in southern New South Wales. Australian Journal of Experimental Agriculture 29, 77–83.
| Low rainfall rarely limits wheat yields in southern New South Wales.Crossref | GoogleScholarGoogle Scholar |
CSIRO and BOM (2007) Climate change in Australia. CSIRO/Bureau of Meteorology/Department of Climate Change and Energy Efficiency, Canberra. Available at: www.climatechangeinaustralia.gov.au/resources.php
Dalgliesh NP, Foale MA (1998) ‘Soil matters: monitoring soil water and nutrients in dryland farming.’ (Agricultural Production Systems Research Unit: Toowoomba, Qld)
Felton W, Freebairn DM, Fettell NA, Thomas J (1987) Crop residue management. In ‘Tillage’. (Eds PS Cornish, JE Pratley) pp. 171–193. (Inkata Press: Melbourne)
Fischer RA (1987) Responses of soil and crop water relations to tillage. In ‘Tillage’. (Eds PS Cornish, JE Pratley) pp. 194–221. (Inkata Press: Melbourne)
Flower KC, Cordingley N, Ward PR, Weeks C (2012) Nitrogen, weed management and economics with cover crops in conservation agriculture in a Mediterranean climate. Field Crops Research 132, 63–75.
| Nitrogen, weed management and economics with cover crops in conservation agriculture in a Mediterranean climate.Crossref | GoogleScholarGoogle Scholar |
Foley JL, Silburn DM (2002) Hydraulic properties of rain impact surface seals on three clay soils - influence of raindrop impact frequency and rainfall intensity during steady state. Australian Journal of Soil Research 40, 1069–1083.
| Hydraulic properties of rain impact surface seals on three clay soils - influence of raindrop impact frequency and rainfall intensity during steady state.Crossref | GoogleScholarGoogle Scholar |
Freebairn DM, Boughton WC (1981) Surface runoff experiments on the eastern Darling Downs. Australian Journal of Soil Research 19, 133–146.
| Surface runoff experiments on the eastern Darling Downs.Crossref | GoogleScholarGoogle Scholar |
Freebairn DM, Cornish PS, Anderson WK, Walker SR, Robinson JB, Beswick AR (2006) Management systems in climate regions of the world—Australia. In ‘Dryland agriculture’. Vol. 23. (Eds GA Peterson, PW Unger, WA Payne) pp. 837–878. (American Society of Agronomy Inc., Crop Science Society of America Inc., Soil Science Society of America Inc.: Madison, WI)
French RJ (1978a) Effect of fallowing on yield of wheat. 1. Effect on soil-water storage and nitrate supply Australian Journal of Agricultural Research 29, 653–668.
| Effect of fallowing on yield of wheat. 1. Effect on soil-water storage and nitrate supplyCrossref | GoogleScholarGoogle Scholar |
French RJ (1978b) Effect of fallowing on yield of wheat. 2. Effect on grain-yield Australian Journal of Agricultural Research 29, 669–684.
| Effect of fallowing on yield of wheat. 2. Effect on grain-yieldCrossref | GoogleScholarGoogle Scholar |
French RJ, Schultz JE (1984a) Water-use efficiency of wheat in a mediterranean-type environment: 2. Some limitations to efficiency Australian Journal of Agricultural Research 35, 765–775.
| Water-use efficiency of wheat in a mediterranean-type environment: 2. Some limitations to efficiencyCrossref | GoogleScholarGoogle Scholar |
French RJ, Schultz JE (1984b) Water use efficiency of wheat in a Mediterranean-type environment: 1. The relationship between yield, water use and climate. Australian Journal of Agricultural Research 35, 743–764.
| Water use efficiency of wheat in a Mediterranean-type environment: 1. The relationship between yield, water use and climate.Crossref | GoogleScholarGoogle Scholar |
Fromm G, Grieger V (2002) The effect of summer weed management on subsequent grain yield and quality. In ‘13th Australian Weeds Conference’. 8–13 September 2002, Perth, W. Aust. (Eds H Spafford-Jacob, J Dodd, JH Moore) (Council of Australasian Weed Societies Inc.)
Haskins B, McMaster C (2012) Summer fallow management in 2010 across central west NSW. In ‘Capturing opportunities and overcoming obstacles in Australian agronomy. Proceedings of the 16th Australian Agronomy Conference’. 15–18 October 2012, Armidale, NSW. (Eds I Yunusa, GJ Blair) (Australian Society of Agronomy/The Regional Institute Ltd: Gosford, NSW) Available at: www.regional.org.au/au/asa/2012/soil-water-management/8114_haskinsbj.htm
Hatfield J, Sauer T, Prueger J (2001) Managing soil to achieve greater water use efficiency: a review. Agronomy Journal 93, 271–280.
| Managing soil to achieve greater water use efficiency: a review.Crossref | GoogleScholarGoogle Scholar |
Hochman Z, Holzworth D, Hunt JR (2009a) Potential to improve on-farm wheat yield and WUE in Australia. Crop & Pasture Science 60, 708–716.
| Potential to improve on-farm wheat yield and WUE in Australia.Crossref | GoogleScholarGoogle Scholar |
Hochman Z, Van Rees H, Carberry PS, Hunt JR, McCown RL, Gartmann A, Holzworth D, Van Rees S, Dalgliesh NP, Long W, Peake AS, Poulton PL (2009b) Re-inventing model-based decision support with Australian dryland farmers: 4. Yield Prophet® helps farmers monitor and manage crops in a variable climate. Crop & Pasture Science 60, 1057–1070.
| Re-inventing model-based decision support with Australian dryland farmers: 4. Yield Prophet® helps farmers monitor and manage crops in a variable climate.Crossref | GoogleScholarGoogle Scholar |
Hunt JR (2006) The ecology of common heliotrope (Heliotropium europaeum L.) in a Mediterranean dry-land cropping system. PhD Thesis, The University of Melbourne, Melbourne, Vic., Australia.
Hunt JR, Kirkegaard JA (2011) Re-evaluating the contribution of summer fallow rain to wheat yield in southern Australia. Crop & Pasture Science 62, 915–929.
| Re-evaluating the contribution of summer fallow rain to wheat yield in southern Australia.Crossref | GoogleScholarGoogle Scholar |
Hunt JR, Cousens RD, Knights SE (2009) Heliotropium europaeum only germinates following sufficient rainfall to allow reproduction. Journal of Arid Environments 73, 602–610.
| Heliotropium europaeum only germinates following sufficient rainfall to allow reproduction.Crossref | GoogleScholarGoogle Scholar |
Hunt JR, Swan A, Kirkegaard JA, Breust P, Peoples MB (2011) Do livestock reduce crop yields in conservation farming systems? In ‘5th World Congress on Conservation Agriculture’. 26–29 September 2011, Brisbane, Qld. (ACIAR: Canberra, ACT) Available at: http://aciar.gov.au/files/node/14068/do_livestock_reduce_crop_yields_in_conservation_fa_78907.pdf
Hunt JR, Fettell NA, Midwood J, Breust P, Peries R, Gill J, Paridaen A (2012) Optimising flowering time, phase duration, HI and yield of milling wheat in different rainfall zones of southern Australia. In ‘Capturing opportunities and overcoming obstacles in Australian agronomy. Proceedings of the 16th Australian Society of Agronomy Conference’. 14–18 October 2012, Armidale, NSW. (Australian Society of Agronomy/The Regional Institute Ltd: Gosford, NSW) Available at: www.regional.org.au/au/asa/2012/crop-development/8186_huntjr.htm
Isbell RF (2002) ‘The Australian Soil Classification.’ Revised edn (CSIRO Publishing: Melbourne)
Jeffrey SJ, Carter JO, Moodie KB, Beswick AR (2001) Using spatial interpolation to construct a comprehensive archive of Australian climate data. Environmental Modelling & Software 16, 309–330.
| Using spatial interpolation to construct a comprehensive archive of Australian climate data.Crossref | GoogleScholarGoogle Scholar |
Keating BA, Carberry PS, Hammer GL, Probert ME, Robertson MJ, Holzworth D, Huth NI, Hargreaves JNG, Meinke H, Hochman Z, McClean G, Verburg K, Snow V, Dimes JP, Silburn M, Wang E, Brown S, Bristow KL, Asseng S, Chapman S, McCown RL, Freebairn DM, Smith CJ (2003) An overview of APSIM, a model designed for farming systems simulation. European Journal of Agronomy 18, 267–288.
| An overview of APSIM, a model designed for farming systems simulation.Crossref | GoogleScholarGoogle Scholar |
Kirkegaard JA, Hunt JR (2010) Increasing productivity by matching farming system management and genotype in water-limited environments. Journal of Experimental Botany 61, 4129–4143.
| Increasing productivity by matching farming system management and genotype in water-limited environments.Crossref | GoogleScholarGoogle Scholar | 1:CAS:528:DC%2BC3cXhtlShtLnL&md5=ce25d283d6c674066761e5600b318ab7CAS | 20709725PubMed |
Kirkegaard JA, Munns R, James RA, Gardner PA, Angus JF (1995) Reduced growth and yield of wheat with conservation cropping. 2. Soil biological factors limit growth under direct drilling. Australian Journal of Agricultural Research 46, 75–88.
| Reduced growth and yield of wheat with conservation cropping. 2. Soil biological factors limit growth under direct drilling.Crossref | GoogleScholarGoogle Scholar |
Kirkegaard J, Lilley JM, Verburg K, Bond W (2007) Fallow management, water storage and wheat yield in southern NSW. GRDC 2007 Adviser Update, 2007, Wagga Wagga, NSW. Available at: www.grdc.com.au/uploads/documents/cecc/CSO232/Attachment%204%20CSO232%20Final%20Report.pdf
Lilley JM, Kirkegaard JA (2007) Seasonal variation in the value of subsoil water to wheat: simulation studies in southern New South Wales. Australian Journal of Agricultural Research 58, 1115–1128.
| Seasonal variation in the value of subsoil water to wheat: simulation studies in southern New South Wales.Crossref | GoogleScholarGoogle Scholar |
Lilley JM, Probert ME, Kirkegaard J (2004) Simulation of deep drainage under a 13-year crop sequence in southern NSW. In ‘4th International Crop Science Congress’. 26 September–1 October 2004, Brisbane, Qld. (Ed. RA Fischer) (ICSC/The Regional Institute Ltd: Gosford, NSW) Available at: www.regional.org.au/au/asa/2004/poster/1/6/1306_lilleyjm.htm
Llewellyn RS, D’Emden FH, Kuehne G (2012) Extensive use of no-tillage in grain growing regions of Australia Field Crops Research 132, 204–212.
| Extensive use of no-tillage in grain growing regions of AustraliaCrossref | GoogleScholarGoogle Scholar |
Moeller C, Asseng S, Berger J, Milroy SP (2009) Plant available soil water at sowing in Mediterranean environments-Is it a useful criterion to aid nitrogen fertiliser and sowing decisions? Field Crops Research 114, 127–136.
| Plant available soil water at sowing in Mediterranean environments-Is it a useful criterion to aid nitrogen fertiliser and sowing decisions?Crossref | GoogleScholarGoogle Scholar |
Moore AD, Hunt JR (2012) Does control of summer fallow weeds improve whole-farm productivity in both Mediterranean and temperate environments? In ‘Capturing opportunities and overcoming obstacles in Australian agronomy. Proceedings of the 16th Australian Society of Agronomy Conference’. 14–18 October 2012, Armidale, NSW. (Australian Society of Agronomy/The Regional Institute Ltd: Gosford, NSW) Available at: www.regional.org.au/au/asa/2012/soil-water-management/8145_mooread.htm
O’Leary GJ, Connor DJ (1997a) Stubble retention and tillage in a semi-arid environment: 1. Soil water accumulation. Field Crops Research 52, 209–219.
| Stubble retention and tillage in a semi-arid environment: 1. Soil water accumulation.Crossref | GoogleScholarGoogle Scholar |
O’Leary GJ, Connor DJ (1997b) Stubble retention and tillage in a semi-arid environment: 2. Soil mineral nitrogen accumulation during fallow. Field Crops Research 52, 221–229.
| Stubble retention and tillage in a semi-arid environment: 2. Soil mineral nitrogen accumulation during fallow.Crossref | GoogleScholarGoogle Scholar |
O’Leary GJ, Connor DJ (1997c) Stubble retention and tillage in a semi-arid environment: 3. Response of wheat. Field Crops Research 54, 39–50.
| Stubble retention and tillage in a semi-arid environment: 3. Response of wheat.Crossref | GoogleScholarGoogle Scholar |
Oliver YM, Robertson MJ, Weeks C (2010) A new look at an old practice: Benefits from soil water accumulation in long fallows under Mediterranean conditions. Agricultural Water Management 98, 291–300.
| A new look at an old practice: Benefits from soil water accumulation in long fallows under Mediterranean conditions.Crossref | GoogleScholarGoogle Scholar |
Osten V, Hashem A, Koetz E, Lemerle D, Pathan S, Wright G (2006) Impacts of summer fallow weeds on soil nitrogen and wheat in the southern, western and northern Australian grain regions. In ‘15th Australian Weeds Conference: Managing Weeds in a Changing Climate’. 24–28 September 2006, Adelaide, S. Aust. (Eds C Preston, JH Watts, ND Crossman) (Council of Australasian Weed Societies Inc.)
Passioura JB, Angus J (2010) Improving productivity of crops in water-limited environments. Advances in Agronomy 106, 37–75.
| Improving productivity of crops in water-limited environments.Crossref | GoogleScholarGoogle Scholar |
Pook M, Lisson S, Risbey J, Ummenhofer CC, McIntosh P, Rebbeck M (2009) The autumn break for cropping in southeast Australia: trends, synoptic influences and impacts on wheat yield. International Journal of Climatology 29, 2012–2026.
| The autumn break for cropping in southeast Australia: trends, synoptic influences and impacts on wheat yield.Crossref | GoogleScholarGoogle Scholar |
Ridge PE (1986) A review of long fallows for dryland wheat production in southern Australia. The Journal of the Australian Institute of Agricultural Science 52, 37–44.
Sadras V, Angus J (2006) Benchmarking water-use efficiency of rainfed wheat in dry environments. Australian Journal of Agricultural Research 57, 847–856.
| Benchmarking water-use efficiency of rainfed wheat in dry environments.Crossref | GoogleScholarGoogle Scholar |
Sadras VO, Lawson C, Hooper P, McDonald GK (2012) Contribution of summer rainfall and nitrogen to the yield and water use efficiency of wheat in Mediterranean-type environments of South Australia. European Journal of Agronomy 36, 41–54.
| Contribution of summer rainfall and nitrogen to the yield and water use efficiency of wheat in Mediterranean-type environments of South Australia.Crossref | GoogleScholarGoogle Scholar |
Schultz JE (1972) The effect of surface treatments on soil water storage and yield of wheat. Australian Journal of Experimental Agriculture and Animal Husbandry 12, 299–305.
| The effect of surface treatments on soil water storage and yield of wheat.Crossref | GoogleScholarGoogle Scholar |
Scott BJ, Eberbach PL, Evans J, Wade LJ (2010) ‘: Stubble retention in cropping systems in southern Australia: Benefits and challenges.’ EH Graham Centre Monograph No. 1. (Industry & Investment NSW: Wagga Wagga, NSW) Available at: www.csu.edu.au/research/grahamcentre/
Tisdall JM, Oades JM (1982) Organic-matter and water stable aggregates in soils. Journal of Soil Science 33, 141–163.
| Organic-matter and water stable aggregates in soils.Crossref | GoogleScholarGoogle Scholar | 1:CAS:528:DyaL38XlsVels7w%3D&md5=0c1e5d7af76b5c178ee39696f262167cCAS |
Verburg K, Bond WJ, Hirth JR, Ridley AM (2007) Lucerne in crop rotations on the Riverine Plains: 3. Model evaluation and simulation analyses. Australian Journal of Agricultural Research 58, 1129–1141.
| Lucerne in crop rotations on the Riverine Plains: 3. Model evaluation and simulation analyses.Crossref | GoogleScholarGoogle Scholar |
Verburg K, Bond WJ, Hunt JR (2012) Fallow management in dryland agriculture: Explaining soil water accumulation using a pulse paradigm Field Crops Research 130, 68–79.
| Fallow management in dryland agriculture: Explaining soil water accumulation using a pulse paradigmCrossref | GoogleScholarGoogle Scholar |
Victorian Department of Primary Industries (2012) Mallee soils. Victorian Resources Online. Department of Primary Industries, Victoria. Available at: http://vro.dpi.vic.gov.au/dpi/vro/malregn.nsf/pages/mallee_soil_index
Ward P, Whisson K, Micin S, Zeelenberg D, Milroy S (2009) The impact of wheat stubble on evaporation from a sandy soil. Crop & Pasture Science 60, 730–737.
| The impact of wheat stubble on evaporation from a sandy soil.Crossref | GoogleScholarGoogle Scholar |
Ward PR, Flower KC, Cordingley N, Weeks C, Micin SF (2012) Soil water balance with cover crops and conservation agriculture in a Mediterranean climate. Field Crops Research 132, 33–39.
| Soil water balance with cover crops and conservation agriculture in a Mediterranean climate.Crossref | GoogleScholarGoogle Scholar |
Whitbread AM, Blair GJ, Lefroy RDB (2000) Managing legume leys, residues and fertilisers to enhance the sustainability of wheat cropping systems in Australia 2. Soil physical fertility and carbon. Soil & Tillage Research 54, 77–89.
| Managing legume leys, residues and fertilisers to enhance the sustainability of wheat cropping systems in Australia 2. Soil physical fertility and carbon.Crossref | GoogleScholarGoogle Scholar |
