Claire Browne (BCG)
James Hunt (BCG)
Therese McBeath (CSIRO)
|Contributor||Birchip Cropping Group|
To quantify how paddock stubble load and weed burden during summer can affect available soil water, nutrients and subsequent crop yield.
Controlling summer weeds conserved both water and nitrogen and doubled wheat yields in 2011 on both sand and clay soil types. Retaining or removing stubble has only minor effects on wheat yield. Complete control of summer weeds pays, and there is no excuse for weedy paddocks during summer in the Wimmera and Mallee!
|Lead research organisation||N/A|
|Host research organisation||N/A|
|Trial funding source||GRDC BWD00012,CPS00111|
This project was funded by GRDC projects BWD00012 Yielding benefits through partnerships and CPS00111 Identifying farm-scale opportunities to improve WUE: A nationally coordinated systems approach.
|Other trial partners||Not specified|
|Sow date||29 April 2011|
|Harvest date||Not specified|
|Plot size||Not specified|
55kg/ha MAP at sowing, 21kg/ha N top-dressed as ammonium sulfate on 1 July.
|@T1: Pre Sowing|
||Gross margin ($/ha)||Grain yield (t/ha)||Mineral N (kg/ha)|
|1||█ Standing stubble||298||3.7||131|
|1||█ Standing stubble + summer weeds||126||2.2||77|
|2||█ Slashed stubble||346||4.2||123|
|2||█ Bare earth||304||3.7||105|
|3||█ Bare earth + summer weeds||84||2.1||70|
|Rainfall trial gsr (mm)||198mm|
SILO weather estimates sourced from https://www.longpaddock.qld.gov.au/silo/
Jeffrey, S.J., Carter, J.O., Moodie, K.B. and Beswick, A.R. (2001). Using spatial interpolation to construct a comprehensive archive of Australian climate data , Environmental Modelling and Software, Vol 16/4, pp 309-330. DOI: 10.1016/S1364-8152(01)00008-1.