Melanie Kupsch (Kunesh)
Anne Smith (DAFWA)
Christine Zaicou-Kunesch (Kunesh)
|Contributor||North East Farming Futures|
Ardingly South, WA
To improve crop production by determining the effect of sowing time and sowing rate on crop yield and grain quality risks of new wheat varieties.
There was no influence of seeding rate on crop production in 2012 at Mullewa when the crop was sown close to the break. However there was a yield penalty with the higher seeding rate when the sowing time was delayed by a month. These results are in contrast to 2011 at Mullewa . Increasing seeding rate increased crop production when sown close to the break and there was no effect on roduction with increasing seeding rate when seeding was delayed.
Emergence was staggered for the first sown treatments only. This is because seeding was on the 11th May into a drying seed bed. It had rain ed in April and early May. The second sowing time was on the 7th June. Rainfall in June was 56 mm.The seeding rate treatments targeted 100, 200 and 300 plants/m2. The actual plant population was 100, 147 and 200 plants/m2 respectively (averaged across variety and sowing time). The range in ears produced across treatments was not large however it was a significantly different between the highest (145 ears/m2) and the lowest seeding rate (137 ears/2) (ave across variety and sowing time).
At Mullewa, there was no interaction between seeding rate, sowing time and variety on crop yield. However, there was an interaction between seeding rate and sowing time on crop production for all varieties. When sown close to the break of the season, changing seeding rates did not affect crops yields significantly. In contrast to the first sowing time, the grain yield (averaged across all varieties) was significantly reduced at the higher actual plant population compared to the middle and lower targe ted plant populations of 100 and 147 plants/m2. Delaying seeding by a month later, reduced crop production by 500 - 600 kg/ha. This equates to 20kg/day/ha.
Emu Rock, Mace and Corack were the higher yielding varieties at each sowing time. Emu Rock and Mace are AH varieties, Corack is an APW variety.
There was no influence of seeding time, plant density or variety on grain protein (P>0.05). Initial assessment of grain screenings includes whole and cracked grain. Except for Emu Rock, screenings of all varieties were lower than 5% when sown at the first sowing time (P<0.05). Observations of Emu Rock at harvest suggest the screenings are a result of mechanical damage, rather than small grain (further measurements are to be undertaken to assess this).
|Lead research organisation||
North East Farming Futures
|Host research organisation||N/A|
|Trial funding source||GRDC DAW00218|
|Trial funding source||DAFWA|
Wheat Agronomy-building system profitability in the Western Region
|Other trial partners||Not specified|
|Sow rate or Target density||Targeting 100, 200, 300 plants/m2|
|Sow date||11 May 2012 11th May 2012 and 7th June 2012|
|Harvest date||Not specified|
|Plot size||20m x 1.54m|
TOS 1: 11 May, 80 kg/ha Agras Xtra drilled with seed + 60kg/ha Urea topdressed.
TOS1: 11 - May, sprayed 100mL/ha Dominex +1.5 L/ha Triflur X + 1L/ha Sprayseed
TOS2: 07 - Jun, 80 kg Agras Xtra +50kg/ha 50 kg/ha Urea
TOS1+2: 25 - Jun, 0.5 L/ha Hasten + 700 mL/ha Velocity
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.