2018-19 soybean on grey soil, Bundaberg

Posted in PulseCheck–Coastal on Jan 09, 2019

2018–19 summer: Soybean on grey soil, Bundaberg

Grower: Chapman Family. With 20 years experience with soybeans Tony does his own crop monitoring, ably assisted by his son Mitch.

Farming system: The Chapmans run all farming operations, including the soybeans, under a controlled traffic and zonal tillage system. They follow a 5-year rotation of plant cane + 3 ratoons followed by either peanut or soybean, then field pea before returning to plant cane in spring.

Location: Calavos, Bundaberg

Monitored area: 20 ha irrigated block, grey soil

Pre-plant preparation

  • 23 October 2018 – cane harvested. Cane stool was removed using a zonal tillage implement to cultivate the bed area (1.2 m) only. Knockdown (RoundUp – Group M glyphosate) herbicide applied to control volunteer cane and broad spectrum of weeds.

Zonal tillage implement – discs, coulter, ripper and roller.

Weeks 1–3 weeks

Management notes:

  • 10 December 2018 – A6785 soybeans direct drilled into the beds at a sowing rate of 450,000 seeds per ha. Good soil moisture profile. Four rows per bed, 280 mm apart. Controlled traffic, wheel spacing 1.83 m.
  • 12 December 2018 – Post-plant pre-emergence herbicide application of knockdown (Grammoxone – Group L paraquat) and residual (Dual Gold – Group K s-metolachlor) for early weed control.
  • 26 December 2018 – Top-dressing of soluble fertiliser – sodium molybdenum, zinc and urea.

Week 4

Management notes:

  • 31 December 2018 – Vezir herbicide (Group B imazethapyr) applied to control emerging weeds and to provide residual control.
  • 3 January 2019 – low pressure overhead irrigation.
  • Tony is monitoring heli size and numbers and considering a Vivus Max spray as the crop begins to flower.

Week 5

Management notes:

  • Ratooning cane and grass weeds emerging through the soybean crop are being monitoring to time a Verdict herbicide spray
  • A moderate amount of leaf damage was observed and a few Heliothis, as well as a small number of silverleaf whitefly.
  • The crop canopy on the beds is starting to close, which will crowd out emerging weeds.
  • Flower buds are developing.
  • An irrigation is scheduled for the coming week as well as continued monitoring for flowering and heliothis for correct timing of Vivus Max.

Flower buds forming

Week 6:

Management notes:

  • A significant amount of leaf damage was observed as well as several stages of Heliothis and a small population of silverleaf whitefly.
  • The crop canopy has almost closed over the beds, which has slowed the growth of ratooning cane and grass weeds in some areas.
  • Flower buds are still developing with several more axillary buds appearing this week.
  • An irrigation has been completed within the last 48 hours.
  • This coming week Tony plans to spray Vivus Max for the heliothis, which have exceeded the threshold, as well as a post-emergence grass herbicide (Verdict) before the canopy completely closes in.

Helis are causing economic damage and will be treated this coming week with Vivus Max.

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