2018-19 soybean on black soil, Bundaberg

Posted in PulseCheck–Coastal on Jan 09, 2019

2018–19 summer: Soybean on black soil, Bundaberg

Grower: Department of Agriculture and Fisheries, Bundaberg. This is the first soybean crop grown at the research facility. The crop was planted by a contractor using GPS guided machinery. Tim Behrens is overseeing the field operations.

Location: Kalkie, Bundaberg

Monitored area: 10 ha, black soil (irrigation available)

Pre-plant preparation

  • Cane harvested. Cane stool removed and trash worked into paddock by several cultivation passes including discing, ploughing and rotary hoeing.
  • Knockdown herbicide (RoundUp – Group M glyphosate) applied pre-plant.
  • Sodium molybdate was applied before planting.
  • Soil is known to have high levels of manganese.

Weeks 1–3

Management notes:

  • 12 December 2018 – A6785 soybeans were sown in single rows 650–700 mm apart.
    • Inoculated with Soybean rhizobium group H using water injection.
    • Seeding rate was between 375 000 and 430 000 seeds per ha.
  • 13 December 2018 – Post-emergence and pre-emergence herbicides were applied with Gramoxone for knockdown and Dual Gold for residual weed control.
  • No irrigation required, crop grown on moisture stored from rain events. Approx. 40 mm fell around planting.

Week 4

Management notes:

  • In the coming week, the small weeds present will be removed using interrow cultivation.
  • The roots are nodulating well – large, plump and pink inside.

Week 5:

Management notes:

  • Healthy looking crop with significant growth over the last week.
  • Small amount of old chew damage on leaves but did not see the causal agent.
  • Inter-row cultivation for weed removal.
  • Flower buds are developing.
  • New leaves have a shriveled or ‘bubbled’ appearance.
  • Tim is watching the weather closely before scheduling an irrigation as rain is forecast.

Inter-row cultivation.

Week 6:

Management notes:

  • Crop is green, healthy and filling-out nicely.
  • Moderate amount of chew damage on leaves particularly in middle of rows with several stages of heliothis observed.
  • A small population of jassids were observed.
  • Weed removal operations successfully cleaned up the inter rows, however vine weeds were observed growing within the row and emerging through the crop canopy.
  • Flower buds are still developing with more axillary buds appearing this week.
  • New leaves still have distortions that seem to be resulting in some scarring.
  • 17 January – Irrigation of soybean blocks was underway.

Vines present within the row.

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