Managing micronutrient deficiencies in cropping systems. Zinc at Wunkar

2015

Research organisaton
Funding source

Trial details

Researcher(s) Nigel Wilhelm, Sjaan Davey
Year(s) 2015
Contributor South Australian Research and Development Institute
Trial location(s) Site 2, Wunkar, SA
Managing micronutrient deficiencies in cropping systems. Zinc at Wunkar locations
Aims

To asses the effect on crop yield of multiple rates and application strategies of micronutrient fertilizers in soils deficient in the target micronutrients (copper, zinc, manganese, boron and molybdenum)

Key messages

From this trial:

  • Grain yield increased by 7% with the addition of zinc. Effectiveness of fertiliser strategies could not be assesed with such a small increase in yield. Soil and plant tests were in the deficient range. At Z14 zinc enriched fertilisers at sowing increased leaf zinc. At Z30 a sulphate as a foliar was as effective as an EDTA chelate. 

From the whole project:

  • Current guidelines are still relevant and effective for TE management.
  • Some current interpretations of soil tests are causing issues - the suggested levels to avoid deficiencies are much higher in some lab reports than is our experience from field trials. These are creating false impressions of the extent and severity of Zn and Cu deficiencies.
  • No evidence of a major increase in the incidence or severity of TE deficiencies in the cropping zones.
  • Fluid delivery of TEs at seeding is a valid management strategy but rates of the target TE need to be the same as used with compounded fertilisers.
  • Generally, all sources of foliar TE were equally effective.
Lead research organisation South Australian Research and Development Institute
Host research organisation N/A
Trial funding source GRDC DAS00146
Related program More Profit from Crop Nutrition
Acknowledgments

This project was linked closely with a similar project in WA project code DAW00239, managed by Dr Ross Brennan, DPIRD.


Other trial partners Not specified

Method

Crop type Wheat
Treatment type(s)
  • Fertiliser
  • Fertiliser: Rate
  • Fertiliser: Timing
  • Fertiliser: Application
  • Fertiliser: Method
Trial type Experimental
Trial design Replicated

Wunkar 2015

Sow date Not specified
Harvest date Not specified
Plot size Not specified
Plot replication 4
Fertiliser

District rates of basal fertilisers

 

Download results

Trial results Table 1

@T1: Z14 @T2: Z30
# Treatment 1
Grain yield (t/ha) Soil Zinc in top 10cm (mg DTPA Zn/kg) Tissue Zinc (mg Zn/kg) Tissue Zinc (mg Zn/kg)
1 Nil Control 1.8 1.19 17.2 -
1 Seed dressing (120g Zn/ha) 1.8 17.7 -
1 Granular fertiliser at seeding (1kg Zn/ha) 1.96 20.8 -
2 Granular fertiliser at seeding (0.5kg Zn/ha) 1.88 19.5 -
2 Coated fert product (Zn = 0.5 kg/ha) 1.91 21 -
2 Fluid banded near seed row (1.0 Zn kg / ha) 1.78 16.2 -
3 Foliar spray sulphate (330g Zn/ha) 1.89 - 19.3
3 Foliar spray sulphate(300g Zn/ha) 1.84 - 19.3
3 Foliar spray chelate (300g Zn/ha) 1.88 - 19.8
4 Foliar spray sulphate x 2 (330 + 330g Zn/ha) 1.75 - 19.3
4 Seed dressing + early foliar (120g + 330g Zn/ha) 1.83 - 19.3
4 Luxury management (120g + 1kg + 1.5kg + 330g Zn/ha) 1.94 31 31
5 Fluid banded near seed row (0.13 Zn kg / ha) 1.7 - -
5 Fluid banded near seed row (0.25 Zn kg / ha) 1.84 - -
5 Fluid banded near seed row (0.5 Zn kg / ha) 1.83 - -
6 Fluid banded near seed row (0.75 Zn kg / ha) 1.73 - -
6 Fluid banded near seed row (1.5 Zn kg / ha) 1.84 - -
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Grain yield t/ha


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Soil Zinc in top 10cm mg DTPA Zn/kg


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Tissue Zinc mg Zn/kg


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Trial last modified: 09-10-2019 14:12pm AEST