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2017 CSBP South East Trial highlights

09 Oct, 2017
In the fifth year of our lime x potassium (K) trial held in Cascades we are still seeing the benefit of applied K every season in low potassium areas.
By Scott Nelson, Esperance District Agronomist

Jeitz lime x potassium trial

In the fifth year of our lime x potassium (K) trial held in Cascades we are still seeing the benefit of applied K every season in low potassium areas. Plant testing conducted on 7 July, showed that treatments 4, 5 and 8 that received K at the start of the season whether it was supplied by K-Till Extra or by Muriate of Potash top-dressed prior to seeding should have enough K to maximse yield, while the other treatments 3, 6 and 7 that didn’t receive potassium in 2017 had marginal levels. Treatments 6 and 7 (residual K) didn’t show any deficiency symptoms and scored quite well in visual appraisals, but plant testing indicated hidden hunger that  may be yield limiting come seasons end.  There was a yield response to lime in 2016 barley but this year there have been no visual responses or effects in plant test results. Earlier seasons have shown that removing K inputs to focus on pH levels with lime inputs was unprofitable and unsustainable. Gross margin analysis showed that the extra profitability from the K applications through increased production well and truly covered the cost of the lime application.

Key messages

  • Regardless of crop type, K can be profitable when applied where levels are low
  • If levels are low, annual application are most profitable
  • Maintaining K inputs when undertaking liming programs is critical to maximise profitability
  • Plant testing and not visual symptom diagnosis is key when assessing crops in field 
Jeitz lime x potassium trial

Plot 4 100 kg/ha K-Till Extra (13K) Vs 72 kg/ha Agstar Extra (0K)


 

2013 & 2016

2013, 2014, 2015, 2016 & 2017

3-Jul

 

Lime

IBS

Banded

K

K

Trt

(t/ha)

(kg/ha)

(kg/ha)

(kg/ha)

(%)

1

-

-

72 Agstar Extra

0

3.8

2

-

120 MoP

72 Agstar Extra

59

5.1

3

2.5 + 2.5

-

72 Agstar Extra

0

2.5

4

2.5 + 2.5

-

100 K-Till Extra Plus

13

3.8

5

2.5 + 2.5

60 MoP

72 Agstar Extra

30

4.3

6*

2.5 + 2.5

-

72 Agstar Extra

0

3.0

7**

2.5 + 2.5

-

72 Agstar Extra

0

2.9

8

2.5 + 2.5

120 MoP

72 Agstar Extra

59

4.7


*60 kg/ha applied in 2013, 2014, 2015 and 2016

** 60 kg/ha MoP applied in 2013, 2014 and 2015


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