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.
- 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
Plot 4 100 kg/ha K-Till Extra (13K) Vs 72 kg/ha Agstar Extra (0K)
*60 kg/ha applied in 2013, 2014, 2015 and 2016
** 60 kg/ha MoP applied in 2013, 2014 and 2015