If your soil is too acidic or too alkaline, your plants won’t be able to get all the nutrients they need, no matter how much fertilizer you add. Test your soil pH to ensure your soil is between 6 and 7.
- Too acid? If your soil test indicates that your soil pH is too low or too acidic (which applies to most Australian soils) the solution is to add agricultural lime or dolomite. You can also use poultry manure.
- Too alkaline? If your soil is alkaline, it means it has a high pH. You can increase the acidity of your soil by adding things like compost and manures, leaf litter and mulch. Iron chelates work too. In extreme situations, you can use powdered sulphur – one handful per square metre, once a year. Sulphur works very slowly and you won’t notice a change in your pH for about 6 months.
pH testing kits are widely available from nurseries and hardware stores.