Pay attention to yellowing of the leaves on your tree which could indicate nitrogen deficiency. This is often caused by sandy soil lacking in organic matter. Along with fertiliser to add nitrogen, you also need to improve the quality of your soil over time by adding organic matter.
Take care when applying fertilizers. Trees generally need a high nitrogen fertilizer. Adding a fertilizer that has too much of other macronutrients such as phosphorus (P), potassium (K) and sulphur (S) or adding to much of a high nitrogen fertilizer in a short time can damage your tree. A soil test can determine the right balance of nutrients that your tree needs.
Remember that simply adding chemical fertilizer is a temporary solution that will not improve the overall health of your soil. This is why we recommend a long term sustainable approach. This means improving soil health and structure, by adding plenty of organic matter and mulching as well as adding fertilizers.