Plant Nutrition Deficiencies: Macro Nutrient NitrogenThe 'Plant health' segment was created for my radio show "Real World Gardener,' as a division of the 'Plant doctor' segment, because I felt that it’s important to focus on what can go wrong with plants that isn’t a pest or a disease.
In the following audio podcasts, you will hear about what to look for in plants that have deficiencies of one of the macro nutrients: Nitrogen:Phosphorus:Potassium; in other words NPK or the macro nutrients.
Gardeners can often see problems appearing first in the colour of the leaves, but this can also be followed closely by lack of vigour, stunted growth and general unthriftiness of the plant.
Macro Nutrient Nitrogen
Nitrogen is one of the three big nutrients or macro nutrients that plants need.
Plant Nutrition Deficiencies:Phosporus and Potassium
- In fact there are three major nutrients which are classified as NPK ratio on the back of all fertilisers. So in this part of the blog, we carry on with the two other major or macro nutrients.
Let's look at phosphorus deficiency
- Phosporus is known as a mobile nutrient which can move around the plant to where it's needed.
- Phosphorus deficiency happens more often in cold weather or gardens receive high rainfall, or a combination of both.
- Often affects heavily fruiting plants such as citrus.
- N..B. native plants are highly sensitive to phosphorus, so avoid spreading phosphate fertilisers near these plants.
Let's look at potassium deficiency
I would recommend becoming familiar with the NPK ration on fertilisers, whether organic or not to see if you’re applying the right sort for your plants.
For example, fertilisers that promote flowering and fruiting have higher ratios of potassium than those that are just for general purpose fertilising.
If you have any questions you can email us Realworldgardener@gmail.com or write in to 2rrr, PO Box 644 Gladesville NSW 1675.