When using a controlled release fertiliser may be a better option

If liquid feed is not working in a crop because of low water use, a controlled release fertiliser product may be a better option. Read this page to understand what factors you need to consider.

What is controlled release fertiliser?

Controlled release fertilisers are also known as CRFs, they are a granular form of fertiliser that releases nutrients over time. There are different CRF products and the time for releasing nutrient will vary according to the crop they are designed for.

How are they used?

The CRF is mixed into the growing media as additional fertiliser to the base feed that is already there.
The product used should release nutrients over the life of the crop you are growing.
If the right CRF is being used it shouldn’t need extra feed.
They should give a steady supply of feed as the crop grows.
They are sensitive to temperature and growing media EC should still be monitored.

What are the benefits of controlled release fertiliser

A controlled release fertiliser doesn’t rely on irrigation water as the delivery method, so it allows the link between water use and irrigation to be broken and is beneficial in periods/crops of low water use.

Consider Switching if:

You are growing at low temperature and water use is low
Your crop has a low water demand but high feed requirement
Your crop is sensitive to high EC, so you can’t increase the feed/water ratio in your dosing system.

Useful links

Interactions between irrigation method and liquid feed in bedding crops

Interactions between growing media and liquid feed

What level of electrical conductivity should I have in my bedding crop?

Authors

Hilary Papworth (NIAB) and Benjamin Tea (NIAB)

Topics:

Nutrition Bulbs & Outdoor Flowers Hardy Nursery Stock Protected Ornamentals

Sectors:

Horticulture