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Zone Hervey Bay Qld 4655 | Graham Buck added on June 13, 2019 | Answered

I am currently installing a Fertiliser Injection System through my 24 Drippers I have on plants in my front garden. I can monitor the amount of liquid fertiliser coming from a premixed 20 litre container, however due to fine holes & filter, it is difficult to find an
organic fertiliser that would not cause problems in blockage and continued cleaning and maintenance.
Many chemical Liquid fertilisers are available as a concentrate which I would not wish to use 100% of the time.
I am confused on what to use in a liquid fertiliser containing NPK for my flowering and colourful dwarf plants. After reading many articles on NPK, to do know that continual use of Chemicals may not be advisable.

I do not know what strength of NPK I should look for in a concentrate, or how often I should use an organic type fertiliser. My plants are in a tropical type climate in Qld,

Soil is mainly a garden mix with Clay approx. 250-300mm deep, the clay has been treated for drainage. They were planted over 12 months ago, with weed matting and stones on top.
All looking good at this time. The soil has been treated and dug in with some organic fertiliser when they were planted.

I am 77 yo and need some advice of what liquid fertiliser I should look at using?
how often and strength recommended in NPK. How often I should use. My wife and I are both handicapped and for this reason the system has been installed.

Any advice would be welcome, Thank you

A.Answers to this queston: Add Answer
Certified GKH Gardening Expert
Answered on June 13, 2019

Unfortunately all organic fertilizers will clog up filtration. There will be no options here for organic.

Now on the other hand, you have pharmaceutical grade plant nutrients. They are fully synthetic but simply raw chemicals. They are as pure as nutrients gets without ANY impurities. Since they are raw nutrients, they are even more safe, and effective than organic nutrients, since there is no risk of contamination or going rancid as with organic chemicals, since these usually have organic matter still present. These ingredients can, and will rot over time.

So in short, there are no options for organic nutrients. You will have to use pharmaceutical grade plant nutrients. They have been filtered through a filter much smaller than the filter on your system, at 1 micron.

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