Fertilising is easy, just add it to the water when you water. You can either do this at a low level with every watering, or less often at a stronger level. I favour every watering.
You can use the calculator at First Rays to work out how much. Take a look at the NPK value on the fertilser (three numbers, something like 10-5-10 or 4-6-3) Use the first number which is the nitrogen percentage in the calculator. The Target ppmN should be something like 50ppN for using at every watering. That tends to be the current advised way.
https://firstrays.com/free-informati...nt-calculator/
If you need help calculating this, just post your N-P-K value from the packet and someone will be able to help.
At these low levels there is no need to water first, in fact you will waste most of the fertiliser if you do as wet roots won't absorbe it.
---------- Post added at 02:47 PM ---------- Previous post was at 02:45 PM ----------
Quote:
Originally Posted by james mickelso
Pour plain water through the pot, then pour your water with fertilizer (1/4 strength) through. That's all there is to it.
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Sorry, to disagree, but 1/4 strength is meaningless. Depends on what the directions are already on the fertiliser and what strength it is not all of them are the same. Many modern fertilisers already have adjusted for lower concentrations and without knowing what the packet says and how strong the fertiliser is you can't know how it is best used.
My fertiliser is already aimed at the 'low concentration every watering' method, as the makers are some of those that have put forward this idea in recent years. If I was to use it 1/4 strength I would be well below the lowest of the recommendations... I use it at the full strength advised with EVERY watering and WITHOUT putting plain water through first. I just add it to my watering water and use.
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Basically, back in history at some point it was advised to fertilise monthly at a quite strong concentration (I don't know what that was). This strong fertliser caused root burn, so the advice to water with plain water first accompanied it as that stopped the roots absorbing so much fertiliser and avoided root burn.
Then advice changed, it was realised by spreading the same amount of fertiliser more evenly over a month you could also avoid root burn and that the plants responded to a more even feeding regime rather than a starve/feast regime. This is where the 1/4 strength advice originated, but along with it the advice to use plain water first was no longer required, however you WERE advised to flush only plain water through the pot monthly and skip the fertiliser that week.
Now the advice has changed again and the idea is to use even lower levels with every watering, so no watering with plain water even if you water several times a week, just fertiliser in every watering.
Unless you know for sure that your fertliser was aimed at the monthly method, and you want to employ the weekly method, then the 1/4 strength is meaningless.