I think over the years people start to apply the EI method to that of liquid ferts too which suggests why even liquid ferts are suggested to be dosed daily.
I think you have to see it from a commercial point. If a manufacturer would say you should dose daily, many (first timers) wouldn't buy their product..."pfffff to much work, I buy that easy one"....
Some people will find it a lot harder, just like weekly or twice weekly water changes, feeding fish has instant results they can be seen to eat it, also lfs still hung up on removing nitrogen phosphorus etc etc from tanks so adding daily would make them shudder, all branded ferts are aimed towards the masses not just those who have done a little more research.I'm not sure I buy into that either. We manage to feed our fish every day so how much harder would it be to add 1 pump (using Tropica once more as an example as their pump system is easy) of ferts each day.
I think I may email Tropica later.
I dose daily because the chelators used in liquid ferts don't work for long in the aquarium before the iron precipitates out and isn't as readily available to the plants. Depends on which chelator is used and your water stats, but they often only remain effective for a few hours once dosed.
Dosing daily improves availability of iron and other chelated nutrients to the plants.
Response from Tropica:
I have read the tread on ukaps and understand your confusion. You’re right, it is always better to dose frequently and in smaller quantities than to dose more rarely and in greater quantities. The plants prefer to be fed regularly – like humans. When fertilizers are added more rarely, the plants might get hungry, adapt to the environment lacking fertilizers and need time to re-adapt when fertilizers are dosed again.
We recommend dosing weekly as many tanks have plants with a steady and slowly growth, and in that case, it’s okay to dose weekly. In addition, many aquatic hobbyists only spend time on their tank once a week, if not even rarer. However, in tanks with rapidly growing plants, the plants need a dosage several times a week to ensure the best possible growth conditions. In our test laboratory, we usually dose 2-3 times a week.
I hope this answers your question.
Could you not have just PM'd Mick.dk on here