npk % vs npk ratio
I have potted citrus and use a liquid fert which is:
N - 10%
P - 4%
K - 6%
Plus trace elements Calcium, sodium, magnesium, sulphur, iron, manganese, copper, zinc, and boron.
I understand from a number of posts that the ideal NPK for citrus is 5-1-3.
Also from reading Taplas post on fertilizing container plants that the % for P and K needs to be adjusted to calculate the true ratio.
Specificially P % multiply by 0.43 and K% multiply by 0.83.
On this basis I guess my liquid fert is 10 - 1.72 - 4.98.
Or 10-1.8-5 when rounded.
I have 2 questions. Is my understanding/calulation correct?
And if so is this fert ok for citrus. It's obviously a little light on P and K in relation to the ideal 5-1-3 but pretty close.
Thanks for any help.