Did you untangle the roots before you planted it? Sometimes a plant's roots wrap around the tap root and strangle it. I would dig it up, check that the roots are free, and ammend the soil with some perlite or coarse sand. Don't fertilize a sick plant - find out what's wrong and get that fixed before giving it nutrients it can't take up through it's non-working roots. You can take it to a grower's nursery or your local extension office for a diagnosis and hands-on advice.

Yep, i have untangled, the roots are free. I've noticed that the soil where this plant are stays a lot more humid than my others plant's soil that has plants with same age and botanic genus., its like you said , the roots appears to be not-active. Can it be caused by a fungal disease? the old leaves appears to be good.