Please help ID Pygmy Date Palm Deffeciency
In south florida, my robellini leaves turning brown, soil pH 7.5+ tested with selfkit, near asphalt driveway. I have feed with 13-3-3 fertilizer with no boron or manganese during last 6 months (not too much). I had suspicion it is manganese defficiency and watered one set of trees(triples) with almost 8 oz of manganese suplhate dis. in rain water about 20 days ago, then i watered with epsom salt 2 tablespoons in 3 gal rain water like 10 days ago.
I have another triple of robelinis, accross drive way, which i watered with 2 tablespoon epsomsalt + 3 oz of manganese sulphate in same bucket 20 days ago, and it has some greener new comming leaves, but they still not dark green, light color.
So what kind defficiency my palms have?