I just keep Bananas for a year or so................
I keep it in my garden..........here in my house..............
It´s in the middle of São Paulo city.....................so its not virgin soil...........
The soil is very bad..........
In this year I start to improve it..............with organic material.........and bone meal............
I had a Ca def with one species....................due the presence of "umbrela hook" cigar leaf.................
That´s why I´m studing chemical fertilizers.............
I understand the concep of NPK..................but I don´t know how to use it...........and what´s the best formulas to use..................
I´m affraid of over fertilize....................due the lack of my knowledge........
I was Reading this article..............and I founded that KNO3 is benefical to bananas.............
Revista Brasileira de Fruticultura - Efect of dolomiotic limestone and potassium nitrate in the initial development of seedlings of 'Prata-Anã' (AAB) banana tree from in vitro culture
But its a bit advanced to me..............