Question: asking about the banana plantation spacing, pit size , fertiliser dose 
Answer: suggestion=
banana spacing-  1.8m* 1.8m
pit size - 45cm*45cm*45cm
fertiliser dose- urea- 210gm
                                  super - 200gm
                                  potash-550gm
method of application= urea and potash should be apply in 2  equal splits dose, one dose  after 3 month of planting and another dose at 5th month of planting.
super should be apply before the planting of banana, should be mixed with fym.
proper irrigation should be done regularly.
banana plantation / bigha required 410 t0 420 plants .