Since Im on a very tight budget can I only use compost instead of many bottled nutrients?

You can use, used coffee, blended up banana peels and bone meal (you can make your own or you can use fish bone and blend them into smaller pieces). All below amounts (left side) are per gallon of medium. If you offset the seaweed and just use more banana, you should be able to grow for free.

Substrate for vegging

Amendments

N

P

K

Coffee (68g)

1.43

0.2

0.2

Bonemeal (3.5g)

0.16

0.57

0

Banana (34.4g)

0.03

0.03

0.8

Seaweed (1 TBSP = 7.3g)

0.15

0.02

0.22

Total NPK

1.78

0.83

1.21


Top dress for vegging (added monthly)


Amendments

N

P

K

Coffee (52g)

1.09

0.16

0.16

Bonemeal (1.4g)

0.06

0.23

0

Banana (28g)*

0.03

0.03

0.64

Total NPK

1.18

0.42

0.8

Substrate mix for flowering


Amendments

N

P

K

Bonemeal (20g)

0.9

3.26

0

Banana (85g)

0.26

0.26

1.96

Seaweed (2TBSP = 14.6g)

0.3

0.04

0.44

Total NPK

1.43

3.56

2.4

Top dress flower (applied once at the start of flowering only)


Amenments

N

P

K

Banana (52.5g)*

0.06

0.06

1.22

Bonemeal (10.8g)

0.43

1.76

0.02

Coffee (5.2g)

0.11

0.02

0.02

Total NPK

0.6

1.82

1.24

I hope that helps.
 
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