But if you really must you could try,
1 cup miracle grow, 3-2-6
1/8 cup Sulphate of Potash, 0-0-6
2/3 cup Sulphate of Ammonia, 14-0-0
1 cup Bone meal, 4-10-0
total 21-12-12
But your PH will probaly be way out and you will need to test,
I DONT RECOMEND IT THOUGH!