first off MJ shares a need for the same nutes as corn. look corn up. secondly, dont over-think this whole growin' thing. MJ is a weed & will grow despite some of our best intentions. the main reason for failure in a grow is to "over-love" your plants. during the veg cycle MJ needs more nitrogen than anything else, human urine has the highest nitrogen content there is, dilute it like 50ml urine to 1l water. make sure water has sat out 24hrs if using tap water. chlorine will burn young roots & will kill off good bacteria. if you can find blood & bone meal they are great for mixing with potting soil. the bird crap you can put in an old pantyhose & use it like a tea bag with your water. use this water every other time, if you get a very slight tip burn on leaves this is good, anymore than a few cm though & you will need to flush with plain water until it drains clear out the bottom of container. there are all kinds of things you can use, do a google for more info,..good luck over there. keep your head high & your pot low! r