it will depend alot on the percentage of nutes in your fertilizer. Some organic ferts are 2-1-1 and so can be fed at full strength without much worry of overfeeding, where some read 24-20-20 (and even much higher) and should be given at less than the recommended dose. It can be a tough thing to figure out but the general rule is that "less is more." In my first batch I fed early on at 75% the recomm. and the nutes were 24-5-10. Turns out that was overfeeding a few weeks into veg. I flushed and waited several weeks before feeding again and then they showed signs of nitrogen deficiency. Whatever nutes you are using be patient, go slowly and pay attention to what your doing so that you'll have a starting point if changes are needed. How much and how often to feed I've found for me to be the most difficult aspect of growing.