The newer upgrade formula of On Schedule (offered 03.15.2016) can be used as both leaf feed and root feed. I would suggest that you use them both. The leaf feed at 10-15 ml’s per quart and the root feed at 1/16 to 1/8 ml per gallon of root feed. Beta test at ¼ ml per gallon for optimum flower set and development but as usual, keep a close on flower development to make sure you aren’t over doing it for the strain you’re growing.
If you have decided that there is little chance for powdery mildew from spraying on your leaves use the leaf method. Start 10 days before you place your plants into the 12/12 light cycle, spray once a day. Once you are in the 12/12 cycle continue for 4 more days. After that you can add the root feed at the lower strength. Increase the strength if you feel the plant can handle the higher dose. Discontinue the On Schedule two weeks from harvest.
If you are not going to leaf feed you can start the root feed 10 days before you place your plants into the 12/12 light cycle. Use a dosage of 1/16 to 1/8 ml per gallon of feed. Increase the strength if you feel the plant can handle the higher dose. Discontinue the On Schedule two weeks from harvest.