Depending on your strain, whether they are light or heavy feeder, you may have to use more or less. As far as my strain goes, from clone, at transplant I start with a weak solution of Bloom Booster to stimulate root growth @ 0.6 EC which is right around 400-450 ppm on the .7 conversion. From seedling, I start feeding the minute it get it's first set of serrated leaves @ 0.3 EC which is around 200-250 ppm on the .7 conversion. After 2 weeks, I bump it up to 1.0 EC throughout veg while alternating between All Purpose and Bloom Booster (gotta keep them roots growing). Keep in mind, the results you see on top is a direct result of how well you build the root system below. Anyway, I don't follow a "1 tsp per gal", "2 ml per liter", etc rule. Regardless how much water I use, I will add Jacks until I reach 1.0 EC. During flowering, I bump the levels up to 1.3 EC. The first 2 weeks of flowering, I do 50/50 of All Purpose & Bloom Booster. Week 3 - harvest, I only use Bloom Booster and a little All Purpose here and there when needed. I feed every watering and don't ever flush because so little fertilizer are used, smoke great. Because Pro-Mix is soiless (passive hydro), I adjust the pH to anywhere between 6.0 - 6.3. Sorry if it sounds a bit confusing but here's how it looks like:
Week 1
Clone - 0.6 EC BB
Seedling - 0.3 EC BB
Week 2
Clone - 0.6 EC AP
Seedling - 0.3 EC AP
Week 3 (alternate between ferts) - 1.0 EC BB/AP
Week 4 - 1.0 EC BB/AP
Week 5 - 1.0 EC BB/AP
Week 6 - 1.0 EC BB/AP
Flower
Week 1 - 1.3 EC 50/50 BB and AP
Week 2 - 1.3 EC 50/50 BB and AP
Week 3 - 1.3 EC BB
Week 4 - 1.3 EC BB
Week 5 - 1.3 EC BB
Week 6 - 1.3 EC BB
Week 7 - 1.3 EC BB then harvest
If I grow strain longer than 50 days flowering time, I just continue the 1.3 EC feeding.
Hope this make sense and help you out somewhat. Again, you can use this schedule and tune it to what works best for your strain. This works out perfectly for mine own cross (Hindu Skunk x SFV OG) x Pineapple Express. OG Kush on its own are usually hella heavy ass feeders especially the SFV cut. Here's how my plant is currently looking. It's swelling up nicely. Fucking chunky "hardball" buds everywhere. Under a 600 watt cheapo $15 HPS bulbs, I'm looking at 14-16 oz dry weight per plant. Plants suffered in earlier stages and yield this run looks pretty low compared to past 5-6 runs of this strain. 2 more weeks till chop. Good luck.
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