Doug, Keith et al. No I am not really satisfied with the answer. Here is why. ~ I had the same ans from County agent. In some 10 F'n weeks of rain, I did a little "Playing" with some Jals. I set up 6ea 3 gal pots. (no more room in GH) 2 plants I feed full strength MG ~ 1 tbsp per gal. 2 Plants 1 tsp per gal of MG 2 Plants MG's seed start 4-12-4. If the reduction was somewhere near, the 1 tsp per gal should have been close to 5-12-5. ~ correct. And 4-12-4, should not be enough difference that without fancy equipment I should not be able to tell the difference. This very limited in scope, I'll admit. All plants were feed every 1 pint every 2 weeks. After 10 weeks, Both the 1 tsp and 1 tbsp of 15-35-15 look the same. That is leaf to leaf spacing, and plant height, number of blossoms and loaded with aphids. The 4-12-4 plants are a little smaller, the leaf to leaf spacing is less, No aphids, 4x as many blossoms started. Thicker stems. Something doesn't add up. What ?? Byron