An actual email from the the CEO of DynaGro, with a bit of history
well it's a long story, but to shorten it I'll tell ya it started a long time ago when farmers figured out that they needed to add more P because it was leeched in soil (outdoors) then came the fad of container gardening in the 50's and the fert companies bottled the same ferts the farmers were usin for the folks growin in pots. The leeching thing was about depth of soil which of course is absent on containers. then there is this email from the CEO of DynaGro being honest go figure.
You are correct. We market a high P (Liquid Bloom) as some "believe" they need this. As you have noted, our Foliage-Pro does a great job start to finish. However, it is simpler to give the market what they think they need than to try to reeducate it. There is some evidence to believe that low N helps to convince a plant to stop its vegetative growth and move into its reproductive phase (flowering), but environmental factors are probably more important. P is typically 5th or 6th in order of importance of the six macronutrients. There is little scientific justification for higher P formulas, but marketing does come into play for the vast majority of users who lack any real understanding of plant nutritional requirements. Therefore, the market is flooded with a plethora of snake oil products that provide little benefit and can actually do harm. For example, one exhibitor at a hydroponic trade show had a calcium supplement with 2% calcium derived from calcium chloride. Can you guess what continued application of 2% chloride would do to plants?'\
I hope this answers your question and am sorry for Zina's inaccurate response.
Cordially,
Dave Neal, CEO
Dyna-Gro Nutrition Solutions
2775 Giant Rd.
Richmond, CA 94806
800-Dyna-Gro, Fax: 510-233-0198
grodave@aol.com
www.dyna-gro.com