http://www.freepatentsonline.com/5492553.html"Calcium is an important nutrient which is called for in many plant nutrition formulations, but calcium salts cannot be used together with the conventional phosphorous sources-monoammonium phosphate and diammonium phosphate-as the pHs which these phosphate sources provide are too high (not acidic enough) to give adequate solubility to the calcium ions and thus give rise to precipitation of the calcium salts in the stock solution and in the proportioners.
Potassium phosphate or sodium phosphate can be used as soluble phosphorous sources but these are either expensive or not conducive to plant growth. Phosphoric acid can be used but is a liquid and hazardous to handle. Therefore, a grower wishing to fertilize with both calcium and phosphorous, without resorting to the use of an alkali metal phosphate or liquid phosphorous acid, will need to inject these two elements separately.
http://ip.com/pdf/patent/US5171349.pdf"Urea phosphate, by the effect it has on solution
pH, prevents the formation of calcium phosphate, mag-
nesium phosphate and iron phosphate, which are not
soluble. Similarly, the low pH helps prevent calcium
from precipitating in the presence of sulfate ions which
may be present. Therefore, when urea phosphate is used
as a primary phosphorous source, it will make possible
the inclusion of phosphorous and a metal such as cal-
cium, magnesium or iron in one compound fertilizer,
without the use of chelates or the disadvantage of a
precipitate forming. This allows the end user to prepare
and apply a complete nutrient solution using one stock
solution and utilizing one injector. It also makes possi-
ble the inclusion of nonchelated trace nutrients into
phosphorous-containing nutrient solutions without pre-
cipitation. It also allows the fertilizer solution to have
an increased acidifying effect on the growing medium if
needed. In summary, the advantages of using urea phos-
phate as a primary phosphate source in a solid com-
pound fertilizer are:
a. The ability to purchase, prepare and apply a complete
nutrient solution with one stock solution and one
proportioner.
b. The ability to use nonchelated micronutrient trace
elements without reduction in solubility in the stock
solution as is observed using conventional dry phos-
phorus sources.
c. The ability to formulate acidic fertilizers that are sold
as dry solids and thus are less hazardous to the end
user than liquid phosphoric acid-based materials."
State of Oregon ran their own tests on Advanced Nutrients products and found that what was actually in the bottles was not what was on the labels. I guess recently Advanced has been removing the informative labels out for generic labels that don't list what's in the product as well.
This company is shady! Ethics? Where?
http://www.integralhydro.com/AdvancedNutrients2.html
http://www.oregon.gov/ODA/PEST/stopsales.shtml
Because I don't know the story behind the other companies. I only know that Advanced has refused to cooperate with Oregon and California regarding the actual contents in their products. I don't know anything about the others. Apparently they go on that list until the company gives up the information. So being on that list doesn't mean they're a bad company, but being on that list, being caught mislabeling your products, and publicly stating you will not tell what's in your product, is pretty shady.
I think it's because certain ingredients aren't supposed to be sold in certain states so they just dont list them... not really being shady...
Because I don't know the story behind the other companies. I only know that Advanced has refused to cooperate with Oregon and California regarding the actual contents in their products. I don't know anything about the others. Apparently they go on that list until the company gives up the information. So being on that list doesn't mean they're a bad company, but being on that list, being caught mislabeling your products, and publicly stating you will not tell what's in your product, is pretty shady.
If I stumble upon a breakdown of another nutrient companies products I will post that too, jesus. AN Fanboy much?
http://www.youtube.com/watch?v=JnpONATTYhM