I recently purchase a bag of fertilizer from the very well known J.R. Peters, Inc. (Jack's Water-Soluble Fertilizer). I found this recommendation printed on the front of the bag. These are general fertilizing rates, given in ppm.

................................Constant Feeding......Periodic (Every 7-10 days)
Plug Trays/Salt Sensitive.50-125 ppm.....................175-225 ppm
Woody Ornamentals........50-100............................200-375
Bedding Plants...............100-150...........................200-250
General Foliage..............100-200...........................250-300
Cut Flowers....................175-225...........................300-450
Garden/Landscape..........200-300...........................400-750
Heavy Feeders (Citrus)....200-300...........................350-400
Light Feeders (Orchids).... 75-150............................200-250

Millet (519-)

Thank you Millet!
Good to know, I'm using every 10-14 days 250-280 ppm of N.
So, I can give them a higher ppm of N from next year.

Millet, when you mix Jack's Water-Soluble Fertilizer with water, what effect dose it have on neutral water PH at the heavy feeder PPM(300-400)?

Karoly, the PPM levels are of not just N but N-P-K, so your N level is actually a little high in relation to the chart above.

Ryan's question: .....when you mix Jack's Water-Soluble Fertilizer with water, what effect dose it have on neutral water PH at the heavy feeder PPM(300-400)?".........

"Ryan, the answer to your question depends on what formula of fertilizer you dissolve. Every fertilizer formula would have a different effect. Some formulas would raise the pH, some formulas would lower the pH, some would not make much difference with the pH. Besides the fertilizer added, a good bit of the effect on pH would also be from the buffering effect of the type of medium, and the alkalinity of the irrigation water. These are, of course, general fertilizer recommendations, as to what the recommended amount of fertilizer to apply, depending on the type of plant one is fertilizing. - Millet (518-)

Let me try and be more specific, If I mix Jack's Water-Soluble Fertilizer 25-5-15 with PH neutral water at a rate of 400ppm what would I expect the PH to be?(lowered, no change or increased) I am asking because I believe you use this fertilizer?

25-5-15 has a potential acidity of 608 lbs. Calcium carbonate equivalent per ton. Therefore it is an acidic fertilizer that would produce H+ ions. 25-5-15's is a acidic fertilizer, but not as great a potential of many other types of fertilizers, 30-10-10 for example is about twice as acidic, thus has the potential of lowering the pH of a medium twice as fast. But once again, when using 25-5-15 it could lower the pH of the medium, it could have not much of any effect on the pH of the medium, or the pH of a medium could even continue to slowly rise, depending on the various buffering effects that are present, including the alkalinity of the water supply. Ryan, to answer your question, in pH nutral water, and a low buffering media, 25-5-15 would, of course, with its acidic potential of 608 lower the pH. - Millet (518-)

Thank you RyanL!
I learn something again!

Ryan, no I believe, as is always the case when referring to ppm, that J.R. Peters is referring directly to ppm N, and not to ppm for the complete formula. Therefore, the high rate would be 350 to 400 ppm N. Below is the instructions that are printed on the bag with the suggested feedings that are listed in the post above.

J.R. Peters instructions printed on the bag............."

SUGGESTED FEEDING CONCENTRATIONS PPM NITROGEN
Jack's Professional recommends these feed rates for the following crops. Remember to also consider plant stage, pot size, leaching faction and environmental conditions when applying suggested rates. The quality of your water source will also affect overall feed rates, frequency and other additions in order to achieve optimum growth.

NOTE: I took the liberty to write the word (Citrus) after the Heavy Feeder rates, as citrus are indeed heavy feeders.

Concerning CCPP, when Citrus Joe and I were given a private tour of the facility by Dr. Kruger, they were feeding their container trees at 300 ppm N with every watering. Every citrus tree that the CCPP has are container trees, the CCPP does not have any in ground trees. Whether they used dry fertilizer a couple times a year or not I cannot say.
Millet (518-)

Ryan, yes. Read the heading on their instructions. I believe, that that information is printed on every formulas bag regardless.- Millet (518-)

OK, now I'm really confused!
Millet, so the ppm is refering to N, I'm right?
RyanL, I think you spoken about TDS, yes?

Karoly, you have been correct. According to Jacks, you could increase the baseline PPM of N to 300-400 on the 7-10 day schedule. PPM (part per million) and TDS(total dissolved solids) generally the same thing, Sorry for the confusion

Millet, just to clarify, Jacks fertilizer recommends a nitrogen base line which is displayed in PPM like you show above. On top of this baseline, do they follow up with the recommended jacks fertilizer applications for the different plant classes?

I used this to calculate my ppm(very nice tool!):
http://www.firstrays.com/fertcalc.htm
I hope the ppm provided by Millet are for N only because I got this after calculating:

N:401 P:48 K:182
TDS: 631ppm