Advanced Nutrients pH perfect range

My plants are in their third week of flowering and are showing signs of phosphorous deficiency so I have decided to buy a proper flowering fertiliser (up until now been using this seaweed stuff). I was looking at Advanced Nutrients pH perfect bloom and was wondering can I just use this or is it necessary to buy the micro and grow as well? Considering I am already flowering I really just want something for flowering nothing else so buying all 3 would seem a waste.

you will need micro aswell. micro/bloom or micro/grow

peace

Just get the bloom A&B and you be fine. I water like this - fill 1l water. Add XYml of A. Mix. Add XYml of B. mix. Give a minute or so. Water. Repeat

if youre buying sensi there is no grow, micro, bloom. thats an entirely diff base. the sensi is a 2 part nutrient...

i used them personally and commercially for years...until i discovered botanicare's line. its the only thing ive used in any of my crops in a looong time.

but i will say that it probably isnt anything to do with the seaweed stuff...because thats my basis and a lot of others. organic and veganic sources. a lot of us use those products and only those type of products. it sounds like there may be another problem at hand that youre not noticing.

are you using tap water? is it city tap or well tap water?
what are you adding as far as nutrients? anything and everything youre feeding them.
what is your PH? you could very well have a PH problem
...it could be any number of things. but i would highly doubt its the nutrients, unless youre growing hydro, and theyre huge...or the nutrients are out of date or expired.

Advanced Nutrients has an online calculator that says what to use in what amounts according to the age of the plant... go to http://www.advancednutrients.com/hydroponics/nutrient_calculator_old/ Usually they try to get you to use all kinds of suppliments... IMO- the bloom and Micro's are a must- the others- not so much.
You can also try ROOTS Organics-- it's a one part Bloom, but their 'catalyst" rocks! they are inexpensive AND available in smaller bottles as well- so if you do not use it all, you aren't stuck with a shitload sitting in the pantry!

The whole grow the only nutes I have used is the seaweed stuff nothing else. I have no way of checking/adjusting pH but I know the water in my area is around 6.4-6.7 so I don't think that should be an issue. I don't suppose using one of those brita water filter jugs would help as at the moment I am just using tap water? With buying nutes it is difficult because I am UK based and can only really buy whats available on amazon uk. That roots organic is expensive! Trying to keep this whole thing cheap currently cost me about £120 for everything inc seeds and I only have a 4/5 weeks left so I dont want to fork out an extra 30 quid. This is my only grow for a good while so it will be a waste to buy a load of stuff. If I were to just buy the bloom how would it work out, surely better than with what it has now?

ACLD said:

The whole grow the only nutes I have used is the seaweed stuff nothing else. I have no way of checking/adjusting pH but I know the water in my area is around 6.4-6.7 so I don't think that should be an issue. I don't suppose using one of those brita water filter jugs would help as at the moment I am just using tap water? With buying nutes it is difficult because I am UK based and can only really buy whats available on amazon uk. That roots organic is expensive! Trying to keep this whole thing cheap currently cost me about £120 for everything inc seeds and I only have a 4/5 weeks left so I dont want to fork out an extra 30 quid. This is my only grow for a good while so it will be a waste to buy a load of stuff. If I were to just buy the bloom how would it work out, surely better than with what it has now?

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get some jungle juice bloom if you want a cheap option it is ph perfect so it will keep your ph around 6.4 depending on the ppm of your water

and then get a cheap ph pen all of this for less than 20£