how much and what mix of food to use

hi. i am having problems with the food. when i feed i notice some yellowing the next day . i know this is prob due to over feeding. but i dont really think i am giving too much

so here goes

under a 600 watt hps thirty plants in 4 litre pots

i am using

rhizotonic biogrow supergrow all mixed together at around half the reccommended dose.

is it ok to use all these three together in one feed. or is it too much. the ph of feed is 5.5

the water is hard water. cant help this. i think its very hard actually.

also what volume of feed should i use.

they are in the big 4 litre pots and are about 5 weeks old about 7 inches tall and quite leafy

please help i am worried about the yellowing. i have actually broken off the very bad leaves as they will never recover is this ok to do.

when you mix multiple nutrients you are supposed to put less.i would flush for a little bit.some plants are sensitive to nutrients.and let the yellow leave fall of by them selfs.when the plants start buding some leafs turn yellow and die of.

CR500ROOST said:

when you mix multiple nutrients you are supposed to put less.i would flush for a little bit.some plants are sensitive to nutrients.and let the yellow leave fall of by them selfs.when the plants start buding some leafs turn yellow and die of.

Click to expand...

If his leaves are turning yellow its not because of too much food. Instead there would be burn on the leaf tips. Sometimes yellow leaves can be a nitrogen deficiency problem. If you are vegging, try and feed your plants a food rich in nitrogen.I use blood meal If you are in flower don't worry about the yellowing leaves, thats good. its normal. Means the plants is about to finish its life cycle. If thats the case feed less N and more P-K

ph for soil nutes should be around 6.5 and for hydro nutes 5.8... i think you need some dolomite lime(assuming your in soil)