Hi. i may be able to help.If you have salt build up or nutrient lock out . First off flush use drip clean with r.o/ or I believe
hygrozyme works well too( .flush with r.o 5.9-6.2 pH flush for 1-2 days. note..
Hygrozyme is a natural enzymatic formula used for cleaning growing mediums, without chemicals. Enzymes in a growing media eat dead protein removing potential areas where illness can develop. Through this break-down process plants are better able to obtain nutrients. More nutrients and less attacks equals bigger, stronger and faster plant growth. Use during all growing stages. and and start your feeding again but this time don't over do it on the nutrients .
A. If your leaves are yellowing and dying at week 6 1/2 there's a lot of variables.
Nutrient burn can be seen different ways . Are the white pistols tips burnt .are the leaf tips burnt.How close are your hoods ?. Do the fan leaves curl up.. do they twist look at the freshest leafs for signs. If completely yellowing and inside nug is yellowing you should watch for bud rot
Calcium and magnesium prevent that. I use
general organics cal/mag 3.8_4ml gal
. Do you have a ppm pen around week 6. The ppm should be between 650-850ppm
nitrogen 5-7/ pk 16/19
Cal/mag 7-9℅
Less is always better then more. You can always up it but coming back is a bitch.so learn to look at your ppms and learn what weeks of growth need what this will help you not to over do it.
These ranges are my suggestion for you so u don't ruin your plants
pH 6.0-6.3 week 6 nug structure is building. I would cut you nutrients down 25-35℅ don't start off full strength because same thing will happen next week
If your feeding 4ml a gal
Feed2-3ml and that goes more for the p/k .week 7 bump it up to 3ml-4ml 75-80℅ full strength.
calcium and magnesium is a must from week 3 to week7/8 roughly speaking.kinda depends on flower length .
if you don't see and tip burns your good.if a small tip burn is OK I mean small .it lets you know if your nutrients are a little hot but the plant can handle it..just taper it down a little on the nutrients..you'll be fine