help please my OB is yellow!

[badassskunk]

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hi all, hoping i can get some advice on my plant here. Since flowering it has been steadily yellowing, until now (5 weeks in), its only the smaller leaves that are true green. I have done a bit of research and reading on the site and this isnt my first grow but ive never really had problems till now. I know leaves yellow toward the end of flowering but this seems to have started way too early.

Im using biobizz allmix and have been giving bloom fert every watering (every 2 days approx) (5ml per litre). Other than that ive added a little bat guano as a top dressing when i first noticed yellowing but only once.

I have now not watered her for 5 days as i first believed this could be 'lock-out' due to overwatering, and given that its taken that long to dry out it may have been part of the problem. This lead me to test ph of my water. I have tested my water here straight from the tap and its ph8? (could this be the time of year with extra leaves decomposing into the groundwater etc?), ive tested it after leaving it for 24hrs and it was even higher !?

Ive tried testing my water after adding the fert and it definately lowers it, cant be sure of dilution but around ph7.

I have no method to test the soil ph yet but plan to get one along with ph up and down.

So now im not sure what to do for the best as i dont want to leach the soil with a high ph water so should i leach with a diluted fert such as Al-ga-mic? or just wait and lower some water then leach?

or am i wrong altogether

any help most appreciated

[badassskunk]

ummmm.

will check back later then

[smokingaces]

maybe you can get your answer from here.
http://www.marijuana-seeds.net/Thanks-ThankYou.htm
regardless if you can find the exact reason, i believe it is nutrient related. if you cant figure it out try flushing the roots and then using nothing but water for a week. see if you find results.