Problem Need Help ! Pictures Included

Hi.
I am now in 4 - 5 weeks into flowering for this nice Super Skunk girl but since a few days I noticed that the leaves are curled down with a crispy feeling (dry) when touched, my leaves stems are
dark purple and my bottom fan leaves are getting yellow... The plants seems to have slow down its buds development and I am sure I am doing something wrong.
This is my first grow, in soil, temperature is maintained around 70 - 75, she is under a 600 watts HPS at 12/12 and I recently added some bat guano to the soil and yesterday I received a bottle of X factor
that I started to use as directed (so it can't be the cause of the problem)... Please help me...
Here are the pics :

It looks like she needs nutes. Here is N def:

"Nitrogen DeficienciesPlants will exhibit lack of vigor, slow growth and will be weak and stunted. Quality and yield will be significantly reduced. Older leaves become yellow (chlorotic) from lack of chlorophyll. Deficient plants will exhibit uniform light green to yellow on older leaves, these leaves may die and drop. Leaf margins will not curled up noticeably. Chlorosis will eventually spread throughout the plant. Stems, petioles and lower leaf surfaces may turn purple."


So you have added bat guano (10-5-1), how long ago? What is the ph of the water you are giving her? Any other nutes? You could just need to feed her some bloom formula asap or you have nute lockout. I'm guessing you just need to feed her. xfactor is not a fert, just another overpriced AN product that no one can decide if it really works.

i was gonna say n def. just like that guy. ^^^^^^^^^^^ he just summed it up. hook them up with a little grow with ur flower nutes. some plants will need a little bit during the first 5 or 6 weeks of flower. but dont add a ton. and some yellowing and stuff on the fan leaves is natural during the end of flowering so be careful how much grow u actually do give it.

4 to 5 weeks into flower they will stop stretching and plumping up.ive seen worse.

ph is 7.5 - 8.00 how do i lower that ?

actually while there could be a nitrogen deficiency... you dont want to feed too much nitrogen into your flowering period as in the soil should have had it in a couple of weeks ago's feeding to where it should carry it out till week 4 of flowering then small amounts of N through on out the rest of the grow till a couple of weeks left then no nitrogen...

the curling and clawing and or droopin of leaves could be a combo of too much nitrogen in the soil and probably caused by over watering...

those brown and rust spots on first pic are due to a too acidic or alkaline and or hot soil... so you might want to check out your soil's pH before adding any more nutes to it... keep it as close to 6.5 as possible and should be fine...

im gonna take a guess and say you are in some sort of extended release pre-fertilised soil ... then again this is just a guess... need more info for accurate diagnosis...

the last 2 pics look like overall the plant is on its way to giving you some good buds... but hard to tell what may be wrong with the plant as a whole due to the reds emitted from the hps that were picked up by your camera...

good luck and enjoy the grow...

U can get ph down or use acid phosphoric for control your ph and use ph meter ....

This seems perfectly normal at this stage of the plants life cycle. Plants tend to "stretch" during the early stages of the flowering period in order to produce the maximum number of budding sites. During this growth spurt, your plants will use up much of their Nitrogen reserves. As the plants focus on flower production they begin to steal Nitrogen from their leaves, thus the yellowing. Also, the plants will shed their bottom (low-light) fan leaves in order to conserve much needed energy. If I'm growing a long flowering sativa strain, I will continue feeding nitrogen until about the third week of flower to prevent premature yellowing of the leaves.

That's bad ph up ph down you buy them at the grow store or Dolomite Lime has been a useful PH stabilizer for years, since it has a neutral PH of 7 when added to your soil it stabilizes your soil at PH 7.

You need to do this slowly over a few days The best way to stable PH is by adding 1 ounce of Dolomite Lime per 1 gallon of potting soil.Dolomite Lime is available in garden nurseries. Buy the fine Dolomite powder (There may be several kinds of Dolomite like Rough, Medium, Fine)
If your soil needs to be more acidic, sawdust, composted leaves, wood chips, cottonseed meal, and especially peat moss, will lower the soil pH.

was your ph test from the run off? It can make a difference.

baking soda is a base and vinegar is an acid if that helps

If you have a mortar and pestle you can grind up the lime better if that's all that is available