I need help my plants are sick

hello i got cheese from dinafem and my plants are yellowing from the bottom of the pots they are 4 weeks old i switch them to flowering week ago.My soil is canna terra pro.I give them in veg only bio canna rizothronic and before change the light to 12/12 i put bio canna flores half strength .The bad symptoms starts when they go to flower. i wanted to water them now but in this case i will wait for your reply and advices.I think of Mg def Nitrogen or potassium, PH is around 5,5-6,5, temp is 31 celcius but the ventilation is good but its summer, i water them 2-3 times per week always check PH and EC when i watered with nutes last time E.C was 1.1.They are from week in flowering and only 1 plant show the hairs.sorry for my english thanks all cheers

purplehaze211 said:

hello i got cheese from dinafem and my plants are yellowing from the bottom of the pots they are 4 weeks old i switch them to flowering week ago.My soil is canna terra pro.I give them in veg only bio canna rizothronic and before change the light to 12/12 i put bio canna flores half strength .The bad symptoms starts when they go to flower. i wanted to water them now but in this case i will wait for your reply and advices.I think of Mg def Nitrogen or potassium, PH is around 5,5-6,5, temp is 31 celcius but the ventilation is good but its summer, i water them 2-3 times per week always check PH and EC when i watered with nutes last time E.C was 1.1.They are from week in flowering and only 1 plant show the hairs.sorry for my english thanks all cheers

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There fine mate its normal for lower foilage to die off and go yellow when they cant photosynthesis cause they r blocked by higher foilage and get no light they die do not worry

Cal mag!!!and a little more nitrogen. ..

Thanks guys for answers.Can I to feed foliar magnesium oxide? I have something like this from Bio Nova mono fert
Mg 8% its magnesium oxide on the bottle they write this:
A dosage of 1:1000 increases the total amount of Mg by 2 mmol.
DOSAGE:

In case of deficiencies add 25-100 ml. per 100 litres of nutrient solution.
Note that when you are already using one of BIO NOVA’s main fertilizers a supplement of magnesium is not necessary.

What dosage shoud i add to foliar feeding is it safe? .I have couple of hours to switch off the light so I'll be grateful for the quick reply.

so if i'm reading correctly, you gave them 18 hrs light for 3 weeks (your vegetative stage) then threw them into 12/12 at the start of week 4? If that's the case i'll have to disagree with weedenhanced, there shouldn't be that kind of yellowing; also, the intervenal chlorosis with the green veins is usually a sign of a deficiency BUT that does not necessarily mean the answer is to add what's deficient ( in this case, I agree with Mr. Moonshine, you look like you're having a cal-mag issue).
How frequently are you watering / what is the soil condition when you water (is it damp etc.)?
What's your water analysis (how much calcium, magnesium etc. is in it from the tap, what's the pH)?
I'm not sure about your soil, and i know even less about your Bio Nova Mono Fert, but if you can get your hands on some magnesium sulfate (epsom salts) then 1-2 tablespoons per gallon of water, fed as a foliar spray, will help correct a magnesium deficiency.

Now, briefly, the questions above are to help you address some things that could be causing your plant to have trouble absorbing magnesium: water stress (over or under watering) is one of the most common issues people run into, and it gets misdiagnosed all the time. it is also possible that there is plenty of magnesium in the soil, but the ratio of calcium to magnesium is too high, which locks out the magnesium. Thus, foliar feeding the magnesium allows the plant to be "force fed" what it needs via the phyllosphere. There is also the issue of pH lockout. I don't have my chart in front of me, but 5.5 is on the low side for soil, and if your range of 5.5-6.5 indicates that your measuring a swing that big, then pH would seem also to be an issue for you, as pH swings and low pH can both cause lockouts and stress.

Hope all this helps, sorry for failing to convert units back to metric
be easy,
Dr.J20

Im watering them 2-3 times per week,when the soil is very dry and i give them more water, around 2 litres its half of a gallon on 3 gallons pots.Water that i used is mineral water from market(store) EC of that water is 0,4.Right now i dont have epsom salt so can i give them that foliar feed with this magnesium or use full flower fert Canna bio flower with all the elements ,i will buy epsom salt tomorrow?And i will rise PH not adding vinegar and water them with 7.5 PH this will be good ?What about Nitrogen def?I get you man that water from store have not enough magnesium in it and 3 times more calcium so I'll be watering them with tap water its better for now.

so before I turn out the lights for plants, I sprayed them with plenty of calcium and magnesium mineral water bought in the store, EC was close to 2.0 of this water but I mixed it with tap water and finally EC was 0.8 so I'll sprinkle them that water every 2-3 days what you think?. Tomorrow will be my watering because the lower leaves starting drop and i dont know what to give them to the water for that deficiencies but I know to rise PH to 7.5,any advice welcome.From fertalizers i have Bio Canna Flores.I have a fertilizer with faecal worms Californian improves soil microflora is rich mainly nitrogen and trace amounts of potassium and phosphorus 100% organic but rather it is used at the stage of growth but I've changed to the flowering period already i dont know if it does not hurt or delay the flowering process.