Necrotic spots, paling leafs. Watering with ph7.5 water, and runoff at <5.

M

mjuff

Member
So basically this is the deal.
Im growing a Afghan skunk feminized seed. Im in week ~4.
Buds are forming. Lower fan-leafs are getting yellow and dying. This is normal as i understand it.

But now some higher up leafs are getting necrotic spots.

Im watering with common tap-water. I have been using both organic and chemical fertilizer.

The pure tap-water (that i use every 2 or three waterings, without any fertilizer) has a pH of around 7.5.

The runoff water is at about 5.5 i think.

Any idea on what could be the problem?
 
check the ph of the water after u put the chemical fetilizer in it, and i bet it drops to about 5.0 or so.
Organic and chemical fertilizers dont really work together to well as organic ferts feed the bacteria in your soil which then produce nutes the plant eats. while chemical nutes just make the nutes availalbe to the plant but have the sideeffect of killing off the bacteria in the soil.
Id either stick to organic nutes, or get some ph perfect chemical nutes like sensi a&b to use.
ph lockout can definatly cause the problems your experiencing.
FLushing with a large amount of that high ph tap water will likely remedy the problem for you. soil ph needs to be about 6.5
 
herbbilly said:
Pics,temps blah blah blah randpm
Click to expand...

Cant get pics now sorry. I know that makes it harder.

Temp: ~27C degree, down to around 24C at dark.

Soil: A mix of Gold label peat based soil and a swedish brand that has been recommended in growing circles together with some vermiculate and permalite.

The pH of the main soil (the swedish brand) is 5.8.

Adjorr said:
check the ph of the water after u put the chemical fetilizer in it, and i bet it drops to about 5.0 or so.
Organic and chemical fertilizers dont really work together to well as organic ferts feed the bacteria in your soil which then produce nutes the plant eats. while chemical nutes just make the nutes availalbe to the plant but have the sideeffect of killing off the bacteria in the soil.
Id either stick to organic nutes, or get some ph perfect chemical nutes like sensi a&b to use.
ph lockout can definatly cause the problems your experiencing.
FLushing with a large amount of that high ph tap water will likely remedy the problem for you. soil ph needs to be about 6.5
Click to expand...

Will try flushing it good once.
Should i just use my gold-label chem fertilizer afterwards then?

With both fertilizers combined the pH goes down significantly.

But with only the chem fert. it stays about the same. (7.4 +)
 
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