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Sick Plant Plants top leaves turning yellow help


Austin15
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Eucalipto
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  1. Hi there I have plants in soil they have been in flower for 2 weeks the top leaves are turning yellow and some burning around the edges I feed once every 3-4 waterings 

I put in ph 6.2 and 1.2 ec

Runoff of soil is reading 5.5 ph and 1.0 ec

of the first plant tested so far

Second plant is 5.4 ph ec is 2.1

Can anyone help

 

20210719 202804
20210719 202808
20210719 202756
Grow Medium
Soil
Grow Light
Led 800watt
Temperature C/F : (Light on/off)
25 /20
Humidity
60
Picture of Problem
20210719_202808.jpg
Nutrients

Goliath plant nutrient

pH Level
6.2 input
EC / PPM / TDS of Feed

1.2 ec input

Feed Frequency
Once per week
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Zombie Nation
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OG
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(@zn)
Valencene
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Tips burnt is too much on the nutrient side and 6.2 is the wrong Ph for soil...you want to be between 6.5 & 7.2 ideally, this is causing a N lockout...flush Ph'd water @6.5 with 3 x volume of pot minimum, then feed 1/4-1/2 strength on next one.

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Austin15
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Eucalipto
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@zn hey man thanks heaps thought as much just don't know what info u can trust I thought the info I'd gathered was from a pretty trustworthy source

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Mr_Kryton
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Linalool
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@zn Hey ZN, is the 6.5-7.2ph water standard for like any soil pretty much?
I have also been PHing my water down to ~6.2. I'm right there with @Austin15 with the Interweb info 😉

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Zombie Nation
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OG
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Valencene
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@mr_kryton Yes mate...6.5 to 7.0 is the usual...can depend a lot on soil too as some soils have dolomite lime to help regulate...canna likes slightly acidic soil so 6.5 is a good call, 6.2 is not massively bad as coco likes the lower end of the scale but soil is a funny substrate

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Mr_Kryton
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Linalool
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Awesome, thanks.

Right now I'm in a 50/50 mix of Foxfarm Ocean Forest and Happy Frog. 

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Mix
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 Mix
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Linalool
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Unless your water or food/medium is effecting the ph you really don’t  need to ph soil.

As said if the medium mix is acidic add some Dolomite lime. 
6.5 is what you should aim for in soil 

different nutes get taken up at different ph levels and or lock others out honestly Kiss and ditch the ph up/down in soil Lime will buffer 

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Austin15
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Eucalipto
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@mix thanks for your advice man really appreciate have flushed them with 60L of 6.5 water as advised shall see how they go might try .6 ec for first feed after flush possibly

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