Nitrogen Burn? Help

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LemmyGo

Member
Hello, it's my first grow. I am at day 28, at day 26 i saw two of older fan leaves tips getting crispy and discoloration. So i fed with seaweed extract, fish fertilizer and calmag solution at 500 ppm 6.5 ph.
Run off was 1000 ppm and 8 ph (i know not optimal but the plant was doing very good so far)
And it got worse but plant still looking good upwards. I am planning to give plain water next two watering.
 

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DCcan

DCcan

Well-Known Member
LemmyGo said:
Hello, it's my first grow. I am at day 28, at day 26 i saw two of older fan leaves tips getting crispy and discoloration. So i fed with seaweed extract, fish fertilizer and calmag solution at 500 ppm 6.5 ph.
Run off was 1000 ppm and 8 ph (i know not optimal but the plant was doing very good so far)
And it got worse but plant still looking good upwards. I am planning to give plain water next two watering.
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People will need info on what soil/medium you are growing in, what you have been feeding it, temps, humidity, etc.
Reference chart, look at excess primary nutrients in column on the left.

DEFICINCY CHART.jpg
 
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LemmyGo

Member
The soil(with perlite) is cheapest from grocery store. My temp is 20-22C and humidity is 45-50. My nutrients are homemade fish amino acid and homemade cal-mag. Dont know the npk ratios, my plan was to go with ppm and plant's reaction. 120w 6500k household led bulbs.
 
GreenGenez421

GreenGenez421

Well-Known Member
Over fertized and pH lockout. I'd also suspect the ambient RH is a bit low for such a young plant. Knowing your soil composition would help some but, you've got clear symptoms of pH that antagonized the problem. Run some plain water through the soil, that will help to remove some of the accumulated elements. Also forget about testing for ppm with anything organic. With any nutrient, less is more. Err on the side of caution and go light. The plant will show you when she needs more. It's very easy to UP any given feeding strength, but once it's in the soil.... we'll, that's a bit more work to get it out.
Fish amino or even brewers yeast packs one hell of a punch, use that shit very sparingly.
 
GreenGenez421

GreenGenez421

Well-Known Member
Get into a routine of feed, water, water, feed. When the soil drys back from the plant taking up the water/elements, it doesn't take all the elements and by such, your EC will rise as will pH. So just give plain water, this helps to ensure a healthy pH fluctuation, also the plant remains/has a higher EC than the soil, thus allowing a continuous uptake of elements.

On the other hand, if your soil has a higher EC than the plant does internally, this has the opposite effect and robs/hinders the plant from uptaking needed elements. This is what drives up your pH....
 
L

LemmyGo

Member
GreenGenez421 said:
Get into a routine of feed, water, water, feed. When the soil drys back from the plant taking up the water/elements, it doesn't take all the elements and by such, your EC will rise as will pH. So just give plain water, this helps to ensure a healthy pH fluctuation, also the plant remains/has a higher EC than the soil, thus allowing a continuous uptake of elements.

On the other hand, if your soil has a higher EC than the plant does internally, this has the opposite effect and robs/hinders the plant from uptaking needed elements. This is what drives up your pH....
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Thanks. I think my diy fertilizer much stronger than my guess. Should i flush right now or wait a day? soil is semi-dry
Also this an autoflower i hope it does not stunt.
 
GreenGenez421

GreenGenez421

Well-Known Member
LemmyGo said:
I have 2x60W 6500k (current) ,4x40W 3200k. What combination do you recommend? My space is 2.4 sq feet (0.2 sq meter) one plant
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All of them if you can. How ever you can get them to fit, just stagger your blue and red spectrum to get as homogeneous as possible.
 
Nutty sKunK

Nutty sKunK

Well-Known Member
You’re slightly heavy on N but that could be due to dry back exacerbating the situation.

Those dead margins in the lower leaves are down to moisture stress! It got too dry before you watered it. Don’t jump the gun adding this or that.
 
GreenGenez421

GreenGenez421

Well-Known Member
Nutty sKunK said:
I don’t think he should flush. Yea it’s heavy on N but not buckling cannoe leaves. Dead margins are from moisture stress

Plant will grow into the soil and use up the nutrients with water and a root stim
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Not if he's been killing it with kindness using the homemade ferts. Most likely unbalanced too, just causing an accumulation. If it were solely a pH issue, I'd be inclined to agree. Simply maintaining good watering practices would eventually snap things back into order. I think he's past that point and will continue to see more decline before improvement. Plus it's also an autoflower, they're not heavy feeders to begin with.
 
Nutty sKunK

Nutty sKunK

Well-Known Member
GreenGenez421 said:
Not if he's been killing it with kindness using the homemade ferts. Most likely unbalanced too, just causing an accumulation. If it were solely a pH issue, I'd be inclined to agree. Simply maintaining good watering practices would eventually snap things back into order. I think he's past that point and will continue to see more decline before improvement. Plus it's also an autoflower, they're not heavy feeders to begin with.
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Ah just saw that post. Sounds as if he gave it those nutrients on day 26 tho? Was it water beforehand?

Might be alright with what he gave it. Best thing for him to do would be get a complete base bloom/veg feed, saves the guess work!
 
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