Nute Burn???

SmokinOGkushTrees

Active Member
My plant has been in a Veg. state for 3.5 weeks now.Outdoors. It is 14-15 inches tall and lookin very healty. It is in a 5 gallon pot, FoxFarm soil (ocean forest), i have fed it once with Super Natural Gro terra (half the recomended amount), and when planted i used Super Thrive. I fed it 6 days ago with the Gro Terra(half recomended dosage), and 2 days ago with half the amount of Super Thrive. I had a few spider mites or even aphids land on my plant and i have been spraying the leaves and underleaves with water and a very light amount of dishsoap, then re spraying again with water. All at night time with no sun out. all bugs gone. plant looks GREAT EXCEPT FOR THIS SHIT!!!! (ph is @ 7.2, not over watered, temps have been getting into the 95+ lately, and it has only been getting 8 hours of direct sunlight.) why do i have brown spots?






 

SmokinOGkushTrees

Active Member
when i watered again, i used twice as much water and no nutes. it has been 4 days from then. It is still spreading but less rapidly and on fewer leaves. Stem is green and strong, leaves surrounding infected leaves look great. but one of my concerns is that the new foilage is starting to get brown spots, not just the larger leaves.
It is in only 8 hours of sun because i am vegging in the shade until about 4.5 weeks. once i get there i will place in location to get 12+hours of direct sunlight. But before i do that i need to found out my problem. I highly doubt overwatering is the case, i live in hot/dry conditions and i water about twice a week. I think it might be a Magnesium build up between my soil/nute combo. other than that, i am clueless. could it be my plant is trying to flower and i am feeding it veg. nutes and that there is a lack of nutes instead of too much?? i am lost here, everything looked healty until about 6 days ago when i started spraying the leaves with water because of dry/hot conditions (which was very light, and a mist not a spray, and it was at dark) It has healthy new growth at the top 5 inches, all damage looks below the 5 inch line. stem is green, and only about 15% of the leaves are showing signs of brown spots and blotches, and only new growth is curling downwards (not all, but some). Let me know if you have any answers.​
 
it could be a nutrient deficiency
google magnesium deficiency

try putting organic matter on soil like manure buy from (lowe or home depot) its won't harm plant and may help.
 

SmokinOGkushTrees

Active Member
i got a reply from another Forum saying that it could be a Calcium and Manganese deficiency. the nutes i am using now have a 0.005% of Manganese but i see no calcium? he said it is not nute burn at all? i am baffled. i think i might be going into flowering and i need flower nutes.
 

Motherhugger

Well-Known Member
My plant has been in a Veg. state for 3.5 weeks now.Outdoors. It is 14-15 inches tall and lookin very healty. It is in a 5 gallon pot, FoxFarm soil (ocean forest), i have fed it once with Super Natural Gro terra (half the recomended amount), and when planted i used Super Thrive. I fed it 6 days ago with the Gro Terra(half recomended dosage), and 2 days ago with half the amount of Super Thrive. I had a few spider mites or even aphids land on my plant and i have been spraying the leaves and underleaves with water and a very light amount of dishsoap, then re spraying again with water. All at night time with no sun out. all bugs gone. plant looks GREAT EXCEPT FOR THIS SHIT!!!! (ph is @ 7.2, not over watered, temps have been getting into the 95+ lately, and it has only been getting 8 hours of direct sunlight.) why do i have brown spots?






About Magnesium troubles...

There are no visible symptoms in the first 3 – 4 weeks, the plant continues to grow well, is dark green and looks healthy.
The deficiency symptoms first become visible in cannabis after 4 – 6 weeks when small, rust brown necrotic spots and/or cloud-like chlorosis appear under the flowering top on the middle-aged leaves. The color of the young leaves and the development of the flowers remains normal.
The size and number of the rust brown spots increases on the leaves while the chlorosis also spreads and becomes yellower.
The symptoms spread throughout the plant which will now look a sorry sight.
If it is a serious deficiency the young leaves will also become chlorotic and production will fall.

Developments in chronological order:

Symptoms

Magnesium is mobile in the marijuana plant so if there is a deficiency, the chloroplasts in the middle-aged leaves that are below the flowering top are broken down and the magnesium is transported to the young parts. This process of breaking down the chlorophyll is manifested in the rust brown spots and/or vague, cloud-like chlorotic spots between the veins. It is more difficult to extract magnesium from the older leaves because the magnesium is an intrinsic part of the organic material. A minor magnesium deficiency has little effect on flowering despite the fact that the formation of flowers makes the magnesium deficiency symptoms worse.

Development

There are no visible symptoms in the first 3 – 4 weeks, the plant continues to grow well, is dark green and looks healthy.

The deficiency symptoms first become visible in cannabis after 4 – 6 weeks when small, rust brown necrotic spots and/or cloud-like chlorosis appear under the flowering top on the middle-aged leaves. The colour of the young leaves and the development of the flowers is still normal.
The size and number of the rust brown spots increases on the leaves while the chlorosis also increases and becomes yellower.
The symptoms spread throughout the plant which will now look a sorry sight.
If it is a serious deficiency the young leaves will also become chlorotic and production will fall.

Possible causes

Magnesium deficiencies in cannabis occur more often relative to other deficiencies. Magnesium deficiency in the root environment can also occur when magnesium levels are normal or high as well as when there is a deficiency. This is because absorption can be slowed down by all sorts of circumstances.

Some of these are:

A very wet, cold and/or acidic root environment.
High levels of potassium, ammonium and/or calcium (for example a lot of lime in the tap water or lime rich, clay ground) compared with the magnesium levels.
Limited root system and a heavy load on the plants.
High EC in the medium, inhibited evaporation.

What should you do?

Use fertilizers that contain magnesium as a preventative measure and spray with Epsom salts as a curative measure.

Check the temperature, humidity, EC and pH in the soil or substrate.
Go to the shop for expert advice. They specialize in this crop and have the right products available. Correctly formulated fertilizer contains sufficient magnesium.
If it has been established that there is a deficiency you should spray with a 2% solution of Epsom salts.

Fertilizing via the roots: Inorganic: Epsom salts on hydro, kieserite on soil. Organic: old, rotten stable or turkey manure.

Correct possible causes: If the pH is too low (< 5) when cultivating in soil use turkey manure which contains magnesium. With hydro cultivation temporarily drip feed the nutrient solution at a higher pH of 6.5. If the EC is too high rinse and/or drip feed with just tap water temporarily. When cultivating inside keep the root temperature above 19 ºC (20-25 ºC).

A little extra magnesium won’t do any harm and excess magnesium doesn’t occur very often when cultivating with soil. If there is too much magnesium, calcium absorption will slow down and it will look like there is too much salt because growth will slow down and the crop will turn dark green.
 

SmokinOGkushTrees

Active Member
That was very good info. That is exactly what went down, and now i know my problem. If new leaves are starting to curl does that mean my plant is NO GOOD? there is a lot of signs that there is life left. And there are a lot more green leaves than spotted ones. it is also just starting to pre flower, should i wait it out or chalk up my losses.?? Thanks again, that was the best answer ive got all week!
 

SmokinOGkushTrees

Active Member
i gave them a feed with Vermi T Solution (organic), hopefully i see some results in the next 48 hours. i will post new pics in the morning.
 
I used vermin t for years . i get best result . here what i do . when light on and i leave on for 30 min then i turn off the lights . i use little household light and spray plants with vermin t . leave let it dry out in about hour or so . the flip the lights back on . it help root break down nutes and then uptake the nutes . it the shit !
 
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