Is this mg deficiency?

[VladTheInhaler]

This is apollo 11 f2 cca 3 weeks, fed it once with 7-3-6 fertilizer at 1/4 strength. Runoff pH is between 6,4 and 6,8.
Is this lack of mg? My ferts do not contain one mg of magnezium, so it's my first suspition.

Sorry for those crappy phone pics.

 

[Guest]

Looks like a little overwatering, maybe a bit of heat.The top looks alright I reckon it'll grow out out of it.I had to put in my two cents 'cause your name made my day!PEACE!!!MUCHA LUCHA!!!

 

[bitpoop21]

I see this all the time
quit using crapy fert's
use canna or advance nutrients or a good complet hydo nutrients
if you are going to do it then do it right
advance nutrence will dubble the thc when used right compared with crappy grow fert's
Iguana Juice Bloom and grow from advance nutrients will put a smile on your face.

 

[Guest]

http://www.icmag.com/ic/showthread.php?t=11688&highlight=complete+guide+sick+plants

 

[VladTheInhaler]

I see this all the time
quit using crapy fert's
use canna or advance nutrients or a good complet hydo nutrients
if you are going to do it then do it right
advance nutrence will dubble the thc when used right compared with crappy grow fert's
Iguana Juice Bloom and grow from advance nutrients will put a smile on your face.

I would use those if they were availible, but as it is, I'm forced to use what I can. The only hydro ferts around here are ment to be used with strawberrys. I currently use this fert for veg:
http://www.compo-hobby.de/download.aspx?id_att=2762

I water this plant only when leaves get a bit droopy, which is about every 4-5 days. It's probably a bit hot in the box, but I can't do much about it since outside the box temps aren't any better either.
My question is: do I need to add some Mg? Or am I lacking something else. Based on the guide I would say it's Mg deficiency but I really need another opinion.

 

[Blackvelvet]

Did you add dolomite lime to your soil mix? This would have provided both calcium and magnesium.

You can't really add dol. lime now because your ph is on the high side. You can add calcium and magnesium to your water. 1/8 teaspoon epsom salts and calcium nitrate per gallon (3.8 liters) of water along with the regular fert. Calcium chloride could be used instead of calcium nitrate but will take the % ca and netweight of the bottle to give you a rate of about 30 ppm ca. Calcium chloride is sold under names like blossom end rot stopper for tomatoes.

Use the regular fert at about 1 teaspoon per gallon (3.8 liters) with every watering. If you add calcium nitrate, reduce this to 3/4 teaspoon. Ph adjust the fert water after mixing for best results.

When watering, 20% of what you apply should be runoff out the bottom. You want runoff.

 

[VladTheInhaler]

Thanks BV. I didn't use any dolomite lime in the soil mix. Later, upon checking I found out that there is absolutely no magnesium in my soil. I used the same soil for my balcony bagseed grow and it works just fine.
I guess every strain is different, probably sun vs cfl's also makes difference.

 

[Blackvelvet]

I guess every strain is different, probably sun vs cfl's also makes difference.

No. Every strain is the same. They require both calcium and magnesium to grow and function. No big deal. Add calcium and magnesium to your fert water.

 

[highallthetime]

soil and water ph both at 6.4 - 6.7 never no more then 6.8. Most ph testers are .09 or .9 off. Be on the safe side go acid. Cal/mag however is "end rot control for tomatoes. Still looks more like a heat issue to me.

More info on lighting
Grow room size - H * W * D
Vented ? Yes or No
Clones or Seeds.
Heat shield ? Yes or No
Scrubber ? Yes or No. Change or Check it often for clumps from moisture. Witch block air flow. It will start to smell funky and have mold in it.
TEMP and RH ? Lights ON/OFF - 10 deg aether way. NO 60 - 80 climates causes droutes. Just look at my outdoor garden. 68 - 78* F should be fine.

 

[highallthetime]

auto ph meter adjusters work nice also. Search icmag the best site for info. They work for hydro. Not sure about soil's. Maybe your feeding water. That is a time saver for me right there.

 

[Ganja Guerrilla]

thats a potassium def,

although I dont read german, the label shows the npk values,
your ferts are fine they contain all your micro nutes, you need no magnesium suplemental additives

you only fed 1/4 strength , time to stepup the nutes shes hungry

go to 50% strength now if you see signs of improvement & you will, feed full strength next feeding

 

[VladTheInhaler]

The plant is in the veg room of my NGB style box, it's vented passively for now, 24/7 under 46 Watts of cfls, the temps are usually 4-5 deg. C over the outside temps. Dimensions of the veg room are something like : 12"W X 18"H X 14" D.
Ganja Guerilla, are U sure? They don't mention Mg anywhere on the label.

 

[HeadyPete]

I guess every strain is different, probably sun vs cfl's also makes difference.

No. Every strain is the same. They require both calcium and magnesium to grow and function. No big deal. Add calcium and magnesium to your fert water.

Every strain is not the same and if Blackvelvet ever grew a mj plant, he might know that. They use the same nutes but in very different amounts. Only someone with real grow experience would know that. The noob knows more about mj than the poser.

Don't take grow advice from posers. They will mess you up.

I'm about due for another neg rep.......

GG is right, Potassium def, for sure. Not to say that you don't have a cal and or mag issue coming up as well. You must provide all the macros, secondaries and micros for your plant, at the correct ph. Kelp is a great source of K, along with plant hormones and micros.

BTW I see no calcium in your fert. Get some CalMag.

Cal will show up as brown burnt crispy spots on the leaves, and mag def turns your leaves light green, while the veins stay dark green.

My LUI is a pig for cal/mag, even with dolomite in the soil. If I stopped the CalMax (5ml/4L), my girls would look like they hit puberty and got nailed with severe acne.

You must find better nutes or you will never get the results you are looking for.

Commit this link to memory, it is your sick plant bible: http://www.icmag.com/ic/showthread.php?t=11688

Potassium (K) Mobile Element and Macro Element

Potassium plays a big role as well. Having good amounts of potassium in your plants helps in having sturdy and thick stems, disease-resistance, water respiration, as well aids in photosynthesis. Potassium is also found in the whole plant. It is necessary for all activities having to do with water transportation. Potassium is necessary for all stages of growth, especially important in the development of Buds.

Having to little of Potassium in your plants causes the plants leaves to show retarded growth and show a scorched tip and edges around the leaves. Plants may stretch and your branches can be easily broken or weak. Don’t get this deficiency confused with iron, because it almost acts like iron but to tell the difference in the two is: for potassium the tips of the leaves curl and the edges burn and die. Older leaves may show a red color and leaves could curl upwards. Dead patches (Necrosis) can happen on the margins of larger fan leaves thus, the leaves will eventually die off and turn brown. The Older leaves will show different patches of color (mottle) and turn yellow between the veins, following by whole leaves that turn dark yellow and die. The plants overall growth slows down, mostly when they are in vegetative stage. To little amount of potassium also slows the growth of buds during flowering stages. Dark edges will appear around the edges of the leaf when the deficiency is starting to happen. When your Relative humidity is low, you can almost bet your going to soon get a potassium deficiency from your plants perspiration.
Potassium can get poorly absorbed when having too much Calcium or ammonium nitrogen, and maybe cold weather. Having to much sodium (Na) causes potassium to be displaced. SO keep those in mind… Parts affected by a Potassium Deficiency are: older leaves and leaf margins.


When you have too much Potassium in your soil, it can lead to big troubles, like salt damage and acid fixation of the root system, as well as too much potassium can cause a calcium deficiency. Your fan leaves will show like a light to a dark yellow to whitish color in between the veins. Due to a molecular imbalance, potassium toxicity can cause a reduced uptake and lead to the deficiencies of Mg, and in some cases, Ca. Also leads to the other nutrients to not be absorbed properly leading to lots of other deficiency such as: magnesium, manganese, zinc and iron and can cause problems with calcium as well.



Problems with Potassium being locked out by PH troubles
Soils with excessive Leeching and High ph soils and or water.Soils that are potassium fixated. An excess of kitchen salts (sodium) in the root system/enviroment.


Soil

Potassium gets locked out of soil growing at ph levels of 4.0-5.5
Potassium is absorbed best in soil at a ph level of 6.0-9.5. (Wouldn’t recommend having a ph of over 7.0 in soil) anything out of the ranges listed will contribute to a Potassium deficiency.


Hydro and Soil less Mediums

Potassium gets locked out of Hydro and Soil less Mediums at ph levels of 4.0-4.5, 6.0-6.5.
Potassium is absorbed best in Hydro and Soil less Mediums at ph levels of 4.7-5.3, 6.7-8.5. (Wouldn’t recommend having a ph over 6.5 in hydro and soil less mediums.) Best range for hydro and soil less mediums is 5.0 to 6.0. Anything out of the ranges listed will contribute to a potassium deficiency.



Solution to fixing a Potassium deficiency
Any Chemical/Organic nutrients that have potassium in them will fix a potassium deficiency. Again Peters All Purpose plant food 20-20-20, will cure the potassium deficiency , Miracle grow Tomato plant food, Miracle grow All purpose plant food.( Only mixing at ½ strength when using chemical nutrients, or it will cause nutrient burn!) Some other supplements of potassium are: Wood ashes, which are fast absorption, Kelp Meal, which is medium absorption, Greensand, which is slow absorption, granite dust, which is slow absorption. Sulfate of Potash, Sulfate of Potash Magnesia, Muriate of Potash, which are medium absorption. FOXFARM GROW BIG HYDROPONIC CONCENTRATE, which is fast absorption. (FFGB can bring your ph down as well) Earth Juice Meta-K, which is fast acting. (Can bring down your ph as well) Leaves will never recover, but the plant will show recovery after about 4 to 5 days when using a fast acting nutrient.

Note: Wood Ashes, can make your ph go up a bit, so please monitor your ph when using it.
Now if you added to much chemical nutrients and or organics, (which is hard to burn your plants when using organics) you need to flush the soil with plain water. You need to use 2 times as much water as the size of the pot, for example: If you have a 5 gallon pot and need to flush it, you need to use 10 gallons of water to rinse out the soil good enough to get rid of excessive nutrients.


Picture 1 and 2 shows a Potassium deficiency ( Thank You General Ganja for letting me use Picture 1!)