For some reason, every time i find a decent nutrient problem solver,
they dont have pics and when they do have images, they disapear after a
week or 2
so now while i have one up, im downloading all the images, copying the
text and making a copy for OzStoners so i hope you all find it helpfull
or atleast an interesting read :smoke
OverGrow thread i got this all from
most growers these days use 2 or 3 part nutrients, most of these
problems shouldn't appear...more than likely the problem will be a pH
imbalance which can result in the plant showing problems that you can
easily confuse with with other problems or deficiences. So i found 2 pH
charts that are very usefull and show the correct pH ranges for
cannabis and what nutrients will be available at certain pH ranges
Improper pH can look like this
But in some cases, the plants can be in all the
correct ranges but still be dying, lacking in growth, etc. and if you
dont know what your looking for and how to fix these problems, your
entire crop can go to waste so i hope the following helps fellow
growers and newbies alike
Nitrogen is a key Element in the production of Amino
Acids, which are the building block of Proteins. Many plant hormones
contain Nitrogen as well as Chlorophyll, DNA and RNA (Genetic
materials), and a myriad of enzymes that help control and regulate
growth. Nitrogen is the most mobile element.
from this deficiency are distinct in their pattern of yellowing.
Yellowing starts on the older leaves and progresses upward, leaving the
top parts of the plant green.
Notice that the large fan leaves are yellowing and turning purple-ish. from the bottom up.
Feeding with a high N fert will clear it up, like an emulsion of fish at 5-1-1.
Leaves will turn pale green, then yellow evenly. There are no
intervenial striping or yellow patches. Color is uniform over the
entire leaf. Yellowing is expected during flushing, as the plant is
using up all available internal nutrients...
Phosphorous deficiencies are distinct. Purple stems,
leaf stems, leaf veins and stunted growth are a sure sign of a
Phosphorous deficiency. Leaves will also tend to be smaller and dark
green, and may or may not include necrotic patches. Bud size will be
smaller and underdeveloped, as will the root mass.
is used for plant energy by being assimilated into molecules called
Adenosine-tri-phosphate, or ATP. This molecule is necessary for any
plant activity that requires energy such as root growth, flowering,
respiration, and vegetative growth.
A good all-around fertilizer like Peter's 20-20-20 will clear this up.
Potassium deficiencies are identified by necrosis on
the margins of larger fan leaves. Necrotic patches can be seen on the
leaves as well. Leaves will eventually turn yellow, brown and die off.
Most of the plants that show signs of a Potassium deficiency are going
to be the tallest and best looking plants you have.
serves to aid in the process of photosynthesis, nutrient uptake,
respiration, and is a key to sturdy stems and disease resistance.
Having an adequate supply for the plant early in it’s life stage will
keep your seedlings from falling over.
Again, feeding with a
good all-around fertilizer will clear it up as well. You can also use
wood ashes and water them into your soil to fix this. You'll need to
replace your soil's holding capacity of Potassium, and have a surplus
before it will become available to the roots again.
A magnesium deficient plant is identified by
intervenial chlorosis, necrosis, and eventually a lockout of plant
nutrients. The problems starts at the bottom of the plants and works
it’s way up.
Chlorophyll has the same structure as Hemoglobin,
except that it has a magnesium atom in place of the Iron atom.
Chlorophyll is how plants make sugars to feed the process of building
ATP through the Krebs cycle.
Treating with an Epsom salts mix will clear this right up.
If you ever see this in your plants, then you can be
assured that you have this deficiency. Look for yellowing starting from
the top, and progressing down, including the veins of the leaves. Treat
the same as a Mg deficiency.
Sulphur is an important element in
the structures of amino acids and proteins, and is needed for normal
plant respiration and metabolism of sugars and other compounds.
Calcium is an important co-enzyme in the production of
fatty acids, cell membranes, and is necessary for normal mitosis/cell
division. A Ca deficiency will stunt plant growth. Acidic soils may
increase the risk of a Ca def. Treat with limestone.
This is a rare occurrence and is exemplified by small gray or necrotic
patches on the growing shoots which eventually die.
this is done easily by applying a foliar spray of eyewash containing
Boric Acid. That picture is not really the best IMO, but it shows a
gray patch on a leaf
that is indicative of what to look for. This will
most likely occur in outdoor grows.
A copper deficiency is commonly mistaken for an over
fertilization problem, but it is set apart by the growing tips dieing
off first along with the crispy leaves. The new shoots will die from
the tips and margins first, often going brown or even white before they
A foliar feeding with a commercial fungicide containing
Copper (ie. Copper Sulphate) will clear it up, but the damaged leaves
may never recover.
An Iron deficiency will mask a Magnesium deficiency.
If you look at the newer growth, that will be where the plant exhibits
the intervenial chlorosis typically differentiating it from a Magnesium
Notice how the top of the plant is exhibiting intervenial chlorosis and the lower part is unaffected.
A Manganese deficiency exhibits a general chlorosis,
followed by yellowing patches and necrotic patches between the veins of
the larger fan leaves.
A Molybdenum deficient plant will exhibit yellowing
necrotic leaves from the tips inward, with necrotic lesions present
from the tips inward. A very distinctive feature is that it occurs in
the middle of the plant. It also may spread to the rest of the plant if
not stopped, eventually killing your plant.
Elements may be added to your soil mix as you prepare it for planting.
A good Hydroponic nutrient should contain ample micros to get your
plant through its lifecycle.
A Zinc deficient plant is obvious from the wispy new
growth with twisted leaflets at 90°. There is also intervenial
chlorosis at the top of the plant that is commonly confused with an
Notice in this picture that the older grown leaves are relatively unaffected and healthy.
This is a very common problem that can be disguised as an improper pH, or light burning, as well as a myriad of other problems.
The first picture masks as over Nitrification, but notice how the entire leaf is curled under, not just the tip.
second photo displays many problems associated with overferting, some
of which could be a simple imbalance of pH and a certain nutrient/micro
lockout at the given pH.
Over watering / lack of Dissolved Oxygen
Droopy leaves and lower leaf yellowing are indications of persistent over watering problems.
The above picture shows the “claw”: indicative of
over Nitrification. Some growers loadup their plants with Nitrogen
prior to flowering. This will prepare them for the stretch to follow,
and will increase bud production if induced a few weeks prior to
blooming the plant.
Radiant heat is also called “light burn”. Typically,
topmost leaves will become pale green, then turn brown as the burn
progresses. Plants on the outmost edge of the garden will remain a
healthy dark green, with light burned plants directly underneath the
reflectors in a circular pattern.
Well that took me about 45
mins to download then upload the pics again + to copy all the info out,
etc...was well worth the time and effort :smoke
Tutorial written by WantDaChronic for cannanation.com/ozstoners.com taken from information at the new closed overgrow.com faq and forum