MAYDAY--is it deficiency or burn?

To ask somebody to come to the rescue...PLS~~
I have read many articles about nutes deficiency and burn,but i still cant find the same symptom....it tended to be nutes deficiency,cos' i just use tiny nutes and others didnt have any similar symptom, even the smaller one.....
The symptom didn't show at the top of the plant (pic 1st),
but some little leaves in the middle of the plant were damaging.(pic 2nd)
And it was appearing on the big leaves at first(pic 3),i m afraid it becoming worse and worse.........Holpefully you can help this plant and me,I'd like to be sure about whats going on.

to me it looks like you are missing some trace mineral like magnesium

Magnesium is a component of the chlorophyll molecule and serves as a cofactor in most enzymes.

Magnesium deficiency will exhibit a yellowing (which may turn brown) and interveinal chlorosis beginning in the older leaves. The older leaves will be the first to develop interveinal chlorosis. Starting at leaf margin or tip and progressing inward between the veins. Notice how the veins remain somewhat green though as can be seen in figure 15.
Notice how in Figure 16 and 17 the leaves curl upwards like they're praying? They're praying for Mg! The tips may also twist.
This can be quickly resolved by watering with 1 tablespoon Epsom salts/gallon of water. Until you can correct nutrient lockout, try foliar feeding. That way the plants get all the nitrogen and Mg they need. The plants can be foliar feed at ½ teaspoon/quart of Epsom salts (first powdered and dissolved in some hot water). When mixing up soil, use 2 teaspoon dolomite lime per gallon of soil.
If the starting water is above 200 ppm, that is pretty hard water, that will lock out mg with all of the calcium in the water. Either add a 1/4 teaspoon per gallon of epsom salts or lime (both will effectively reduce the lockout or invest into a reverse osmosis water filter.
Mg can get locked-up by too much Ca, Cl or ammonium nitrogen. Don't overdo Mg or you'll lock up other nutrients.

http://www.marijuana-seeds.net/Thanks-ThankYou.htm

looks like a combo of calcium and magnesium def.

here is a more complete site for diagnosis of problems

http://www.icmag.com/ic/showthread.php?t=11688

i would suggest going to the hydro store or ordering some calmag plus, follow the directions and cut the dosage in half and you will be great

FLo

yes,,it's really like Ca and Meg problem,,,,
but it's similar to Boron deficiency too~~~
shall i wait a little longer till it's conspicuous??

its not boron.. and a boron def. is extremely rare unless using poor quality ferts or having ph problems.. neither of which you seem to have..

most water and nutes dont have enough calcium or magnesium especially when using reverse osmosis water..

dont wait, dose it with some calmag plus and your problems will be solved

Mag/cal thing easily remedied.

3ml per gallon (or 3.8l) is what I use in every feeding. The instructions say to use 5ml but I found that to be just a bit too much.

Cleared it up very quickly. Make sure you are ph'ing your water.

Boneman said:

3ml per gallon (or 3.8l) is what I use in every feeding. The instructions say to use 5ml but I found that to be just a bit too much.

Cleared it up very quickly. Make sure you are ph'ing your water.

Click to expand...

You mean 3ml of nutes per gallon??
what kind of nutes?

HONGKONG GIRL said:

You mean 3ml of nutes per gallon??
what kind of nutes?

Click to expand...

Yes... i think they are talking about "CalMag"

http://www.westcoastgrowers.com/botanicarenew.htm

hi..every one ...i found another symptom that was the margin of leaves upwards....
was it abous deficiency??

Hi HKG, the leaves curling up means the plant is too hot, you might want to raise your light a bit.

is it curling up like rolling a joint or is it folding in half like a piece of paper... curling could be heat while the folding could be another sign of a mag. deficiency.