il_zed

Hi guys

I'm groving 4 white widow plants actally in the 7°week of flowering.

Almost 10 days ago they started to turn the older leaves on yellow and days later they came out some brown dots on the yellows leaves.
The newer part pf the plants look like healty, all the leaves are green and in a perfect shape. Only days ago I saw that just one or two newer leaves turned yellow with brown dots.

The plants are gorwing in a mixture of soil and coconut, and I feed them with biobizz product since their 2 week of veg.
I stop to feed them a week ago beacuse I saw some leaves curling down and as I read here, it means that they are on overferlilization, so I quit fertilizer and I gave them only water strictly with ph between 6.5 and 7.

What do you think can I do to brink them on the best condition untill the 11° week of flowering, so still for a month?

Roach

check this out while waiting for a more advanced grower to reply.


Key on Nutrient Disorders

To use the Problem-Solver, simply start at #1 below. When you think you've found the problem, read the Nutrients section to learn more about it. Diagnose carefully before
making major changes.
1) a) If the problem affects only the bottom or middle of the plant go to #2.
b) If it affects only the top of the plant or the growing tips, skip to #10. If the problem seems to affect the entire plant equally, skip to #6.

2) a) Leaves are a uniform yellow or light green; leaves die & drop; growth is slow. Leaf margins are not curled-up noticeably. >> Nitrogen (N) deficiency.
b) If not, go to #3.

3) a) Margins of the leaves are turned up, and the tips may be twisted. Leaves are yellowing (and may turn brown), but the veins remain somewhat green. >> Magnesium (Mg) deficiency.
b) If not, go to #4.

4) a) Leaves are browning or yellowing. Yellow, brown, or necrotic (dead) patches, especially around the edges of the leaf, which may be curled. Plant may be too tall. >> Potassium (K) deficiency.
b) If not, keep reading…

5) a) Leaves are dark green or red/purple. Stems and petioles may have purple & red on them. Leaves may turn yellow or curl under. Leaf may drop easily. Growth may be slow and
leaves may be small. >> Phosphorous (P) deficiency.
b) If not, go to #6.

6) a) Tips of leaves are yellow, brown, or dead. Plant otherwise looks healthy & green. Stems may be soft >> Over-fertilization (especially N), over-watering, damaged roots, or
insufficient soil aeration (use more sand or perlite. Occasionally due to not enough N, P, or K.
b) If not, go to #7.

7) a) Leaves are curled under like a ram's horn, and are dark green, gray,
brown, or gold. >> Over-fertilization (too much N).
b) If not, go to #8…

8) a) The plant is wilted, even though the soil is moist. >>Over-fertilization, soggy soil, damaged roots, disease; copper deficiency (very unlikely).
b) If not, go to #9.

9) a) Plants won't flower, even though they get 12 hours of darkness for over 2 weeks. >> The night period is not completely dark. Too much nitrogen. Too much pruning or cloning.
b) If not, go to #10...

10) a) Leaves are yellow or white, but the veins are mostly green. >> Iron (Fe) deficiency.
b) If not, #11.

11) a) Leaves are light green or yellow beginning at the base, while the leaf
margins remain green. Necrotic spots may be between veins. Leaves are not twisted. >> Manganese (Mn) deficiency.
b) If not, #12.

12) a) Leaves are twisted. Otherwise, pretty much like #11. >> Zinc (Zn)
deficiency.
b) If not, #13.

13) a) Leaves twist, then turn brown or die. >> The lights are too close to the plant. Rarely, a Calcium (Ca) or Boron (B) deficiency.
b) If not… You may just have a weak plant.


Cannabis Nutrient Disorders

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il_zed

it looks like my are on the case n°2..

deficiency on (N) Nitrogen.

SmokeaJoint

7th week of flowering, they're gonna turn a little yellow. Its natural for the plant to start using less nitrogen as the flowering progresses. Too much N and it will delay flowering. My say is give it a touch of Mg and continue with what you're doing. Not too much longer, and you're gonna be ready to flush. Pics?

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farmergiles

I agree, best not to give them too much N now.
N deficiency wouldn't cause spotting either- you would most likely see the lower leaves go yellow uniformly if they lacked N.

Most likely mg def, possibly calcium. As ever pics would help .

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Dandaweedman

are the leaf edges looking a bit crispy as well?

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