Brown tips. Under or Over nuted ? Need help!

[bobetz]

Hi ,new grower with nute problems
2 Cream Caramel autos in Coco / Perlite 70/30 ,15 l text pots 250 w HPS , 2' x 3' Grow space (picture 9),

this is link to my previous post : http://forum.growweedeasy.com/forum/...es-need-advice

On 23 of December i slightly burn my 6 day old seedlings with GHE flora trio ,(feeding schedule of Nebula Haze at seeding strength + Sensi Cal Mag xtra 4-0-0 with about 1/4 gallon per plant.)
the result is slightly discolored leaves and slightly burned tips yellow color picture 1 and 2 .
A few days later i water them again with 1/4 gallon per plant with Ph-ed tap water
week later they look like picture 3 and 4 .
I water them again only with Ph-ed tap water and now after two days more in the beginning of week 3 they look like pict 5 and 6 .,7,8
brown burned edges of smaller of plants very much like nutrient burn ,but
i don't gave them nutes for 10 days and may be this brown burned tips are symptom of some kind deficiency.They appeared yesterday
this is my first grow and i am totally confused
One of babies goes fairly well but the other one stays short (with same count of branches but smaller size)

thank you and sorry for my English

[alltatup]

Hi bob, you may find the answers to your problems here: http://www.growweedeasy.com/cannabis...gency-handbook

[bobetz]

thank you alltatup , i read it many times ,but still don't sure .
I am 90 % that they need food ,but after i burned them ...i am very indecisive

[Canuck147]

Hey bobetz Your English is fine.
Your plants started off good and now they still look real good.
The concerned leaves are the older leaves, don't worry about them too much.
Concern yourself with the new growth in the middle. It looks good, nice and green although a little droopy. Maybe overwatered. Let it dry right out before your next feeding.
Be careful with the amount of nutes. Give it something with calcium magnesium.
Keep it growing, you are doing very well.

[Weed Pharma]

What I am seeing is: your plants need Calcium and Potassium-
Go ahead and trim the (first) single leaf showing potassium deficiency- once a leaf is 30-35% damaged, the stress on the plant exceeds any benefit the leaf may be giving to the plant. I would leave the middle leaf as is- until you are certain you have corrected the deficiency- then remove it (or is it worsens to > 35%).
Coco needs Cal/Mag from the start and with each watering. Generally any pH up will have potassium in it.
Otherwise they look good.

[D.A.A.S.69]

Hey Bobetz, growing in coco you need to start with cal-mag, an use it the whole grow.

[bobetz]

Hi everybody, thank you for your help ,
last night i watered her with less then 1/2 seedling strength GH Flora Trio + Sensi Cal Mag extra 2 ml per gallon at .Ph 5.7 tds-185 ppm .
Runoff was Ph 6.6 , tds -168 ppm.(hanna)
Actually i watered coco till runoff with cal mag and nutes before germinate the seeds ,
also spray the jiffy pallets with cal mag solution and feed the seedlings with nutes and cal mag prior to burned them slightly 10 days ago

Today i cutted the lower damaged leaves , the brown color covered almost the whole of the edges middle leaves ,i am little bit concerned about that. Here are some pictures

[Weed Pharma]

Your ppms are very low and should be 2-3 times what you are giving: see quick list below:

• Seedlings, Early Sprouts – 100 to 250
• Early Veg’ Stage – 300 to 400
• Full Vegetation Stage – 450 to 700
• Early Blooming Stage – 750 to 950
• Full Mature Bloom/Ripening Stage – 1000 to 1600

[bobetz]

in my case what is better to wait to next watering and give more nutes, or to water again with doubled nutes and runoff ?
thank you

[Weed Pharma]

Since the new growth on the plant looks OK-
I would wait until next watering and give nutes in the 300-400 range. Then bump up a week later to 400-600 range.
-Damaged leaves wil not repair itself-but can be removed once you have corrected the issue.

[bobetz]

Hey Weed Pharma ,thanks again for your help .Today i am going to water the other plant, bigger one. I will throw away 185 ppm solution from yesterday and make new one with doubled nutes

[Buddy]

Check ph.flush with 6.5 water till water running out is 6.5

[bobetz]

Thank you Buddy, now my runoff is 6.6,but i am afraid to flush because she is very little and i can overwater in such big pots (4 gallons)
most likely i underfeed her and have to go with more nutes

[D.A.A.S.69]

Hey Bobetz, what kind of lights are you using ? Do you have any fans blowing a breeze on them ?