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Potassium Deficiency??? seedlings!

  • by masterlights
  • Apr 28 2010 08:51 PM
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Posted 28 April 2010 - 08:51 PM

Ok my seedlings are 2 weeks and 3 days old today.For the first 2 weeks they were in a starter deep cell green house with 3.5" deep cells.the medium was 3 parts roots organic,light warrior,coco and they had root riot starter plugs in the middle.first 2 weeks in the ghouse everything was good except i noticed slight yellowing on new set of leaves which i knew they were eating up all the N out of the 1/3 roots soil.

A couple days after i transplated em into their 1 gal pots of the same medium i started noticing purplish stems on all the plants and small brown spots on some of the old fan leaves of just a couple of the seedlings.

THey didnt get fed at all until yesterday with a 1/4 strength of grow big and a splash of hygrozyme.

Is this most likely potassium def????
What should i change next go around?Just use 100% roots soil and maybe hit em up with a light nute earlier??

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Replies (5)

  • budrot fighter

  • shogo
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Posted 28 April 2010 - 08:57 PM

looks like a slight P overload to me make sure you have your micro's covered too. I don't think P bur shows on lower leaves first or anuythin like that

http://forum.grassci...-burn-pics.html

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  • Dankafied
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Posted 28 April 2010 - 09:02 PM

Roots Organic and Light Warrior have enough nutes already in the soil to last a good 3 to 4 weeks. Roots Organic is considered a hot soil. that could just be nute burn. The coco is gonna throw off ur PH in the long run. PH doesnt really factor in the first 3 to 4 weeks. Other than that they look good! nutrient deficiencies dont really occur until after the first 3 or 4 weeks. anything before that is just nute burn. you should never plants nutes during seedling stage. put faith in the soil!

Edited by Dankafied, 28 April 2010 - 09:06 PM.


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Posted 28 April 2010 - 09:50 PM

well it cant be nute burn bc i know what nute burn looks like..the tips of the leaves brown a bit..thats not on any of the leaves.i would of put faith in the soil but how is it after 2 weeks i have purple stems and spots now.

the seedlings grew great for the first 2 weeks..then growth slowed and the purple stems started happening.now i know their somewhat stunted bc the growth isnt what it should be.

i dont even think light warrior has any nutrients at all..its just seed starter so the 1/3 of the roots organic medium in the tray i guess just wasnt enough nutes to last a couple weeks.im kinda worried bc ive had this problem in veg for a while now and am running out of ideas.the only thing i havent tried is feeding them a light dose of nutes early in week 2.


the water i was using was just tap water that was sit out to evaporate and had a bubbler in it.

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Posted 28 April 2010 - 09:57 PM

and i read that a p deficiency causes purple stems and brown spots to develop on the leaves.cant be a p overload bc they havent gotten fed before the problems started.ive seen results of hot soil and it causes the leaf tips to brown..that didnt happen to my babies bc i only had a 1/3 part roots organic.

is it possible the seedlings used up all the N and P in the medium while in the propagation tray and thus developed the deficiency???

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Posted 28 April 2010 - 11:26 PM

shit i didnt mean potassium i meant phosphorus! deficiency:rolleyes:


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