Top of my soil has a white crust, any idea what this is?

Discussion in 'Marijuana Plant Problems' started by nwaredstar7, Feb 16, 2011.

  1.  
    nwaredstar7

    nwaredstar7 Member

    As title says, the top of my soil has a white crust. Anyone know what this is?

    Healthy plants yet some on the bottom are yellowing and turning brownish gold in some areas and bottom of the plants are droopy. I'm in week 2 of flowering and just started using schultz bloom nutes. I know all of this is basic information and might not be enough but honestly I don't have all the answers of my grow for you. Best I can type of setup, ask anything that would help me help you and I'll try to help you help me =)
  2.  
    Mother's Finest

    Mother's Finest Well-Known Member

    If it's not something you put on top of or inside of the soil, it's almost definately fungus. Pics would be necessary to diagnose your plant's problems.
  3.  
    Kali Soul

    Kali Soul Active Member

    What are your temps and humidity, gotta give more detail man
  4.  
    nwaredstar7

    nwaredstar7 Member

    Temp is about 80 F and humidity is pretty low. Can't say exact but it's a pretty dry space. It doesn't look like a fungus, it looks more like a coating on the top of the soil.
  5.  
    asdfkry

    asdfkry Active Member

    ...perlite? [​IMG] :O
  6.  
    Mother's Finest

    Mother's Finest Well-Known Member

    Sometimes stuff like perlite mixed into the soil will just sit there while the brown, organic matter gets washed downward. Each time you water, more perlite (or whatever) is uncovered.
  7.  
    Pipe Dream

    Pipe Dream Well-Known Member

    Should I be concerned if I notice fungi or mold growing on top of my soil after I apply Peace of Mind® or Happy Frog® fertilizers?
    [FONT=Verdana, Arial, Helvetica, sans-serif]Not at all. This is a normal condition. If fact, the fungi and mold are exactly what Peace of Mind® and Happy Frog® fertilizers should be creating. These are beneficial bacteria which help deliver nutrients to your plants. However, you can reduce the appearance of surface mold by mixing Peace of Mind® or Happy Frog® thoroughly into the top few inches of soil surface and water thoroughly[/FONT]

    http://www.foxfarmfertilizer.com/faqfox-pom-happyfrog.html#anchorpom4

    Maybe this? Justcopy/pasted it could apply to you even if your not using Fox farm products.
  8.  
    nomaninsf

    nomaninsf Well-Known Member

    I have had this happen before. It's hard to tell for sure what your problem is without a pic but for me it was a buildup of salts in my medium. This was back when I used to use General Hydroponics. There nutes are cheap but have a high salt content and can cause nute lockout if you let them build up. Post a pic
  9.  
    nwaredstar7

    nwaredstar7 Member

    Can't get a pic, but I think it may be salt build up. Was using tap water for first 6 weeks and it's decent quality well water but it's slightly hard. If it's not it may be the perlite buildup. Going to start flushing at week 6, strain is Northern Lights #5 so it's a pretty short flower (6-7 weeks according to Nirvana). While you're here, know when to start adding molasses to feeding? I'm on week 2 day 4 of flowering.
  10.  
    nomaninsf

    nomaninsf Well-Known Member

    I have had salt buildup before on the surface that didn't affect the plant. If you want to play it safe you can give them a feeding of just water and Clearex, Flora Kleen, or Final Phase to leach those salts out.
  11.  
    nwaredstar7

    nwaredstar7 Member

    In general it doesn't seem to be affecting the plant very much. The plants seemed unhealthy a day ago and I gave them a feeding of nuts at full strength and today they propped up and look beautiful (been pushing them to the edge of just before burning the entire grow to make them as bushy as possible) so I'm thinking now it's just a slight salt buildup, which will be flushed out a week before chop.

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