Yellowing leaves in flowering. Need help.

elfo777

elfo777

Well-Known Member
Hello,

I am 34 days into flowering and my plants are yellowing. I don't know what's going on, I've been feeding peruvian seabird guano since flowering started, I also used NPK in small amounts and bio bloom. I always use half or les of recommended amount.

Are my plants hungry or overfed? If they are hungry, what kind of deficiency is it? I suspect it has something to do with potassium. Im not used to growing large plants. Using 400W HPS, I don't measure PH because all is organic and I was told not to. Can someone help me, please?
 

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GBAUTO

GBAUTO

Well-Known Member
elfo777 said:
Hello,

I am 34 days into flowering and my plants are yellowing. I don't know what's going on, I've been feeding peruvian seabird guano since flowering started, I also used NPK in small amounts and bio bloom. I always use half or les of recommended amount.

Are my plants hungry or overfed? If they are hungry, what kind of deficiency is it? I suspect it has something to do with potassium. Im not used to growing large plants. Using 400W HPS, I don't measure PH because all is organic and I was told not to. Can someone help me, please?
Click to expand...
Looks good so far. I think that you may have a Ca/Mg deficiency. Even though you use organics, it's still vital to know if your soul pH is in a useful range for the plant to absorb all of the available nutes. I hope that the image I uploaded helps.
 

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Nutty sKunK

Nutty sKunK

Well-Known Member
GBAUTO said:
Looks good so far. I think that you may have a Ca/Mg deficiency. Even though you use organics, it's still vital to know if your soul pH is in a useful range for the plant to absorb all of the available nutes. I hope that the image I uploaded helps.
Click to expand...
Cal/Mag? Where?

All I see is the classic signs of zinc deficiency. That classic intervienal striping on newest growth with pale edges.

It could be a case of too much calcium blocking zinc. So would be a bad idea just to throw cal/Mag at it.

@elfo777 Are you supplementing any micro nutrients?
 

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N

nmibud

Well-Known Member
That's not a zinc issue,looks like a slight calcium deficiency.You may have switched to bloom nute too soon,wait till they are done stretching.
 
elfo777

elfo777

Well-Known Member
I've been using this guano (image). There you can see the micronutrients listed. It is in spanish but it is understandable. Is it possible that it is a potassium deficiency? This peruvian guano is low on potassium from what I see in the label. I've been looking into this deficiency and it looks really similar to mine. Only fed epsom salts once or twice. Bio Bloom in small doses and fish mix until they stopped stretching.
 

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