Whats wrong with this ? Pics
- Thread starter Cheech 1983
- Start date
Pureblood89
Well-Known Member
looks like the start of a zinc def
Cheech 1983
Member
how should i fix it? use more nutes? cause i have only been using half of whats its been calling for.
Cheech 1983
Member
Its only on the lower feeder leaves..
cadeneli
Active Member
I agree with pureblood. If I'm not mistaken, I vaguely remember telling you the same thing the other day. Zinc deficiencies happen in alkaline soil. Do you have a ph meter? Adjust your ph to 6.5 to 6.7. Id be willing to bet its above 7 at the moment. Now i remember. Thats SSH youre growing.
TaoWolf
Active Member
My humble opinion and advice - Nitrogen, phosphorus, potassium, magnesium, chlorine and zinc* are mobile elements that the plant will take from older leaves and relocate to newer growth if there is either a deficiency, lockout, or other uptake problem (since you stated it is only affecting lower growth). So one of those elements is likely to be your culprit.
The easiest thing to check as far as ruling out an uptake problem is checking that run-off is within a good pH range. If pH is within range, you'll have to differentiate between a true deficiency or a lockout/burn.
Most lockouts/burn are easy to identify and deal with through the simple step of reducing nutrient strength. So that is where I would start if pH was correct. The easiest way to do this since the problem appears to be minor, is to flush and then resume feedings with the strength of given nutrients down by half (in your case to quarter-strength since you were already giving half-strength) and see if the problem resolves (then it is/was a lockout from too strong of a nutrient mix and problem solved) or worsens...
If the problem worsens, you'll have to trouble shoot more and try to identify a specific deficiency or disease and supplement/treat it. But I would try the first two steps first before adding anything extra and possibly making a minor problem into a bigger one.
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*Zinc is variably mobile like Brick Top correctly pointed out below. Mobility of zinc within a plant is dependent on "degree of deficiency, plant species, and nitrogen status of the plant." Just for clarification/as a correction. Thanks.
The easiest thing to check as far as ruling out an uptake problem is checking that run-off is within a good pH range. If pH is within range, you'll have to differentiate between a true deficiency or a lockout/burn.
Most lockouts/burn are easy to identify and deal with through the simple step of reducing nutrient strength. So that is where I would start if pH was correct. The easiest way to do this since the problem appears to be minor, is to flush and then resume feedings with the strength of given nutrients down by half (in your case to quarter-strength since you were already giving half-strength) and see if the problem resolves (then it is/was a lockout from too strong of a nutrient mix and problem solved) or worsens...
If the problem worsens, you'll have to trouble shoot more and try to identify a specific deficiency or disease and supplement/treat it. But I would try the first two steps first before adding anything extra and possibly making a minor problem into a bigger one.
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*Zinc is variably mobile like Brick Top correctly pointed out below. Mobility of zinc within a plant is dependent on "degree of deficiency, plant species, and nitrogen status of the plant." Just for clarification/as a correction. Thanks.
Brick Top
New Member
Nitrogen, phosphorus, potassium and magnesium are phloem-mobile elements, just called mobile elements by growers.
Copper, manganese, molybdenum, sulfur and zinc are intermediate in mobility. They are not very mobile in plants. Some growers call them mobile elements and some call them non-mobile elements. Either way they are not very mobile.
Boron, iron and calcium are relatively immobile, what growers call non-mobile.
Deficiency symptoms of phloem-mobile elements appear earliest and are most pronounced in older leaves.
A deficiency of the non-phloem mobile elements appear first in younger leaves.
(Phloem is the tissue that transports carbohydrates through the plant body. The general term for the conducting cells is Sieve Element. There are two types of Sieve Elements, which are called Sieve Cells and Sieve Tube Members.)
Cheech 1983
Member
Thanx and that seems like the best solution is to adjust ph. Def my fault on not checkin that first.
cadeneli
Active Member
I missed where he said it was only in the lower leaves. I was looking at the type of damage on the leaf. Looks like its yellowing in the inner veinial areas which usually indicates a zinc deficiency. In which you guys are right. Zinc deficiencies start in the younger leaves.
Cheech 1983
Member
So i definetly should adjust my ph?
Cheech 1983
Member
The ph of the soil has been right around 6.1 i bought ph up anyway to adjust to 6.5 could this be the problem or was the ph close enough and the problem may be somthing else?
