Alien OG nutrient deficiency Help!

[lazybudz1]

Okay so I have a Tahoe OG x Alien plant and its in the fifth week of flower. She is showing signs of some deficiency and im having trouble figuring it out. I am using roots organic potting soil and the full line of fox farm nutrients. She is in a 4 gallon pot, and every time I water or feed her the ph is around 6.8-7.0

Please help her out

 

[Stoned4daze61]

Looks like a Molybdenum deficiency. Here is a the description quoted from a marijuana plant diagnoses thread

Molybdenum (Mo)

Molybdenum has proteins that help the plant take nitrogen from the air.

A Molybdenum deficiency causes leaves to have a pale, fringed and scorched look, along with weird or retarded leaf growth. Yellowing of middle leaves can occur as well as twisted younger leaves which will eventually die. Molybdenum deficiencies frequently resemble a nitrogen deficiency. A Molybdenum deficiency shows older chlorotic leaves with rolled margins and stunted growth. Looks like a nitrogen deficiency but with the red tips moving inwards to the middle of the leaves. Molybendum deficiency will usually show up in the older to middle aged leaves, then it moves to the young leaves. Generally a molybdenum deficiency occurs when sulfur and phosphorus are deficient.

Molybdenum toxicity doesn’t cause to many problems, but may cause problems when the human ingests it. Excessive molybdenum in cannabis will look like iron or copper deficiency. Parts affected are by the molybdenum deficiency are: Older leaves.

Problems with Molybdenum being Locked out by Ph Troubles

Soil ph that are under 5.5

Soil

Molybdenum gets locked out of soil growing at ph levels of 2.0-6.5
Molybdenum is absorbed best in soil at a ph level of 7.0-9.5 (Wouldn’t recommend having a soil ph of over 7.0 in soil) anything out of the ranges listed will contribute to a Molybdenum deficiency.

Hydro and Soil less Mediums

Molybdenum gets locked out of Hydro and Soil less Mediums at ph levels of 2.0-5.5
Molybdenum is absorbed best in Hydro and Soil less Mediums at ph levels of 6.0-8.0 (Wouldn’t recommend having a ph over 6.5 in hydro and soil less mediums.) Best range for hydro and soil less mediums is 5.0 to 6.0. Anything out of the ranges listed will contribute to a Molybdenum deficiency.

Solution to fixing a Molybdenum deficiency
One way to fix a Molybdenum deficiency is to foliar spray with Molybdenum, like Miracle Grow All Purpose plant food and Miracle Grow: Tomato Plant Food. These can also be used to mix in with water as well. (Only mixing at ½ strength when using chemical nutrients, or it will cause nutrient burn!)Other nutrients that have Molybdenum in them are: I think Peters All Purpose Plant food does, as well as Greensand, Lime. Green sand and lime is slow/medium absorption, while Peters All Purpose Plant Food is fast absorption.

Now if you added to much chemical nutrients and or organics,( which is hard to burn your plants when using organics) You need to Flush the soil with plain water. You need to use 2 times as much water as the size of the pot, for example: If you have a 5 gallon pot and need to flush it, you need to use 10 gallons of water to rinse out the soil good enough to get rid of excessive nutrients.

 

[lazybudz1]

Thanks stoned4daze61, very helpful! Gotta go to my local hydro store and find something to foliar feed this poor girl..