yellowing lower leaves with brown spots

Hi i need a little help diagnosing this plant problem. I have reffered to the walkthroughs and plant defficiancy guides on this site and yet am slightly unsure about exactly what i have going on. My enviroment is pretty controlled with temperatures right bellow 80 degrees constant air exchange and a humidity right around 50. I also make sure to test the pH of my water with every feeding and it is consistently in the middle 6 range(6.4-6.7) I have been feeding at half strength flower nutes( NSR Greenleaves Bloom juice) every other watering. I make sure the soil is dry before watering which works out to about one watering every 2 or 3 days. These particullary plants were veg'd for 3 weeks and have been flowering for almost 3, and this leaf problem has only shown itself in the last 5 or 6 days and only seems to affect the lower third of the plant... alright on to the pictures

Yea, that happens in flower. If we are talking the lower third of the plant and like 30% of the leaf then its pretty much normal for the plant to use up the stored nutrients in the lower leaf. The only indoor grow I have had that didnt yellow untill the eigth week of flower was an aeroponic grow where I used calmag along with A B Nutrients.

BTW,
Welcome to rollitup.

Mine are in the 5th week of flowering and doing exactly the same. I don't have any answers for you, as this is my first grow, so it's all new to me, but going by the articles on the site, it looks like an Mg deficiency. I have mine in Miracle Gro organic soil, just foliar feeding for the last two weeks, but I'm losing my plant pretty quick. Going to try Epsom salt foliar feed today. I'll let you know how that goes.

Not normal for week 3 at all! Just add a lil epsom to the feed water and ur leaves should start to get a lil color back within a day or 2.
Its never a good idea to foilar feed or spray ur plants with anything in flower unless its absolutely neccesary (like a bug infestation).

cruzer101 said:

Yea, that happens in flower. If we are talking the lower third of the plant and like 30% of the leaf then its pretty much normal for the plant to use up the stored nutrients in the lower leaf. The only indoor grow I have had that didnt yellow untill the eigth week of flower was an aeroponic grow where I used calmag along with A B Nutrients.

BTW,
Welcome to rollitup.

Click to expand...

Should the plant be using stored energy from the leaves this early in flowering?He is only using half strength nutes.

I have had it happen early in flower yes. Usually I just pull them off.
It really depends on how many are on the plant. If you just have a few lower, then yes get rid of them, they are done. If the yellowing/orange spots whatever continues up the plant or surrounds it well yea, we have a problem.

There are several reasons why lower leaf yellow, Like our friend suggested, NO WAY IN WEEK #3 and suggested to add Epsom salts. Sure if you using hard water 1/4 tsp of Epsom salts per gallon will help relieve the lockout caused by calcium but this grower is using R/O water and I don't think thats the issue.

Well to each his own, I have seen hydro gardens destroyed by Epsom salts. Like molasses, people read they should add this, but like Epsom salts, if not used correctly it causes problems. There are products out there that have been designed to do these things and are Ph balanced. Like Cal mag or sweeteners for hydro. We just don't want to pay for them.

I am just one grower in many here at rollitup. I try and answer questions based on what I read and what I have experienced.

thanks to all that have responded, and for the kind welcome cruzer101, i feel like I am still a little stumped as what to do and i don't just want to add epsom salt so would it be best to get a cal mag supplement? thanks again everybody

I doubt thats your problem.
Here is a couple pages from Jose Cervantes Growers bible.

Keep in mind, He is talking about a plant in Veg cycle.






Looks more like this to me,




.

i cant see the pages you are referencing?

check your ph run off, sometimes in flowering my ph drops low. when i adjusted my ph 5 days later boom! healthy mama

stilljonzen said:

check your ph run off, sometimes in flowering my ph drops low. when i adjusted my ph 5 days later boom! healthy mama

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your plants are deficient but because i believe you are not flushing in between feedings. you have lock out. too much nutes built up on roots. flush them away with rinse agent or with proper ph'd water for a few waterings and it should get better

I water with regular ph'd water inbetween every administration on nutrients.. This isn't enough to flush out the built up nutrients? And forgive me what is a rinsing agent?

Clearex Nutient Salt Leaching Solution 1 Gallon:


CLEAREX™ Salt Leaching Solution

The #1 salt leaching solution in North America.

A common cause of crop failure can be traced to the build up of nutrient salt deposits in soils or soilless grow media. High salt concentrations in the soil solution cause a shrinkage of plant cell protoplasm away from the cell wall as a result of osmosis. This condition, known as plasmolysis, can eventually lead to irreversible wilting.

CLEAREX™ is a scientifically formulated isotonic drench solution, which effectively binds with the excess nutrient salt and safely leaches it from the soil. Leaching with tap or deionized water can lead to hypotonic conditions which cause cell lysis with outflow of essential electrolytes and nutrients. This causes tissue
damage leading to serious pathogenic disorders such as bacterial and fungal infections. CLEAREX™ is isotonic, therefore, it creates a safe osmotic environment which allows plant cells to maintain an optimal turgor pressure during treatment.

CLEAREX™ can also be used at the end of a crop’s growth cycle to trigger the last reproductive stage of the plant, forcing it to process and assimilate endogenous nutrients. CLEAREX™ contains specific electrolytes and selected mono and disaccharides which provide energy for the biosynthesis of important plant metabolites and macromolecules. Pre harvest treatments with CLEAREX™ are known to enhance the flavor and increase yields in fruits, vegetables, and culinary herbs by flushing out extraneous chemical nutrients.

CLEAREX™ Salt Leaching Directions

Before applying CLEAREX™, foliar spray plants with pure water. Use CLEAREX™ in the early morning or evenings.

Soil Containers and Gardens

Use 1/2 to one ounce (15-30 ml) of CLEAREX™ per gallon of water. Pour one to two quarts over plants every seven to twenty-one days.

For container gardens, achieve a minimum 80–90% run-off. Water and fertilize as usual.

Hydroponic Systems

Use CLEAREX™ with every one to two reservoir changes. Use ½ to 1 ounce (15-30 ml) of CLEAREX™ per gallon of water. Pour one to two quarts of solution per plant site with minimum 80-90% runoff.
Dump waste run-off and fertigate as usual or Add CLEAREX™ to pure water in reservoir without nutrients. Run system. Use 1/2 to one ounce (15-30 ml) of CLEAREX™ per gallon of water. Check EC or PPM in reservoir. Run system for 15-60 minutes or until EC or PPM stops rising. Dump reservoir. Add desired nutrient dosage and water, then adjust pH. Fertigate as usual.