yellowing veins

Hello every one , This is my third grow and this is the third time this has happened. The veins of the leaves are turning yellow and then the leaves turn light green then yellow but do not fall off by them selves. They are on day 55 and are auto flower. I'm feeding them 1 3/4 tsp big bloom, 1/2 tsp big grow 1 3/4 tsp tiger bloom and 1/2 tsp microbe brew ( all are fox farm fertilizer) every other watering and ph water of about 7. I do add ph up or down to adjust the ph . The ppm of om water is about 300 before I add anything .The leaves were dark green before the veins turned yellow . So my question is why are the veins of the leaves turning yellow and then the leaves slowly turn light green to yellow? I've done lots of research and fond no exact answer . If there is anything I'm leaving out please ask. FYI my plants are defiantly crowded. I know this. and will do it differently next time.

Thanks J

It looks like low N. I'm not familiar with your nutes or with auto-flower strains, but I'd give it more N to see if that stops further yellowing.

Edit: I didn't notice the curled down tips. What kind of growing media? What is the EC (or PPM) and pH of your nutes? Also, what is the drainage pH and EC?

simpleleaf said:

It looks like low N. I'm not familiar with your nutes or with auto-flower strains, but I'd give it more N to see if that stops further yellowing.

Edit: I didn't notice the curled down tips. What kind of growing media? What is the EC (or PPM) and pH of your nutes? Also, what is the drainage pH and EC?

Click to expand...

It’s darned sure not nitrogen deficiency. Look at the other leaves. Color. Probably overwatering.

iron lock out from too much ferts

simpleleaf said:

It looks like low N. I'm not familiar with your nutes or with auto-flower strains, but I'd give it more N to see if that stops further yellowing.

Edit: I didn't notice the curled down tips. What kind of growing media? What is the EC (or PPM) and pH of your nutes? Also, what is the drainage pH and EC?

Click to expand...

The fertilizer solution is a ph of 7.01 and 994 ppm but that's including tap water of 200- 250 ppm. The drainage is 6.35 ph and 1250 ppm

jdr00 said:

The fertilizer solution is a ph of 7.01 and 994 ppm but that's including tap water of 200- 250 ppm. The drainage is 6.35 ph and 1250 ppm

Click to expand...

Thanks. EC is often equal to PPM x 2 (I believe there are 3 different conversion factors that are used). Without CO2, 2000 microsiemens/cm (same as 2.0 millisiemens/cm) is said the upper limit, so that's 1000 PPM. Personally, when my drainage EC exceeds that, I figure it's time to use pH'd water to lower it back down.

Also, you didn't say, or I missed, whether you said you were using potting mix. I'll presume that's the case. The fertilizer solution may be a little high on the pH, 6.7 or 6.8 is my upper limit. Your drainage pH is okay. For veg, it's lower, 6.3 or thereabouts. 6.5 is okay for both. With hydroponics (which I have not tried for many years), optimum pH levels are said lower, I believe 5.8 to 6.2.

Manganese loses availability at pH values over 7.5 or thereabouts, and it's on the decrease at 7.0.

hotrodharley said:

It’s darned sure not nitrogen deficiency. Look at the other leaves. Color. Probably overwatering.

Click to expand...

I might have over watered it when it was growing into its pot. But i cant imagine that I'm over watering it now. I wait for the soil dry out almost completely before watering it. Unless I'm giving it to much water at one time. Is that possible ?

simpleleaf said:

Thanks. EC is often equal to PPM x 2 (I believe there are 3 different conversion factors that are used). Without CO2, 2000 microsiemens/cm (same as 2.0 millisiemens/cm) is said the upper limit, so that's 1000 PPM. Personally, when my drainage EC exceeds that, I figure it's time to use pH'd water to lower it back down.

Also, you didn't say, or I missed, whether you said you were using potting mix. I'll presume that's the case. The fertilizer solution is a little high on the pH, 6.7 or 6.8 is my upper limit. For veg, it's lower, 6.3 or thereabouts. 6.5 is okay for both. With hydroponics (which I have not tried for many years), optimum pH levels are said lower, I believe 5.8 to 6.2.

Manganese loses availability at pH values over 7.5 or thereabouts, and it's on the decrease at 7.0.

Click to expand...

I'm using fox farm ocean forest potting soil with about 25% perlite

jdr00 said:

I'm using fox farm ocean forest potting soil with about 25% perlite

Click to expand...

Your drainage pH was fine, I edited my above post after you started writing your reply.

Your nutes are too strong.

simpleleaf said:

Your drainage pH was fine, I edited my above post after you started writing your reply.

Your nutes are too strong.

Click to expand...

Really, my nutrients are to strong. I thought cutting the nutes in half that it wouldn't be to much. I guess I was wrong.

jdr00 said:

Really, my nutrients are to strong. I thought cutting the nutes in half that it wouldn't be to much. I guess I was wrong.

Click to expand...

What should the ppm of the nutes be at this stage in its development for a auto flower ?

jdr00 said:

Really, my nutrients are to strong. I thought cutting the nutes in half that it wouldn't be to much. I guess I was wrong.

Click to expand...

You have the tools to measure it, so might as well! You might find this EC chart useful.

jdr00 said:

What should the ppm of the nutes be at this stage in its development for a auto flower ?

Click to expand...

There are various strategies, and there's a balancing act to keep salts from building up in the potting mix. Use your tools and keep measuring and refining. In my own potting mix grows I'm finding I don't want anything above 1300 µS/cm or so because of salt build up in the pot, which can be somewhat measured from the drainage EC. Ultimately you have to watch your plant after you make changes to its care, and be ready to back off if something you changed has a negative effect.

simpleleaf said:

You have the tools to measure it, so might as well! You might find this EC chart useful.



There are various strategies, and there's a balancing act to keep salts from building up in the potting mix. Use your tools and keep measuring and refining. In my own potting mix grows I'm finding I don't want anything above 1300 µS/cm or so because of salt build up in the pot, which can be somewhat measured from the drainage EC. Ultimately you have to watch your plant after you make changes to its care, and be ready to back off if something you changed has a negative effect.

EC Water Issues Explained - Watering Cannabis Plants

EC in Water - Explained in a simple way so that you can finally understand what EC is and why it's so important for growing cannabis.

www.growbarato.net

Goodbye from Maximum Yield

In print and online, Maximum Yield is your source for cannabis and cultivation knowledge, with informative grow articles and tips to enhance your life with mmj.

www.maximumyield.com

The ideal ec range for cannabis plants - CannaConnection

EC stands for 'Electrical Conductivity' and is a measurement scale for the concentration of chemicals in your nutrient solution. More at CannaConnection!

www.cannaconnection.com

Click to expand...

Thank you!

simpleleaf said:

You have the tools to measure it, so might as well! You might find this EC chart useful.



There are various strategies, and there's a balancing act to keep salts from building up in the potting mix. Use your tools and keep measuring and refining. In my own potting mix grows I'm finding I don't want anything above 1300 µS/cm or so because of salt build up in the pot, which can be somewhat measured from the drainage EC. Ultimately you have to watch your plant after you make changes to its care, and be ready to back off if something you changed has a negative effect.

EC Water Issues Explained - Watering Cannabis Plants

EC in Water - Explained in a simple way so that you can finally understand what EC is and why it's so important for growing cannabis.

www.growbarato.net

Goodbye from Maximum Yield

In print and online, Maximum Yield is your source for cannabis and cultivation knowledge, with informative grow articles and tips to enhance your life with mmj.

www.maximumyield.com

The ideal ec range for cannabis plants - CannaConnection

EC stands for 'Electrical Conductivity' and is a measurement scale for the concentration of chemicals in your nutrient solution. More at CannaConnection!

www.cannaconnection.com

Click to expand...

Are the ppms in my water to high 200-330 ppm

jdr00 said:

Are the ppms in my water to high 200-330 ppm

Click to expand...

I guess that is subtracted from the total salts that can be added to the nutrients. If you had RO water, you could add a few more concentrated nutes to it for the same EC.

I use RO water of about 60 PPM, but I don't think it's essential. It does work good for flushes.

simpleleaf said:

I guess that is subtracted from the total salts that can be added to the nutrients. If you had RO water, you could add a few more concentrated nutes to it for the same EC.

I use RO water of about 60 PPM, but I don't think it's essential. It does work good for flushes.

Click to expand...

It's additive. If you want 600ppm feed and your water is 200ppm then you'd want your feed total to be 800ppm. I'd suggest getting an RO filter if your water is that high ppm though.

should I flush the plant to remove excess nutes? If so what should the ph be?

editing- The yellowing has spread to the sugar leaves. It seems like the growth of the bud has slowed also. it probably to late to fix this. But id like to know for the future . any help would be appreciated.

jdr00 said:

Are the ppms in my water to high 200-330 ppm

Click to expand...

There are some nutrients specifically designed for high PPM water. I've been using the GH Flora Trio series but have switched over to the Trio Micro Hardwater...and it does make a difference. It's specifically for water that's 200ppm or more.

what should I do about harvesting it? I'm afraid if I wait any longer the sugar leaves turn brown and not having any bud. I know its not ready yet but if I harvested now at least ill have something.