take a look getting some yellowing

6 pak purple kush first grow 3.5 weeks in ebb and flow was watering 3 times for 10 min now 2 for 10. what do you think fellas im useing general nutes and h2o2. i think i went a little heavy on the nutes before last water change like1050ppm now down to 920ppm. or is it mag, nitro def? thanks oh yea the light was 12'' from the tops 100w hps moved it up to 16 but my temps stay cool in the room and 79 deg on the table 85 at the tops of the plants.

or do you think take the nutes back to like 700ppm they are small plants.?

onefortheroad said:

6 pak purple kush first grow 3.5 weeks in ebb and flow was watering 3 times for 10 min now 2 for 10. what do you think fellas im useing general nutes and h2o2. i think i went a little heavy on the nutes before last water change like1050ppm now down to 920ppm. or is it mag, nitro def? thanks oh yea the light was 12'' from the tops 100w hps moved it up to 16 but my temps stay cool in the room and 79 deg on the table 85 at the tops of the plants.

Click to expand...

100 watt hps? You mean 1000 right?

Looks like the beginning stage of nute burn.

CLOSETGROWTH said:

100 watt hps? You mean 1000 right?

Looks like the beginning stage of nute burn.

Click to expand...

that's what i was thinking im going to knock it back to like 800's and yea 1000w.

Tib420 said:

did you flush your plants?

Click to expand...

how does one flush a hydro set up, other than changing the water?

id cut back on the nutes, maybe use plain water for a day or few and see how things look. less nutes wont hurt them but more will

Actually, if you are using GH nutes ("im useing general nutes") and you are in the middle of flowering, I think you are starving them. I believe you need to increase your ppm's. Make sure you are using the micro & bloom and not the grow. The micro will provide a good amont of nitrogen.

About a 2 years ago, I was following suggestions in here about keeping the ppms below 1000 and I always had a lot of premature yellowing in the flowering phase. Then, after reading several companies nute charts, I set up an excel sheet to anlyze the nutes I was using so I would know how many total ppms I would have from a given mix of several dif nutes. I increased my ppms and wah lah. Nice and green and very healthy. Now... in the middle of flowering, I am running at about 1440ppms. I avg about 6 - 8 oz (rock hard crystally bud) per plant with very little larf. However, I do use other nute supplements and I supercrop and de-larf my plants. This maximizes the lumens absorbtion and allows the upper buds to absorb all the nutes (instead of sharing with the larf).

Good luck... let us know how it goes.

BTW... I grow hydro in Rockwool.

They look fine,there just sucking up the N from the leaves.

i was reading a DWC post and the dude only used micro and bloom never grow. funny how you said that. gets me thinking

onefortheroad said:

that's what i was thinking im going to knock it back to like 800's and yea 1000w.

Click to expand...

Oh Yeah. And you have your lights (1k watts) too close. 1kwatt hps need to be about 20 to 30 inches away from the canopy. 16" is way to close. Heres a chart for comparison to the natural lighting (the sun).

JoeCa1i said:

They look fine,there just sucking up the N from the leaves.

Click to expand...

That's seems right. A bit more N is needed.