Strain; Type, Bag seed, or NA
Soil: ProMix BX (Straight from the bag)
Strain: Master Cush/Bag Seed
System Type: N/A
PH of runoff: 6.2 -6.5
Strength of Nutrient mix: TDS: 300- 310ppm
Indoor grow 6 plants in 4 x 4 tent
Light system: 1 Viparspectra 600w LED; 1 450w Viparspectra LED
Temps; Day, Night: Day 77-79 *F Night 71-75 *F
Humidity; Day, Night: Day 52%; Night 48%
Ventilation system; 6” 442 CFM Exhaust Fan + Carbon Filter; 240 CFM 6” Inline Duct Booster Fan; 14” & 6” Internal Tent fans.
AC, Humidifier, De-humidifier: N/A
Co2; N/A
My grow is on wk 4 of Flower. The last three watering’s were as follows: 600ppms going in @ 5.5 pH, and followed with 1.75L of 5.5 pH of water. The #6 plant’s return was approx. 2400ppms @ 6.5 pH. That pH came down to 6.0 on the return, and 1950 plus ppms on the return. The #2 plant had a return of 4200ppm and a pH of 6.2. It reduced to 3600ppm and a pH of 6.0 on the return. The 4 remaining were between 1100 and 1600ppm with and averaged 5.9 pH. The next watering was in 4 days and were given 300ppm of Neuts @ 5.5 pH followed with 1.75L of 5.5 pH water. #2 plant return was 3200ppm, and after an additional 1.75L of 5.5 pH water, the return was 2600 and going down. No sign of burn. Next watering was in 4 days, and all plants given 2 separate 1.75L of 300ppm neuts, and #6 plant was given and additional 1.75L of 5.5 pH water. Now as one would have expected, there is a slight tip burn noted on the plants. My question is: The burn is just limited to tips, otherwise all plants appear generally healthy. What would you suggest be the PPMs or EC of my next feeding? It will be in another 4 days or so. Depends on the plants of course…. But it will be right at mid 4th week of Flower. Here are a couple of pics!
I would stop feed them and just use ph water until ppm come down on ones that are running high ppm @Smilin the other sound like ppm are slightly lower then what you want you should be closer to 1800 ppm 4 weeks into flower
Happy growing CB
I agree they should be, but with signs of neut burn (the pic I put in there does not show it), on the tips (several tops). I am concerned about a more severe burn. If it were Coco, I would easily go for it, but I am not sure about doing it with a ProMix Medium, and have not used this medium enough to know for sure. Thanks for the reply…
I believe that if you do as John suggested your salt build-up will be reduced to a more benign level which should reduce nute burn. If your ppm doesn’t come down I would flush. FYI, hopefully you are taking your ppm data from the end of the runoff, not the beginning or the average.
Ok something is not making sense to me. I just watered one plant with 3.5L pH 5.5 water. The return was 898ppms runoff, PH was 6.2. (end of runoff). The plant is a thirsty one, and it’s ready for water (watered 2 days ago), (light bucket - one finger down dry). This is one of the plants that is showing slight tip burn, and for the last feeding, it was 600ppm on the neut mixture. @Countryboyjvd1971. The watering before was only 300ppms). I got roughly 15% runoff. The canopy is about 38." Isn’t the “Tip Burn” from too many neuts? If I gave it 1800ppms of neuts, or even close to that, from what I see, it would severely burn the plant?, wouldn’t it? (Temps-79 *F RH- 49%) Here are Pica from this plant tonight…
What I do is mix full @SmilinMill feed about a half gallon of mix to my plants and watch their reaction
I’ll adjust my feeding to more or less nutes but always mix full streagh using the ff trio And really only check my run off if I’m seeing a issue
And in you case if those where my numbers I would feed maybe a 1/4 gal of full strength nute mix to a 5 gal pot and finish with proper ph water recheck ppm and ph of run off so you know how to proceed next watering and or feeding
I would also say that it’s not uncommon to see slight discoloration of leaf tips. If it doesn’t go further it’s just not worth worrying about.
I ppm to 1,700 plus or minus and like John only take runoff data if I suspect something going on. Currently I’m watering every 4 days and they’re taking 4 gallons before runoff, so I know about thirsty lol!
@Countryboyjvd1971@Myfriendis410, The ppm on runoff is confusing to me. I use mostly organic nutes; I have only used something else for the emergency phosphorous issue I had to contend with. Am I correct in my understanding that organic nutes will not give my plant nute burn? Therefore, my low ppm runoff is reflective of the organic nutes and not a health issue with my plant?
Oh I’m sure you can overdo it with organic nutes. Think fresh chicken guano. Organic but like a flamethrower to your plant if handled poorly.
For me, ppm data is one piece of the whole. Taken over time it can yield some insight into problems that crop up and more easily give you a tool to diagnose what is happening.
Growing in soil in pots we will always have to contend with nutrient issues - whether toxic salts built up or leached out soil, it’s a difficult balancing act with these incredibly hungry plants.
I’m with @Myfriendis410 in that even with organic nutes you can still burn your plants if you feed and allow ppm to get high but it is harder to do with the organic stuff just not impossible @Tr33 @Smilin it’s best to water when lights come on or just before
And you shouldn’t water if less than 4 hrs of light left before lights out
The don’t take much water up at night this happens durning the day a stored used at night
Keeping pots wet for long periods will cause root rot FYI
@Tr33 I use only organic nutrients and have had issues with over feeding in the past so itnis possible to overfeed with organic nutes.
I’ve found with the nutrients I use that when ppms tend to be lower with the organic nutrients bit again I’ve noticed this with the nutes I use which are most likely different than what you are using.
Ok…I watered last night, and fed…
Here are the beginning returns:
Plant #1 Beginning: 1380ppm Ending: 2174ppm @ 5.8 pH
Plant #2 Beginning: 2045ppm Ending: 1345ppm @ 6.6pH
Plant #3 Fed previous night with 650ppm (1.3EC) @5.5pH and the tips of the plant were slightly burned to a minute degree, increased.
Plant #4 Beginning: 1329ppm Ending: 1168ppm @ 6.0 pH
Plant #5 Beginning: 1732ppm Ending: 1452ppm @ 6.1 pH
Plant #6 Beginning: 1074ppm Ending: 668 ppm @ 5.9 pH
I first gave 3.5L of plain pH’d water (pH-5.5) to each. The #2 plant I gave 5L the fed.
All were fed with 550ppm (1100 EC) of neuts. (I am feeding with mix of mostly Advanced Nutrients and Some House and Garden (Amino Acid) and Pro=Tekt (Silica). After reading the entries, I went back to my feeding plan, and my plan was to feed between 1100 and 1600 EC, (Which prior to decreasing the amounts as I listed in the beginning entry was between 1300 and 1600 EC, (1.1-1.6EC)-(650ppm-800ppm). I lowered the neuts to 550ppm (1.1EC), and the tip burn did not increase, and today the plants are all responding well at the beginning of their daylight time. The only thing I can think @Countryboyjvd1971, @Myfriendis410, is the difference between FF and AN PPM/EC amounts. PH in all plants was very acceptable, but this is day one after feeding. Thanks again for all the comments! (I considered everything that was stated).
They certainly look happy! Refresh my memory: this is a soil grow, right? So, low ph out on some plants which would be good to get up higher. FYI, I’m finding that adjusting the ph is temporary, so if your base water is 7.0 and you ph to 6.5 after nutes brought it down to 5.6 or so, you will see the ph drift to 7.0 over 24 hours.
The medium is ProMix BX. @Nug-Bug shared with me on my last grow that ProMix should be pH’d like Hydro. So, I followed his advice, and it has been beneficial. I am using Advanced Nutrients Connoisseur A&B (1st time) as my base neuts, and they have a pH perfect formula, and it seems to be working very well. I still pH my feedings to 5.5 when I give them, and I have not had any returns that are over 6.5. (I was told by AN I did not need to do this, but I did not want to experiment on this grow with too many variables, and my feeding regimen has 2 Base parts, and 10 supplements. The pH perfect is supposed to be good for 1 wk. So far, I have not had any issues with pH, and the plants look healthy. Tonight they look good, and the slight tip burn will be there for the rest of the grow, but they are all looking good. They look pretty much the same as yesterday’s pics, so I will wait a few days then post another for comparison. Thanks for the advice! I always read the replies, and use that input in making decisions…
CB 
