plant problems

[latewood]

plant problems
i will post the most commmon nute plant probs for anyone who wants to learn , this knowledge could save your crop one day.the postman






Heat Stress
Lookat pic 1, and you'll see the brown leaf edges that are indicative of heat stress. This damage looks alot like nutrient burn, except it occurs only at the tops of the plants closest to the lamps. There's only one cure for this...get the heat away from the plants, either by moving the lamps or moving the plants

Nutrient Solution Burn
look at pic2
There's a good chance that this plant was subjected to nutrient solution burn. These symptoms are seen when the EC concentration of hydroponic solutions is too high. These symptoms also appear when strong nutrient solution is splashed onto the leaves under hot HID lamps, causing the leaves to burn under the solution.


pic3
Many hydroponic gardeners see this problem. It's the beginning of nutriet burn. It indicates that the plants have all the nutrients they can possibly use, and there's a slight excess. Back off the concentration of the nutrient solution just a touch, and the problem should disappear. Note that if the plants never get any worse than this here, then the plants are probably just fine


Figure 4 is definitely an over-fert problem. The high level of nutrients accumulates in the leaves and causes them to dry out and burn up as shown here. You must flush with clear, clean water immediately to allow the roots to recover, and prevent further damage. Then find the cause of the high nutrient levels



Over Watering
The plants in pic 5 were on a continous drip system, where nutrient solution is constantly being pumped into the medium. This tends to keep the entire root system completely saturated. A better way would be to periodically feed the plants, say for 1/2 hour every 2-3 hours. This would give the roots a chance to get needed air to them, and prevent root rot and other problems.

Don't be throw off by the fact that the plants in Figure 2 are sitting in still water, this is actually an H2O2 solution used to try and correct the problem. Adding an airstone to the tub would also help add O2 to the solution. continued below.the postman

cgood job, postman
I have something to add about your rrestricting wtaer to allow oxygen more readily to the roots. It also causes the plants to work a little, imho

but, what I wanted to add , was that in my current hydro tray w/perlite modified nft/drip experiment. I was watering full on when the lights were on...progress was nice, but I was wondering at the time, if I cut the water more often during the lights-on photoperiod...if the plants would bulk-up? wel, I developed an intermittent drainage problem in one of the trays (running 4 now) so, I switched to 15 on and 15 off during lights on photoperiod, and I saw immediate results/bulking up the fruits of my labors.

so now, after reading your opinion; I am wondering if I
should further cut-back, if in fact production of bulk would further increase? this is right on the edge of opinions.

One more note...this also allows the pump and rez temps to cool off a bit. Just an observation!

good thread. lw