I am new to the growing seen I have a 1.5m by 1.5 m ten with 2 300w 5w led grow lights large size co2 bag 4" exstracter fan with carbon filter attached and 2 desk fans. 2 of my plants was going fine started them on neuts at 1/4 advised on week 2 but another plant was tiny in size to the others. Since then the tiny plant has started yellowing leaves and one of the others is curling leaves I read a sign to heat stress but my tent sits at 22 c 50-60 rh and the led lights both Mars hydro are sat 25" from the plants I will provide pictures from 3 of the plants one tiny one healthy and one curling leaves. Help and advice would help alot. One to not I added a very small amount of chicken manure pellets a week ago after noticing tge change thanks. Also they are bedded in Coco and perlite with a layer of pebbles half way down the fabric pots and at the bottom for air to the roots
You need to feed. Coco nor perilite has any nutes available naturally, so you have to give your plants absolutely everything she needs. I really don't know that the manure pellets is something I would use in a soilless medium hydroponic system. I think that is something more useful in an organic or TLO soil grow. There are some somewhat weird interactions with Ca and coco, the coco will bind up lots of Ca, so keep an I on that. Also, never give coco just plain water, always at least put some Ca/Mg if you are not adding other nutes or sups. I am assuming you have a pH pen and are adjusting all your feeds/waters. As a new grower, you need to get a grasp on what pH is and how it effects your grow. There is alot of info on this and pay close attention to any special notes about coco. What nute line are you using? An EC/PPM meter is also a needed item. Instead of using the 1/4-1/2 strength rule, which in my experience gives very high ppm concentrations, you control the ppm and not only prevent problems like salt buildup, pH drops, nute burn, and several other interrelated problems, but you save on nute costs. Feel free to PM me if you have questions you don't want to ask in open forum, I will help where I can.
