I realy hope you will help me grow good healthed marijuana. Well First of all i wanna say i havent setup my growroom completly so there is still is some problems with ventilation. Problem is yellowing , they are babys , only one week they growing and they getting yellow. Lights are 125hps/mh 250hps and i want add 400hps. distance from lamps to plants is about 40cm. light are running 18/6. Tempereture , with 4 lamps i have 38c temp in plant area. simple ventilation sistem , one(big one) is for blowing on plants and one other side one which outputs the air. watering 2 times in day for about 50ml dont have added any vitamins becouse i dont know what i need. Soil i buy in shop special for Roses and added only perlite. what i need to do about that yellow plants? neutrents , tempereture ? Im Realy sorry i dont have pictures i will add as soon as possible i can. thanks.
yes , but how ? only way i can think about to solve this problem is: 1. lower lights now distance between light and plants are about 45cm i can lower till 60cm-70cm. But if i did lower , plants will not get lumens so much. 2. change lighting timer , so light will turn on in nights when is cold and turn off in day when is hot outside. 3. buy one more ventilator who blowing on plants or one who outputs the air. but what about vitamins neutrents what NPK i should use for start and when i need change to highter NPK ?