hi.
I'm new to the forum, been reading around a lot and still need to ask. sorry for repeating a question asked so many times. i really could not find a definitive answer anywhere...
this is my second grow and on my first i had done every mistake possible. i am hoping that the second time would be better. A description of my setup:
400W HPS (son-t agro bulb - for added bleu spectrum) in cool tube connected to the exhaust fan (189 m3 an hour) with active carbon filter sucking air from top of room directly out via the buildings ventilation shaft. fresh outside air intake with a 99m3/hour blower and a same size intake without a blower also coming from inside the house. also a oscillating fan blowing across the plants. the strain is AK-48 grown from seeds (sensi seeds). the grow medium is regular potting soil, seedling soil and expanded clay mixed at 50-40-10% ratio. the pots are 10 liter buckets 1 per plant (new) with holes drilled on the bottom for drainage. the plants where placed in these buckets as sprouted seeds.
they are now 13 days from popping up from the soil. temps have been somewhat high. day time has been mostly around 28-32C / 82-89F now it's steady at 28-30C / 82-86F and at night 2-3 degrees colder. humidity was at the first week very high around 75-80% but has dropped down to 60% last week. this has to do with high and humid outside temps and i can't really do much about it but wait for colder weather.
the light is 51cm / 1.6 foot from the top of the plants. no fert given yet. i measure the soil moisture using a stick meter and water only when mid to almost dry with tap water that has been standing to evaporate the chlorine. they have been growing very nicely and seemed healthy until i spotted a yellow spot on the center-front of one plant 2 days ago. i did not think much of it untill today i notices other spots on the edges of 4 other plants. the spots are not always on the top leaves and and some are on the edge and others are in the center-front of the leaf. here are some pics:
View attachment 1717147View attachment 1717148View attachment 1717149View attachment 1717150
so, what do you guys say? nutrient deficiency? too close to light? too hot? it's hard for me to diagnose because they are still growing very nicely and fast. but something is wrong and i better catch on to it before it becomes a problem... any help would be appreciated. thanks.
I'm new to the forum, been reading around a lot and still need to ask. sorry for repeating a question asked so many times. i really could not find a definitive answer anywhere...
this is my second grow and on my first i had done every mistake possible. i am hoping that the second time would be better. A description of my setup:
400W HPS (son-t agro bulb - for added bleu spectrum) in cool tube connected to the exhaust fan (189 m3 an hour) with active carbon filter sucking air from top of room directly out via the buildings ventilation shaft. fresh outside air intake with a 99m3/hour blower and a same size intake without a blower also coming from inside the house. also a oscillating fan blowing across the plants. the strain is AK-48 grown from seeds (sensi seeds). the grow medium is regular potting soil, seedling soil and expanded clay mixed at 50-40-10% ratio. the pots are 10 liter buckets 1 per plant (new) with holes drilled on the bottom for drainage. the plants where placed in these buckets as sprouted seeds.
they are now 13 days from popping up from the soil. temps have been somewhat high. day time has been mostly around 28-32C / 82-89F now it's steady at 28-30C / 82-86F and at night 2-3 degrees colder. humidity was at the first week very high around 75-80% but has dropped down to 60% last week. this has to do with high and humid outside temps and i can't really do much about it but wait for colder weather.
the light is 51cm / 1.6 foot from the top of the plants. no fert given yet. i measure the soil moisture using a stick meter and water only when mid to almost dry with tap water that has been standing to evaporate the chlorine. they have been growing very nicely and seemed healthy until i spotted a yellow spot on the center-front of one plant 2 days ago. i did not think much of it untill today i notices other spots on the edges of 4 other plants. the spots are not always on the top leaves and and some are on the edge and others are in the center-front of the leaf. here are some pics:
View attachment 1717147View attachment 1717148View attachment 1717149View attachment 1717150
so, what do you guys say? nutrient deficiency? too close to light? too hot? it's hard for me to diagnose because they are still growing very nicely and fast. but something is wrong and i better catch on to it before it becomes a problem... any help would be appreciated. thanks.
