Indoor growing problems - experianced help needed

farmhouse said:

Hi, I have read this websites useful information from time to time and found it rather helpful but need some further assistance. I have used the faq and other threads but need some specific help in identifying my plant problems.

My setup:
Indoor - 1.2sq.m. & 0.6cub.m.
600 HPS @ 90cm
18/6
about 8-10 weeks (but no lights for first 2/3 weeks)
12 plants (for time being)
seeds: unknown
pots= 4.5L(200mm)
plants about 30cm tall
potting mix soil
Watered when the top 1" of soil is crusty
ph meter says about 5.5-7
fan replaces air in closet numerous times a minute.

Last week they came out of 2L pots into current 4.5L pots - (small i know but i have limited space and too many plants.

Just started nutrients last week, not sure of the ppm, but using 1/3 of recommended dose=1ml/L.

These plants are the worst, but all have similar problems to a lesser degree. They showed these problem before the nutrients and transplanting, but not as extreme.

Any experienced help would be appreciated.

When growing in soil your ph must be hovering right at 6.5. This is the first thing you should get right on. As long as the ph sits below 6.5 your plants cannot utilize the nutirents they need thus causing lock out of some nutrients and an overdose of others.

farmhouse said:

I add nutrients every second time i water, and water every 2-3 days.

The potting mix i bought claims to have water holding properties and large chips for air.

thanks for the link, but i am still not confident in concluding that it sounds like a N or Mg problem as i am often told it is a lot simpler than that.

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Using soil with water holding properties can cause overwatering issues. When using this type of soil you can go sometimes up to 7-8 days without watering again. Lift the pot to check the weight, if it is light it needs water if any weight to it then it is fine and needs no water yet.

Also, another big problem is how much you are feeding them and the ph. With low ph they can't eat good so the amount of food they are consistantly getting is building up. They do well with a water, water, light feeeding type of schedule.

The way to fix these issues is to first flush the hell out of your soil with plain water ph'd to 6.5. This cleans the soil of salt build up, nutirent build up, and balances the ph. Then after the flush and on their next feeding feed them a 1/4 dose of grow nutes to bring them back around. Make sure to ph your feeding solution to 6.5 before giving to the plants.

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