Can i fertilize almost at the end of photoperiod? - The Planted Tank Forum
 
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post #1 of 7 (permalink) Old 12-05-2013, 04:13 PM Thread Starter
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Can i fertilize almost at the end of photoperiod?

Hi all,

as the question says, due to my late night arrival at home (22pm), i wanted to give the photoperiod a start from 18pm to 2am,

My tank is on a very shady area of my house, beneath the stairs, so the light from sun shouldnt be a problem,

The real issue is if fertilizing the EI method at 22:30pm, is any problem being 4:30 hours after period starting?

My thoughts are that plants dont use the nutrients all at once, so giving stable values would make no problem as the previous day nutrients are still present when i dose again,

Am i right?

cheers


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post #2 of 7 (permalink) Old 12-05-2013, 05:23 PM
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normally NPK can be dosed at any time of the day/night, i would avoid adding Iron during night time, iron doesn't last in the water for long time and can be useful when plants are up taking the nutrients during the lights are on, Traces can also be dosed any time of the day/night.

however it is also true plant still uptake nutrients when the lights are off, they can reserve most of the nutrients for later use when the light turns on. another thing to consider is what kind of iron Chelate is being used, EDTA, DTPA, HEEDTA etc all act differently when added to the water, some last in the water for few hours and some for more than a day.

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post #3 of 7 (permalink) Old 12-06-2013, 02:03 PM Thread Starter
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So adding ferts, specially iron during lights but on the middle of the period shoundt pose any problem?

Other thing is, how to determine if sunlight is weak enough?
I think the only means should be testing but a pretty shady area with no direct sunlight should not pose a problem right?

Tank is beneath stairs, concrete stairs and the light comes from a big window 4 meters away with a wall hidding it,
I ask this since the photoperiod will be during night and the effective night tine is during day lol
6pm to 2am


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post #4 of 7 (permalink) Old 12-06-2013, 03:55 PM
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Adding the fertilizers at a less than optimum time will have a very minor effect, and you can just slightly increase the dosages if you think that is a problem. Fertilizing isn't an exact science - there is a pretty broad range of dosages that will work fine, especially if you do regular water changes.

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post #5 of 7 (permalink) Old 12-06-2013, 09:55 PM Thread Starter
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Then im more tranquilized about this

thank you for the help!

About the sunlight thing, any input?


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post #6 of 7 (permalink) Old 12-07-2013, 03:22 AM
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Not a problem with a little light such as you are describing.

Ferts: the best timing is the one that works for you.
Fighting to do it at some odd time that does not suit your schedule is likely to result in missed doses, up and down levels... a sure trigger for algae.
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post #7 of 7 (permalink) Old 12-11-2013, 04:11 PM Thread Starter
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Glad to hear that
so if i could dose sometimes at 8pm, and others at 22:30 pm, there shoudnt really be any diference right?

the 22:30 pm dosing time was for the latest hour that im at home, but most days i could dose at 8pm, closer to the start of the period,

Just wanted to clear that out of my mind


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