week 2 first grow!

Well this has been my first run so far, obviously still learning just figured id share anyway!

Week one I put the seedlings under a fluoro till both had there first sets of leaves. Other 2 didn't make it.


This is day 8 under my 900w LED


I may have messed up my proportioning of fox farm big grow nutrients.. this plant has some browning on the tips of the bottom layer of leaves.

are those spots on the leaves or just the lighting??

light reflection off some water :O

A couple things.

1.) FFOF has enough nutrients to last most plants 3-4 weeks without adding more food
2.) Try not to get water on your leaves when lights are on, it can act as a magnifying glass and can damage your plants.

In soil, the only thing I will feed during the first few weeks of veg is a little EWC tea, this is more to feed the soil than the plants themselves.

Looks like the dirt is saturated with water, that will kill the plant as good as a flame thrower if you keep it up and don't let that soil dry out.

Don't worry about water on the leaves it will not act like a magnifying glass.

NoDrama said:

Looks like the dirt is saturated with water, that will kill the plant as good as a flame thrower if you keep it up and don't let that soil dry out.

Don't worry about water on the leaves it will not act like a magnifying glass.

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Leaves are wet indicating he recently watered, but yeah make sure you are letting it dry out.

Yes, intense light can be magnified by water droplets on your leaves. Try to keep the water off your little leaves this early on, and you should consider a fan in there to get some movement on the leaves (I don't see on in the pics, but this will help strengthen the stems, help with cooling and prevent those droplets from staying stationary long enough to cause a problem).

hbbum said:

Yes, intense light can be magnified by water droplets on your leaves.

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You can test that hypothesis by experimenting.
Go get a real magnifying glass and try to burn a hole in one of your plant's leaves with the light you have.

I tried my darndest to get something to burn under 2400 watts of HPS, but all I got was a wasted 15 minutes of my time. And that is with an actual real magnifying glass placed at the perfect distance away to focus the light the best. I somehow doubt a water droplet right on the surface of the plant is going to do much except maybe leave some residue after it evaporates.

The Nazis figured out that if you tell the same incorrect information over and over, people will believe it, and they will defend it to the death even if proven wrong over and over again by science. That's how powerful an appeal to popularity/authority can be sometimes, but is one of the most common fallacies. Everyone has read that water drops can burn your plant, just like aluminum foil can reflect the light and do the same thing. Both are false.

Edit: Found some actual evidence rather than my anecdotal non peer reviewed method.
http://www.telegraph.co.uk/news/science/science-news/7823032/Sunburnt-plants-myth-is-debunked.html

Maybe you should read beyond the title of the article. They state that some leaf types can be burnt by droplets (these tests where done on actual leaves, not the computer simulations done to for the article title). Having experienced it in the past however, I do agree that it could actually be that the spotting on the leaves could be not necessarily for the magnification, but actually from the fertilizer in the water damaging the leaves.

Either way, to be safe its better to keep water off of your leaves, and with some fans in there, the water really wouldn't be able to stay on the leaves long enough to cause damage (chemical or otherwise).

hbbum said:

Maybe you should read beyond the title of the article. They state that some leaf types can be burnt by droplets (these tests where done on actual leaves, not the computer simulations done to for the article title). Having experienced it in the past however, I do agree that it could actually be that the spotting on the leaves could be not necessarily for the magnification, but actually from the fertilizer in the water damaging the leaves.

Either way, to be safe its better to keep water off of your leaves, and with some fans in there, the water really wouldn't be able to stay on the leaves long enough to cause damage (chemical or otherwise).

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Its a fact, water droplets will not burn your precious Marijuana plants by magnifying the light. You can argue this point til the cows come home, but you will always be wrong.

hbbum said:

Yes, intense light can be magnified by water droplets on your leaves.

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NoDrama said:

Its a fact, water droplets will not burn your precious Marijuana plants by magnifying the light. You can argue this point til the cows come home, but you will always be wrong.

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Beat me to it, ND.

Noobs helping noobs. What could possibly go wrong? Or better yet, will anything ever go right?! lol

From the images it appears your upper growth tips are green and only the tips touching your moist soil are dying. In my experience any leaf tips in contact with moist soil, or in my case soilless die. So I'd trim them and the rest appears fine.
hth,
Annie

spandy said:

Beat me to it, ND.

Noobs helping noobs. What could possibly go wrong? Or better yet, will anything ever go right?! lol

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Its not so much noobs, but people with such fragile Egos that they just cannot accept that they were wrong.

Hell I was tying my shoes wrong for over 50 years before I watched a TED talk where a guy explains the science of tying shoes.

You know that we will continue to see threads where people swear that water drops will burn their plants, and these people will never accept any other answer.

The older I get, the more I learn, and the more I learn the more I realize i don't know much, and many of the things I thought was right, were wrong. Like tying my shoes incorrectly for 50+ years.

Im terrible at tying knots, so I consider it luck that I was tying mine the right way all these years.

Appreciate all the feedback people