Greens on floating raft under LED-light

Finally I've received my order consisting of LED bulb. This is how LED bulb with red and blue diodes and 15W power looks like:

Wasting no time I prepared my self-made floating raft hydroponic system and filled it with fertilizing solution same amount and concentration as I described in my previous post. For this experiment I used basil and lettuce plants which grew in turf on my window sill.

After washing roots carefully I replanted basil and lettuce plants into pots filled with clay and installed them into hydroponic setup. After that I hanged LED-bulb above plants and switched it on.

Now I'll watch how my plants will develop. I hope that this experiment will be successful!

Lettuce on floating raft

I didn't write for a while because of massive amount of work and health problems. Therefore this time I'll briefly describe my experiment of growing lettuce hydroponically in floating raft system, also its results and conclusions.
3 days after planting lettuce seeds germinated. At this point I realized my first mistake. Every "How-to germinate lettuce seeds" manual I've read advised to water turf first and plant seeds afterwards. In a hurry I did it in wrong sequence - at first planted seeds and watered them afterwards. As a result in few cells I washed seeds too deep and they didn't germinate, in few other cells they moved and germinated too close to a wall of a cell.

I took a cover off my mini-greenhouse and left my lettuce sprouts to grow on a window sill under sunlight. They grew well. This is how they looked after a week:

In about two weeks lettuce sprouts grew big enough to be replanted into my hydroponic setup.

I put my floating raft hydroponic system near a window, turned its aerator on and filled tank with solution. I used Vito 1 liquid fertilizer dissolved in water in recommended proportions for this experiment. I had to adjust acidity of solution by adding a bit of vinegar to lower pH level above 6.

After filling approximately 20 l of solution into a tank I put a foam rubber raft on a surface.

Then I started replanting lettuce sprouts to clay. I took them very carefully out of turf and washed roots under running water.

Holding lettuce sprout above a pot so that its root hangs inside I carefully filled clay.

At this step I realized my second mistake. Clay granules were too big for such a little sprout. It was very hard to make lettuce sprout maintain vertical position. Next time I will use smaller granules.
As I finished replanting pots with lettuce sprouts were installed into floating raft hydroponic system.

Next weeks brought me problems. First of all - direct sunlight reached my sprouts through a window just till noon. Another half of a day they received reflected light only. Second problem started day after I replanted sprouts into clay. Sky became very cloudy and long raining period started. The sun was very rare guest whole next month and sprouts desperately lacked sunlight. In a week they grew just a tiny bit.

Whole next month was cloudy and rainy. This is how my lettuce looked like by the end of it:

One plant died and was thrown out. Others were very weak. Leafs were very pale, thin and brittle. Instead of growing upwards they just lied on raft.
I concluded that my experiment failed. It became obvious for me that I never should rely on natural factors while growing in artificial circumstances. Next experiments are pointless without artificial light. I ordered led-lamp with 36 blue and 90 red diodes and 15W overall power. Next experiment will take place after I receive my order. I believe that light will bring me success.

Lettuce germination

After long break I returned to experiments with hydroponics. This time I am growing lettuce. Like basil lettuce is easy to grow and not demanding. For me as a beginner it is quite important option. I want to grow 3 different breeds of lettuce at the same time - 'Pirat', 'Salad Bowl' and 'May Queen'.

For this purpose I've purchased mini-greenhouse.

After filling plastic cells with turf I planted few seeds in each.

http://hydroponeast.com is advising to water substrate well and feed seeds with low concentration fertilizer from the beginning. I mixed solution with half of recommended concentration. I used Vito 1 liquid fertilizer for this purpose. Recommended pH level for lettuce is 2,8-6,1. PH test of my solution in substrate showed approximately 5,5 which I considered to be good.
After watering substrate I put cells into mini-greenhouse and left it in a room with good air circulation and temperature about 18 degrees by Celsius.

In theory sprouts should germinate in nearest 3 days. After that they're supposed to be taken out of mini-greenhouse and put under good light for one week. When sprouts grow bigger I will replant them into floating raft system. I'm going to describe how it's built in my next post.

2nd experiment - basil germination

This time following Zachary Jones advice I decided to germinate a plant which is easier to grow hydroponically - basil. Besides I decided to germinate seeds on turf. I was in need of special baskets for this purpose. I've seen them on foreign websites but didn't find anything alike in my city. I made decision to make  baskets by myself by cutting holes in paper coffee cups.

I learned from mistakes of my first experiment that pH level of substrate should be checked before planting seeds. Test showed pH level about 6 which is optimal for basil.

After filling cups with turf I planted seeds about 1 cm deep. I planted sweet basil Holy in 2 cups and Thai in another two.

I put cups into container and watered them well with warm water. In materials on growing basil which I have read it was mentioned that few days after planting seeds fertilizer shouldn't be used. Recommended water temperature - 22-24°С.

I placed container with cups into self-made growhouse described in one of my earlier posts. Recommended temperature for basil germination is 22-24°С but recommended air humidity 93-95%. Thermometer inside growhouse shows 22°С. I am worried about air humidity. Right now I don't have any tools to check it or keep at constant level. I decided to use a bottle with sprayer. I will spray water inside my growhouse few times every day. Now I have to wait few days for my seeds to germinate. Then I will move seedlings to window sill to continue growing under sunlight.