Grow Lettuce On Your Rooftop Using Simplified Hydroponics by Pritham 'metal farmer' D'Souzafollowing are some very simple steps i took in creating my very own floating bed where i used it to grow lettuce.
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the above pic shows lettuce seedlings germinated in seedling tray. i had to wait for a few days till they were a few inches tall before i could transplant them in my floating bed
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i took a normal dishwashing sponge as seen above and cut it into square blocks measuring about 1 inch as seen below.
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on each sponge block obtained i made a deep incision as seen above, at the middle
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i took a normal thermacol sheet & made holes in them using a bottle cap.
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since my carpentary skills are not as good as my guitar playing skills, i decided to use one of my normal grow bed tubs & convert the same into a floating bed (sorry peggy)
i covered the base, and the sides using black polythene sheet & taped the sides as seen above. then i filled it with already prepared nutrient water
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i wet the seedling tray, and slowly picked up the lettuce seedlings as seen above & placed them gently in between the cut i had made on the sponge piece as seen below
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notice the good root development above n the enlarged image below
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another side view of the seedling placed in between the cut on the sponge block
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notice the pic above has very small roots. i was not careful while removing the seedlings from the germinating tray, and as a result a lot of the roots here snapped. but i transplanted it anyways to see if it will survive
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i plugged all the 12 holes with the seedlings & if you notice, at the bottom left, i transplanted a tomato seedling just for kicks!
the above photos were taken on march 5, 2009
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just a day later, on march 6, 2009, i noticed, the roots slowly begining to look a lot healthier & the plants looking a lot stronger
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i aerate the water everyday , twice with my hands & the bubbles thus formed help the roots get oxygen. it also eliminates mosquitoes from breeding as they prefer stagnant water, not daily aerated water.
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the above pic was clicked on march 5, 2009, just 2 days after i transplanted. if one compares the photos, it is very clear, there has been rapid increase in length of the leaves and the plants look a lot greener.
i will post newer photos after a few weeks & see the development of my lettuce floating bed
all photos n data by Pritham dsouza