Most hydro plants shown here are grown in a Sunny D bottle covered with black tape or any light blocking material. Use the handle to insert the air line and to add more water and nutrients later on. Keeping the project cheap is the main goal. In the back of our minds there must be a way to feed those in need. In Africa there is plenty of sun to grow food hydroponicly, think about it. You could build a tall sun-tower round in shape (so it does not cast a shadow upon itself)paint it white to reflect the heat from the sun, similar to the ones the shaolin, romans, muslims, and hindi people built, the exact opposite concept of a lightnouse. You wouldn't need much water growing quadraponicly. This tower could harness the sun of Africa and use it to grow amazing amounts of fruits, vegetables, and flowers.
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