Hi
There is an old saying "necessity is the mother of all invention"
Here are some examples of vegetable cultivation where water or land is a scares resource and the ways found to be the best to cultivate food right next to their cooking spaces. Personally I think the keyhole method is ingenious and the hydroponics system when copied can be useful in many places.
Keyhole Garden
A Keyhole Garden is a type of kitchen garden that recycles as it grows!
It looks like a keyhole from above with a central basket where compostable waste is placed and water is poured. These keyhole gardens are used in some African countries where it is very dry and hot. They are especially useful where the soil is poor. Water saved from the washing up is tipped into the basket. This then drains through the central basket taking the nutrients with it. The plants are fed from below instead of watering onto the surface where all the water would quickly evaporate

- African_Gardens_Lesotho_keyhole_garden_above-500x375.jpg (84.71 KiB) Viewed 4875 times
Some youtube videos describing the process step by step. the constructions can be adapted to include locally sourced materials. The first one is from Bangladesh including small bamboo trellis fro growing vines. The second is from Uganda showing how little material is required and the construction in step formats.
http://www.youtube.com/watch?v=ktg9Z1tGGcI
http://www.youtube.com/watch?v=ykCXfjzfaco
Advanced Hydroponic Rooftop vegetable gardening supplying a large restaurant in New York, no soil is used and the vegetables grow a lot faster than normal
http://www.youtube.com/watch?v=W5tnHfikb64
Growing in a bag like this to increase the planting area four fold so in essence from 4 feet planting area to 12 square feet.
http://www.youtube.com/watch?v=W5tnHfikb64

- A genuine smile and a very big bag of onions, 24 in fact
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When the technology is cleaned polished and represented it is called a Phytopod
http://www.youtube.com/watch?v=zIVJj_ya ... ZgDtq9x2gA the Americans apparently love them for their apartment style gardening claiming to get 20 square feet from 4. these examples cost around $65 dollars ....phew (I think the African girls have got it sussed right)
Im not advocating that you should follow these suggestions but they are some ideas to start the thinking process "out of the box" for our members with small cultivation spaces. There are also similar ideas for cultivation involving recycled plastic drinks bottles.
Regards
Ifzal