A well maintained Greenhouse
The concept of Greenhouse is becoming popular nowadays, especially when there is a scarcity of good land and water for cultivation. Greenhouse can be developed with less capital, but depends up on the size of the area and the type of crops which are planned for cultivation. Lets say If you are planning to cultivate vegetables for personal needs, it may require less space and can fulfill basic family needs, but if you are planning for commercial purpose then the requirements will also go up, it all depends up on personal choice and interest.
During my recent visit to a farm house, I was much impressed the way the greenhouse concept was implemented to grow flowers, strawberries and different types of vegetables.