Since the dawn of history, agriculture has been oneof the important means of producing food for human consumption. Today more and more lands are being developed for the production of a large variety of crops. In Asia, vast areas of land are being used to produce rice, wheat, rubber and a variety of other crops. More than half of the lands occupied and developed by human beings in the worldare devoted to agriculture. That agriculture is one of the most essential meansof producing food is realised easily when we think of the types of things that we eat. The rice or wheat that we eat comes from the land. Even potatoes and other roots or vegetables and even leaves such as tea, as well as the fruits that men eat are the products ofthe soil that covers the earth.