With the agrotechnique of tillless

ridge and covering culture in arid farming field

the rice can become exempt from irrigation and yield well. Through this cultivation technique

a good soil structure can be formed and maitained. So that a great deal of natural precipitation can be efficiently conserved and utilized

which prevents loss of water and ero sion of soil. It is showed that this farming technique is available in irrigation of dry farmland and transformation of du alpurpose field

so as to save water

manure and labour.