| 摘要 |
PROBLEM TO BE SOLVED: To provide a rice cropping farm field enabling the laborsaving, saving water and improving the farm working environment and capable of having good harvests and a stable cultivation in a well-drained paddy field by laying underground a porous pipe as the irrigation pipe. SOLUTION: The porous pipe 1 molded from plastics such as polyvinyl chloride, polyethylene, etc., or rubber or their composite material, having 1×10<-8> to 1.5×10<-5> cm/s of coefficient of permeability is laid underground as the irrigation pipe. The paddy rice species are cultured preferably by supplying water, air, fertilizer, etc., to the soil from the porous pipe 1 laid underground in the paddy field.
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