[Study on the fixation of limitating indice for adjusting water field by the tractor "Chollima"]
Jang Sung Chon | Ho Song Sik [Kye Uung Sang University Sariwon (Democratic People's Republic of Korea)]
We fixed the limitation for adjusting water field as 25-30cm by tractor "Chollima" in the adjustment of the field in plain area and established the rational building method. The influencing relation of main factors on the working efficency of the adjustement of the water field was analysed and the establishment of indice for the design and building work was rationalized
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