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The shallow and level pipe drain method with thickly spacing in lower paddy fields(µ) -Drainage effects of shallowed and leveled pipe drain¡Ý
KOSHIBA NOBUO [Chiba Prefectural Agriculture Reserch Center]
OKUYAMA TAIGA [Chiba Prefectual Agriculture Reserch Center]
ARIHARA KATSUYUKI [Chiba Prefectual Agriculture Reserch Center]
IWABUCHI YOSHIHIKO [Chiba Prefectual Agriculture and Forestry Promotion Center]
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