Soil material classification for paddy soils in Japan

摘要: Abstract In view of the importance soil material characteristics in determining paddy capability, a method classification for materials was proposed. working out special attention paid to making it practically applicable, need is great such ready practical applicability especially alluvial areas which most Japanese soils occur. An X-ray fluorescence spectrographic total chemical analysis proved satisfactory routine use terms accuracy and time. Nine major elements (Si, Fe, Al, Ca, Mg, Mn, Ti, K, P) were analyzed they taken represent nature material. The composition combined with mechanical subjected data processing. To avoid redundancy information, 2 mutually independent principal components extracted, appear different aspects features. From component sc...