Faculty of Land and Food Systems;
the University of British Columbia;
344-2357 Main Mall;
Vancouver;
BC V6T 1Z4;
Canada;
Graduate School of Frontier Sciences;
the University of Tokyo;
5-1-5 Kashiwanoha;
Kashiwa;
Chiba 277-8563;
Japan;
system of rice intensification; conventional practices; organic and inorganic management; rice growth;