Geographical classification of Tohoku district [Japan] by relative grades of danger caused by sterility type of cool injury of rice plants

agentes nocivos agricultura de regadio arroz arroz irrigado asia asie cereales cereals chemicophysical properties cold cropping systems crops cultivos cultivos de grano economic plants environmental effects esterilidad facteur nuisible fisiologia fonction physiologique frio froid geografia geographie geography grain crops infertility injurious factors irrigated farming irrigated rice physiological functions physiologie physiology plantas plante plante de culture plants reproduction rice riz sistemas de cultivo