%A OKUMURA, T. %T Rice production in unfertilized paddy field-Mechanism of grain production as estimated from nitrogen economy- %J Plant Prod. Sci. %0 Journal Article %@ %I %D 2002 %8 2002 %V 5 %N %P 83-88 %U http://ci.nii.ac.jp/naid/10021058049/ %R