Yield response of indica and tropical japonica genotypes to soil fertility conditions under rainfed uplands in northern Laos - Asai, Hidetoshi; Saito, Kazuki; Samson, Benjamin; Songyikhangsuthor, Khamdok; Homma, Koki; Shiraiwa, Tatsuhiko; Kiyono, Yoshiyuki; Inoue, Yoshio; Horie, Takeshi (Elsevier, 2009)